RubyGems versions between 2.0.0 and 2.6.13 are vulnerable to a possible remote code execution vulnerability. YAML deserialization of gem specifications can bypass class white lists. Specially crafted serialized objects can possibly be used to escalate to remote code execution.

The remote Redhat Enterprise Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0585 advisory.

    Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text     files and to perform system management tasks.

    The following packages have been upgraded to a later upstream version: rh-ruby23-ruby (2.3.6), rh-     ruby23-rubygems (2.5.2.2), rh-ruby23-rubygem-json (1.8.3.1), rh-ruby23-rubygem-minitest (5.8.5), rh-     ruby23-rubygem-psych (2.1.0.1). (BZ#1549649)

    Security Fix(es):

    * ruby: Command injection vulnerability in Net::FTP (CVE-2017-17405)

    * ruby: Buffer underrun vulnerability in Kernel.sprintf (CVE-2017-0898)

    * rubygems: Arbitrary file overwrite due to incorrect validation of specification name (CVE-2017-0901)

    * rubygems: DNS hijacking vulnerability (CVE-2017-0902)

    * rubygems: Unsafe object deserialization through YAML formatted gem specifications (CVE-2017-0903)

    * ruby: Escape sequence injection vulnerability in the Basic authentication of WEBrick (CVE-2017-10784)

    * ruby: Buffer underrun in OpenSSL ASN1 decode (CVE-2017-14033)

    * rubygems: Escape sequence in the summary field of gemspec (CVE-2017-0899)

    * rubygems: No size limit in summary length of gem spec (CVE-2017-0900)

    * ruby: Arbitrary heap exposure during a JSON.generate call (CVE-2017-14064)

    * ruby: Command injection in lib/resolv.rb:lazy_initialize() allows arbitrary code execution     (CVE-2017-17790)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2017:3485 advisory.

  - ruby: Buffer underrun vulnerability in Kernel.sprintf (CVE-2017-0898)

  - rubygems: Escape sequence in the summary field of gemspec (CVE-2017-0899)

  - rubygems: No size limit in summary length of gem spec (CVE-2017-0900)

  - rubygems: Arbitrary file overwrite due to incorrect validation of specification name (CVE-2017-0901)

  - rubygems: DNS hijacking vulnerability (CVE-2017-0902)

  - rubygems: Unsafe object deserialization through YAML formatted gem specifications (CVE-2017-0903)

  - ruby: Escape sequence injection vulnerability in the Basic authentication of WEBrick (CVE-2017-10784)

  - ruby: Arbitrary heap exposure during a JSON.generate call (CVE-2017-14064)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0583 advisory.

    Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text     files and to perform system management tasks.

    The following packages have been upgraded to a later upstream version: rh-ruby22-ruby (2.2.9), rh-     ruby22-rubygems (2.4.5.4), rh-ruby22-rubygem-psych (2.0.8.1), rh-ruby22-rubygem-json (1.8.1.1).
    (BZ#1549646)

    Security Fix(es):

    * ruby: Command injection vulnerability in Net::FTP (CVE-2017-17405)

    * ruby: Buffer underrun vulnerability in Kernel.sprintf (CVE-2017-0898)

    * rubygems: Arbitrary file overwrite due to incorrect validation of specification name (CVE-2017-0901)

    * rubygems: DNS hijacking vulnerability (CVE-2017-0902)

    * rubygems: Unsafe object deserialization through YAML formatted gem specifications (CVE-2017-0903)

    * ruby: Escape sequence injection vulnerability in the Basic authentication of WEBrick (CVE-2017-10784)

    * ruby: Buffer underrun in OpenSSL ASN1 decode (CVE-2017-14033)

    * ruby: DL::dlopen could open a library with tainted library name (CVE-2009-5147, CVE-2015-7551)

    * rubygems: Escape sequence in the summary field of gemspec (CVE-2017-0899)

    * rubygems: No size limit in summary length of gem spec (CVE-2017-0900)

    * ruby: Arbitrary heap exposure during a JSON.generate call (CVE-2017-14064)

    * ruby: Command injection in lib/resolv.rb:lazy_initialize() allows arbitrary code execution     (CVE-2017-17790)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This update for ruby2.1 fixes the following issues :

Security issues fixed :

CVE-2015-9096: Fixed an SMTP command injection via CRLFsequences in a RCPT TO or MAIL FROM command (bsc#1043983).

CVE-2016-7798: Fixed an IV Reuse in GCM Mode (bsc#1055265).

CVE-2017-0898: Fixed a buffer underrun vulnerability in Kernel.sprintf (bsc#1058755).

CVE-2017-0899: Fixed an issue with malicious gem specifications, insufficient sanitation when printing gem specifications could have included terminal characters (bsc#1056286).

CVE-2017-0900: Fixed an issue with malicious gem specifications, the query command could have led to a denial of service attack against clients (bsc#1056286).

CVE-2017-0901: Fixed an issue with malicious gem specifications, potentially overwriting arbitrary files on the client system (bsc#1056286).

CVE-2017-0902: Fixed an issue with malicious gem specifications, that could have enabled MITM attacks against clients (bsc#1056286).

CVE-2017-0903: Fixed an unsafe object deserialization vulnerability (bsc#1062452).

CVE-2017-9228: Fixed a heap out-of-bounds write in bitset_set_range() during regex compilation (bsc#1069607).

CVE-2017-9229: Fixed an invalid pointer dereference in left_adjust_char_head() in oniguruma (bsc#1069632).

CVE-2017-10784: Fixed an escape sequence injection vulnerability in the Basic authentication of WEBrick (bsc#1058754).

CVE-2017-14033: Fixed a buffer underrun vulnerability in OpenSSL ASN1 decode (bsc#1058757).

CVE-2017-14064: Fixed an arbitrary memory exposure during a JSON.generate call (bsc#1056782).

CVE-2017-17405: Fixed a command injection vulnerability in Net::FTP (bsc#1073002).

CVE-2017-17742: Fixed an HTTP response splitting issue in WEBrick (bsc#1087434).

CVE-2017-17790: Fixed a command injection in lib/resolv.rb:lazy_initialize() (bsc#1078782).

CVE-2018-6914: Fixed an unintentional file and directory creation with directory traversal in tempfile and tmpdir (bsc#1087441).

CVE-2018-8777: Fixed a potential DoS caused by large requests in WEBrick (bsc#1087436).

CVE-2018-8778: Fixed a buffer under-read in String#unpack (bsc#1087433).

CVE-2018-8779: Fixed an unintentional socket creation by poisoned NUL byte in UNIXServer and UNIXSocket (bsc#1087440).

CVE-2018-8780: Fixed an unintentional directory traversal by poisoned NUL byte in Dir (bsc#1087437).

CVE-2018-16395: Fixed an issue with OpenSSL::X509::Name equality checking (bsc#1112530).

CVE-2018-16396: Fixed an issue with tainted string handling, where the flag was not propagated in Array#pack and String#unpack with some directives (bsc#1112532).

CVE-2018-1000073: Fixed a path traversal issue (bsc#1082007).

CVE-2018-1000074: Fixed an unsafe object deserialization vulnerability in gem owner, allowing arbitrary code execution with specially crafted YAML (bsc#1082008).

CVE-2018-1000075: Fixed an infinite loop vulnerability due to negative size in tar header causes Denial of Service (bsc#1082014).

CVE-2018-1000076: Fixed an improper verification of signatures in tarballs (bsc#1082009).

CVE-2018-1000077: Fixed an improper URL validation in the homepage attribute of ruby gems (bsc#1082010).

CVE-2018-1000078: Fixed a XSS vulnerability in the homepage attribute when displayed via gem server (bsc#1082011).

CVE-2018-1000079: Fixed a path traversal issue during gem installation allows to write to arbitrary filesystem locations (bsc#1082058).

CVE-2019-8320: Fixed a directory traversal issue when decompressing tar files (bsc#1130627).

CVE-2019-8321: Fixed an escape sequence injection vulnerability in verbose (bsc#1130623).

CVE-2019-8322: Fixed an escape sequence injection vulnerability in gem owner (bsc#1130622).

CVE-2019-8323: Fixed an escape sequence injection vulnerability in API response handling (bsc#1130620).

CVE-2019-8324: Fixed an issue with malicious gems that may have led to arbitrary code execution (bsc#1130617).

CVE-2019-8325: Fixed an escape sequence injection vulnerability in errors (bsc#1130611).

CVE-2019-15845: Fixed a NUL injection vulnerability in File.fnmatch and File.fnmatch? (bsc#1152994).

CVE-2019-16201: Fixed a regular expression denial of service vulnerability in WEBrick's digest access authentication (bsc#1152995).

CVE-2019-16254: Fixed an HTTP response splitting vulnerability in WEBrick (bsc#1152992).

CVE-2019-16255: Fixed a code injection vulnerability in Shell#[] and Shell#test (bsc#1152990).

CVE-2020-10663: Fixed an unsafe object creation vulnerability in JSON (bsc#1171517).

Non-security issue fixed :

Add conflicts to libruby to make sure ruby and ruby-stdlib are also updated when libruby is updated (bsc#1048072).

Also yast2-ruby-bindings on SLES 12 SP2 LTSS was updated to handle the updated ruby interpreter. (bsc#1172275)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote NewStart CGSL host, running version MAIN 5.04, has ruby packages installed that are affected by multiple vulnerabilities:

  - A buffer overflow vulnerability was found in the JSON     extension of ruby. An attacker with the ability to pass     a specially crafted JSON input to the extension could     use this flaw to expose the interpreter's heap memory.
    (CVE-2017-14064)

  - The lazy_initialize function in lib/resolv.rb did not     properly process certain filenames. A remote attacker     could possibly exploit this flaw to inject and execute     arbitrary commands. (CVE-2017-17790)

  - It was discovered that the Net::FTP module did not     properly process filenames in combination with certain     operations. A remote attacker could exploit this flaw to     execute arbitrary commands by setting up a malicious FTP     server and tricking a user or Ruby application into     downloading files with specially crafted names using the     Net::FTP module. (CVE-2017-17405)

  - A buffer underflow was found in ruby's sprintf function.
    An attacker, with ability to control its format string     parameter, could send a specially crafted string that     would disclose heap memory or crash the interpreter.
    (CVE-2017-0898)

  - It was found that the decode method of the OpenSSL::ASN1     module was vulnerable to buffer underrun. An attacker     could pass a specially crafted string to the application     in order to crash the ruby interpreter, causing a denial     of service. (CVE-2017-14033)

  - It was found that WEBrick did not sanitize all its log     messages. If logs were printed in a terminal, an     attacker could interact with the terminal via the use of     escape sequences. (CVE-2017-10784)

  - It was found that rubygems did not sanitize gem names     during installation of a given gem. A specially crafted     gem could use this flaw to install files outside of the     regular directory. (CVE-2017-0901)

  - It was found that rubygems could use an excessive amount     of CPU while parsing a sufficiently long gem summary. A     specially crafted gem from a gem repository could freeze     gem commands attempting to parse its summary.
    (CVE-2017-0900)

  - A vulnerability was found where rubygems did not     sanitize DNS responses when requesting the hostname of     the rubygems server for a domain, via a _rubygems._tcp     DNS SRV query. An attacker with the ability to     manipulate DNS responses could direct the gem command     towards a different domain. (CVE-2017-0902)

  - A vulnerability was found where rubygems did not     properly sanitize gems' specification text. A specially     crafted gem could interact with the terminal via the use     of escape sequences. (CVE-2017-0899)

  - A vulnerability was found where the rubygems module was     vulnerable to an unsafe YAML deserialization when     inspecting a gem. Applications inspecting gem files     without installing them can be tricked to execute     arbitrary code in the context of the ruby interpreter.
    (CVE-2017-0903)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the ruby packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - It was discovered that the Net::FTP module did not     properly process filenames in combination with certain     operations. A remote attacker could exploit this flaw     to execute arbitrary commands by setting up a malicious     FTP server and tricking a user or Ruby application into     downloading files with specially crafted names using     the Net::FTP module.(CVE-2017-17405)

  - The 'lazy_initialize' function in lib/resolv.rb did not     properly process certain filenames. A remote attacker     could possibly exploit this flaw to inject and execute     arbitrary commands.(CVE-2017-17790)

  - It was found that rubygems could use an excessive     amount of CPU while parsing a sufficiently long gem     summary. A specially crafted gem from a gem repository     could freeze gem commands attempting to parse its     summary.(CVE-2017-0900)

  - It was found that rubygems did not sanitize gem names     during installation of a given gem. A specially crafted     gem could use this flaw to install files outside of the     regular directory.(CVE-2017-0901)

  - A vulnerability was found where rubygems did not     sanitize DNS responses when requesting the hostname of     the rubygems server for a domain, via a _rubygems._tcp     DNS SRV query. An attacker with the ability to     manipulate DNS responses could direct the gem command     towards a different domain.(CVE-2017-0902)

  - A vulnerability was found where rubygems did not     properly sanitize gems' specification text. A specially     crafted gem could interact with the terminal via the     use of escape sequences.(CVE-2017-0899)

  - A buffer overflow vulnerability was found in the JSON     extension of ruby. An attacker with the ability to pass     a specially crafted JSON input to the extension could     use this flaw to expose the inter preter's heap     memory.(CVE-2017-14064)

  - It was found that WEBrick did not sanitize all its log     messages. If logs were printed in a terminal, an     attacker could interact with the terminal via the use     of escape sequences.(CVE-2017-10784)

  - It was found that the decode method of the     OpenSSL::ASN1 module was vulnerable to buffer underrun.
    An attacker could pass a specially crafted string to     the application in order to crash the ruby interpreter,     causing a denial of service.(CVE-2017-14033)

  - A buffer underflow was found in ruby's sprintf     function. An attacker, with ability to control its     format string parameter, could send a specially crafted     string that would disclose heap memory or crash the     interpreter.(CVE-2017-0898)

  - A vulnerability was found where the rubygems module was     vulnerable to an unsafe YAML deserialization when     inspecting a gem. Applications inspecting gem files     without installing them can be tricked to execute     arbitrary code in the context of the ruby     interpreter.(CVE-2017-0903)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the ruby packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - The lazy_initialize function in lib/resolv.rb in Ruby     through 2.4.3 uses Kernel#open, which might allow     Command Injection attacks, as demonstrated by a     Resolv::Hosts::new argument beginning with a '|'     character, a different vulnerability than     CVE-2017-17405. NOTE: situations with untrusted input     may be highly unlikely.(CVE-2017-17790)

  - A buffer overflow vulnerability was found in the JSON     extension of ruby. An attacker with the ability to pass     a specially crafted JSON input to the extension could     use this flaw to expose the interpreter's heap memory.
    (CVE-2017-14064)

  - It was found that the decode method of the     OpenSSL::ASN1 module was vulnerable to buffer underrun.
    An attacker could pass a specially crafted string to     the application in order to crash the ruby interpreter,     causing a denial of service. (CVE-2017-14033)

  - It was found that rubygems could use an excessive     amount of CPU while parsing a sufficiently long gem     summary. A specially crafted gem from a gem repository     could freeze gem commands attempting to parse its     summary. (CVE-2017-0900)

  - It was found that rubygems did not sanitize gem names     during installation of a given gem. A specially crafted     gem could use this flaw to install files outside of the     regular directory. (CVE-2017-0901)

  - A vulnerability was found where rubygems did not     sanitize DNS responses when requesting the hostname of     the rubygems server for a domain, via a _rubygems._tcp     DNS SRV query. An attacker with the ability to     manipulate DNS responses could direct the gem command     towards a different domain. (CVE-2017-0902)

  - A vulnerability was found where the rubygems module was     vulnerable to an unsafe YAML deserialization when     inspecting a gem. Applications inspecting gem files     without installing them can be tricked to execute     arbitrary code in the context of the ruby interpreter.
    (CVE-2017-0903)

  - It was found that WEBrick did not sanitize all its log     messages. If logs were printed in a terminal, an     attacker could interact with the terminal via the use     of escape sequences. (CVE-2017-10784)

  - It was discovered that the Net::FTP module did not     properly process filenames in combination with certain     operations. A remote attacker could exploit this flaw     to execute arbitrary commands by setting up a malicious     FTP server and tricking a user or Ruby application into     downloading files with specially crafted names using     the Net::FTP module. (CVE-2017-17405)

  - A buffer underflow was found in ruby's sprintf     function. An attacker, with ability to control its     format string parameter, could send a specially crafted     string that would disclose heap memory or crash the     interpreter. (CVE-2017-0898)

  - A vulnerability was found where rubygems did not     properly sanitize gems' specification text. A specially     crafted gem could interact with the terminal via the     use of escape sequences. (CVE-2017-0899)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Multiple vulnerabilities were found in the interpreter for the Ruby language. The Common Vulnerabilities and Exposures project identifies the following issues :

CVE-2015-9096

SMTP command injection in Net::SMTP via CRLF sequences in a RCPT TO or MAIL FROM command.

CVE-2016-2339

Exploitable heap overflow in Fiddle::Function.new.

CVE-2016-7798

Incorrect handling of initialization vector in the GCM mode in the OpenSSL extension.

CVE-2017-0898

Buffer underrun vulnerability in Kernel.sprintf.

CVE-2017-0899

ANSI escape sequence vulnerability in RubyGems.

CVE-2017-0900

DoS vulnerability in the RubyGems query command.

CVE-2017-0901

gem installer allowed a malicious gem to overwrite arbitrary files.

CVE-2017-0902

RubyGems DNS request hijacking vulnerability.

CVE-2017-0903

Max Justicz reported that RubyGems is prone to an unsafe object deserialization vulnerability. When parsed by an application which processes gems, a specially crafted YAML formatted gem specification can lead to remote code execution.

CVE-2017-10784

Yusuke Endoh discovered an escape sequence injection vulnerability in the Basic authentication of WEBrick. An attacker can take advantage of this flaw to inject malicious escape sequences to the WEBrick log and potentially execute control characters on the victim's terminal emulator when reading logs.

CVE-2017-14033

asac reported a buffer underrun vulnerability in the OpenSSL extension. A remote attacker could take advantage of this flaw to cause the Ruby interpreter to crash leading to a denial of service.

CVE-2017-14064

Heap memory disclosure in the JSON library.

CVE-2017-17405

A command injection vulnerability in Net::FTP might allow a malicious FTP server to execute arbitrary commands.

CVE-2017-17742

Aaron Patterson reported that WEBrick bundled with Ruby was vulnerable to an HTTP response splitting vulnerability. It was possible for an attacker to inject fake HTTP responses if a script accepted an external input and output it without modifications.

CVE-2017-17790

A command injection vulnerability in lib/resolv.rb's lazy_initialze might allow a command injection attack. However untrusted input to this function is rather unlikely.

CVE-2018-6914

ooooooo_q discovered a directory traversal vulnerability in the Dir.mktmpdir method in the tmpdir library. It made it possible for attackers to create arbitrary directories or files via a .. (dot dot) in the prefix argument.

CVE-2018-8777

Eric Wong reported an out-of-memory DoS vulnerability related to a large request in WEBrick bundled with Ruby.

CVE-2018-8778

aerodudrizzt found a buffer under-read vulnerability in the Ruby String#unpack method. If a big number was passed with the specifier @, the number was treated as a negative value, and an out-of-buffer read occurred. Attackers could read data on heaps if an script accepts an external input as the argument of String#unpack.

CVE-2018-8779

ooooooo_q reported that the UNIXServer.open and UNIXSocket.open methods of the socket library bundled with Ruby did not check for NUL bytes in the path argument. The lack of check made the methods vulnerable to unintentional socket creation and unintentional socket access.

CVE-2018-8780

ooooooo_q discovered an unintentional directory traversal in some methods in Dir, by the lack of checking for NUL bytes in their parameter.

CVE-2018-1000075

A negative size vulnerability in ruby gem package tar header that could cause an infinite loop.

CVE-2018-1000076

RubyGems package improperly verifies cryptographic signatures. A mis-signed gem could be installed if the tarball contains multiple gem signatures.

CVE-2018-1000077

An improper input validation vulnerability in RubyGems specification homepage attribute could allow malicious gem to set an invalid homepage URL.

CVE-2018-1000078

Cross Site Scripting (XSS) vulnerability in gem server display of homepage attribute.

CVE-2018-1000079

Path Traversal vulnerability during gem installation.

For Debian 8 'Jessie', these problems have been fixed in version 2.1.5-2+deb8u4.

We recommend that you upgrade your ruby2.1 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3685-1 advisory.

    Some of these CVE were already addressed in previous USN: 3439-1, 3553-1, 3528-1. Here we address for the     remain releases.

    It was discovered that Ruby incorrectly handled certain inputs. An attacker could use this to cause a     buffer overrun. (CVE-2017-0898)

    It was discovered that Ruby incorrectly handled certain files. An attacker could use this to overwrite any     file on the filesystem. (CVE-2017-0901)

    It was discovered that Ruby was vulnerable to a DNS hijacking vulnerability. An attacker could use this to     possibly force the RubyGems client to download and install gems from a server that the attacker controls.
    (CVE-2017-0902)

    It was discovered that Ruby incorrectly handled certain YAML files. An attacker could use this to possibly     execute arbitrary code. (CVE-2017-0903)

    It was discovered that Ruby incorrectly handled certain files. An attacker could use this to expose     sensitive information. (CVE-2017-14064)

    It was discovered that Ruby incorrectly handled certain inputs. An attacker could use this to execute     arbitrary code. (CVE-2017-10784)

    It was discovered that Ruby incorrectly handled certain network requests. An attacker could possibly use     this to inject a crafted key into a HTTP response. (CVE-2017-17742)

    It was discovered that Ruby incorrectly handled certain files. An attacker could possibly use this to     execute arbitrary code. This update is only addressed to ruby2.0. (CVE-2018-1000074)

    It was discovered that Ruby incorrectly handled certain network requests. An attacker could possibly use     this to cause a denial of service. (CVE-2018-8777)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Unsafe object deserialization through YAML formatted gem specifications :

A vulnerability was found where the rubygems module was vulnerable to an unsafe YAML deserialization when inspecting a gem. Applications inspecting gem files without installing them can be tricked to execute arbitrary code in the context of the ruby interpreter. (CVE-2017-0903)

According to the versions of the ruby packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - It was discovered that the Net::FTP module did not     properly process filenames in combination with certain     operations. A remote attacker could exploit this flaw     to execute arbitrary commands by setting up a malicious     FTP server and tricking a user or Ruby application into     downloading files with specially crafted names using     the Net::FTP module. (CVE-2017-17405)

  - A buffer underflow was found in ruby's sprintf     function. An attacker, with ability to control its     format string parameter, could send a specially crafted     string that would disclose heap memory or crash the     interpreter. (CVE-2017-0898)

  - It was found that rubygems did not sanitize gem names     during installation of a given gem. A specially crafted     gem could use this flaw to install files outside of the     regular directory. (CVE-2017-0901)

  - A vulnerability was found where rubygems did not     sanitize DNS responses when requesting the hostname of     the rubygems server for a domain, via a _rubygems._tcp     DNS SRV query. An attacker with the ability to     manipulate DNS responses could direct the gem command     towards a different domain. (CVE-2017-0902)

  - A vulnerability was found where the rubygems module was     vulnerable to an unsafe YAML deserialization when     inspecting a gem. Applications inspecting gem files     without installing them can be tricked to execute     arbitrary code in the context of the ruby interpreter.
    (CVE-2017-0903)

  - It was found that WEBrick did not sanitize all its log     messages. If logs were printed in a terminal, an     attacker could interact with the terminal via the use     of escape sequences. (CVE-2017-10784)

  - It was found that the decode method of the     OpenSSL::ASN1 module was vulnerable to buffer underrun.
    An attacker could pass a specially crafted string to     the application in order to crash the ruby interpreter,     causing a denial of service. (CVE-2017-14033)

  - A vulnerability was found where rubygems did not     properly sanitize gems' specification text. A specially     crafted gem could interact with the terminal via the     use of escape sequences. (CVE-2017-0899)

  - It was found that rubygems could use an excessive     amount of CPU while parsing a sufficiently long gem     summary. A specially crafted gem from a gem repository     could freeze gem commands attempting to parse its     summary. (CVE-2017-0900)

  - A buffer overflow vulnerability was found in the JSON     extension of ruby. An attacker with the ability to pass     a specially crafted JSON input to the extension could     use this flaw to expose the interpreter's heap memory.
    (CVE-2017-14064)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for ruby is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks.

Security Fix(es) :

* It was discovered that the Net::FTP module did not properly process filenames in combination with certain operations. A remote attacker could exploit this flaw to execute arbitrary commands by setting up a malicious FTP server and tricking a user or Ruby application into downloading files with specially crafted names using the Net::FTP module. (CVE-2017-17405)

* A buffer underflow was found in ruby's sprintf function. An attacker, with ability to control its format string parameter, could send a specially crafted string that would disclose heap memory or crash the interpreter. (CVE-2017-0898)

* It was found that rubygems did not sanitize gem names during installation of a given gem. A specially crafted gem could use this flaw to install files outside of the regular directory.
(CVE-2017-0901)

* A vulnerability was found where rubygems did not sanitize DNS responses when requesting the hostname of the rubygems server for a domain, via a _rubygems._tcp DNS SRV query. An attacker with the ability to manipulate DNS responses could direct the gem command towards a different domain. (CVE-2017-0902)

* A vulnerability was found where the rubygems module was vulnerable to an unsafe YAML deserialization when inspecting a gem. Applications inspecting gem files without installing them can be tricked to execute arbitrary code in the context of the ruby interpreter. (CVE-2017-0903)

* It was found that WEBrick did not sanitize all its log messages. If logs were printed in a terminal, an attacker could interact with the terminal via the use of escape sequences. (CVE-2017-10784)

* It was found that the decode method of the OpenSSL::ASN1 module was vulnerable to buffer underrun. An attacker could pass a specially crafted string to the application in order to crash the ruby interpreter, causing a denial of service. (CVE-2017-14033)

* A vulnerability was found where rubygems did not properly sanitize gems' specification text. A specially crafted gem could interact with the terminal via the use of escape sequences. (CVE-2017-0899)

* It was found that rubygems could use an excessive amount of CPU while parsing a sufficiently long gem summary. A specially crafted gem from a gem repository could freeze gem commands attempting to parse its summary. (CVE-2017-0900)

* A buffer overflow vulnerability was found in the JSON extension of ruby. An attacker with the ability to pass a specially crafted JSON input to the extension could use this flaw to expose the interpreter's heap memory. (CVE-2017-14064)

* The 'lazy_initialize' function in lib/resolv.rb did not properly process certain filenames. A remote attacker could possibly exploit this flaw to inject and execute arbitrary commands. (CVE-2017-17790)

Security Fix(es) :

  - It was discovered that the Net::FTP module did not     properly process filenames in combination with certain     operations. A remote attacker could exploit this flaw to     execute arbitrary commands by setting up a malicious FTP     server and tricking a user or Ruby application into     downloading files with specially crafted names using the     Net::FTP module. (CVE-2017-17405)

  - A buffer underflow was found in ruby's sprintf function.
    An attacker, with ability to control its format string     parameter, could send a specially crafted string that     would disclose heap memory or crash the interpreter.
    (CVE-2017-0898)

  - It was found that rubygems did not sanitize gem names     during installation of a given gem. A specially crafted     gem could use this flaw to install files outside of the     regular directory. (CVE-2017-0901)

  - A vulnerability was found where rubygems did not     sanitize DNS responses when requesting the hostname of     the rubygems server for a domain, via a _rubygems._tcp     DNS SRV query. An attacker with the ability to     manipulate DNS responses could direct the gem command     towards a different domain. (CVE-2017-0902)

  - A vulnerability was found where the rubygems module was     vulnerable to an unsafe YAML deserialization when     inspecting a gem. Applications inspecting gem files     without installing them can be tricked to execute     arbitrary code in the context of the ruby interpreter.
    (CVE-2017-0903)

  - It was found that WEBrick did not sanitize all its log     messages. If logs were printed in a terminal, an     attacker could interact with the terminal via the use of     escape sequences. (CVE-2017-10784)

  - It was found that the decode method of the OpenSSL::ASN1     module was vulnerable to buffer underrun. An attacker     could pass a specially crafted string to the application     in order to crash the ruby interpreter, causing a denial     of service. (CVE-2017-14033)

  - A vulnerability was found where rubygems did not     properly sanitize gems' specification text. A specially     crafted gem could interact with the terminal via the use     of escape sequences. (CVE-2017-0899)

  - It was found that rubygems could use an excessive amount     of CPU while parsing a sufficiently long gem summary. A     specially crafted gem from a gem repository could freeze     gem commands attempting to parse its summary.
    (CVE-2017-0900)

  - A buffer overflow vulnerability was found in the JSON     extension of ruby. An attacker with the ability to pass     a specially crafted JSON input to the extension could     use this flaw to expose the interpreter's heap memory.
    (CVE-2017-14064)

  - The 'lazy_initialize' function in lib/resolv.rb did not     properly process certain filenames. A remote attacker     could possibly exploit this flaw to inject and execute     arbitrary commands. (CVE-2017-17790)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0378 advisory.

  - ruby: Buffer underrun vulnerability in Kernel.sprintf (CVE-2017-0898)

  - rubygems: Escape sequence in the summary field of gemspec (CVE-2017-0899)

  - rubygems: No size limit in summary length of gem spec (CVE-2017-0900)

  - rubygems: Arbitrary file overwrite due to incorrect validation of specification name (CVE-2017-0901)

  - rubygems: DNS hijacking vulnerability (CVE-2017-0902)

  - rubygems: Unsafe object deserialization through YAML formatted gem specifications (CVE-2017-0903)

  - ruby: Escape sequence injection vulnerability in the Basic authentication of WEBrick (CVE-2017-10784)

  - ruby: Buffer underrun in OpenSSL ASN1 decode (CVE-2017-14033)

  - ruby: Arbitrary heap exposure during a JSON.generate call (CVE-2017-14064)

  - ruby: Command injection vulnerability in Net::FTP (CVE-2017-17405)

  - ruby: Command injection in lib/resolv.rb:lazy_initialize() allows arbitrary code execution     (CVE-2017-17790)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-0378 advisory.

    - Add Psych.safe_load
      * ruby-2.1.0-there-should-be-only-one-exception.patch
      * ruby-2.1.0-Adding-Psych.safe_load.patch       Related: CVE-2017-0903
    - Disable Tokyo TZ tests broken by recen tzdata update.
      * ruby-2.5.0-Disable-Tokyo-TZ-tests.patch       Related: CVE-2017-0903
    - Fix unsafe object deserialization in RubyGems (CVE-2017-0903).
      * ruby-2.4.3-CVE-2017-0903-Fix-unsafe-object-deserialization
          -vulnerability.patch       Resolves: CVE-2017-0903
    - Fix an ANSI escape sequence vulnerability (CVE-2017-0899).
      Resolves: CVE-2017-0899
    - Fix a DOS vulernerability in the query command (CVE-2017-0900).
      Resolves: CVE-2017-0900
    - Fix a vulnerability in the gem installer that allowed a malicious gem         to overwrite arbitrary files (CVE-2017-0901).
      Resolves: CVE-2017-0901
    - Fix a DNS request hijacking vulnerability (CVE-2017-0902).
      * ruby-2.2.8-lib-rubygems-fix-several-vulnerabilities-in-RubyGems.patch       Resolves: CVE-2017-0902
    - Fix buffer underrun vulnerability in Kernel.sprintf (CVE-2017-0898).
      * ruby-2.2.8-Buffer-underrun-vulnerability-in-Kernel.sprintf.patch       Resolves: CVE-2017-0898
    - Escape sequence injection vulnerability in the Basic         authentication of WEBrick (CVE-2017-10784).
      * ruby-2.2.8-sanitize-any-type-of-logs.patch       Resolves: CVE-2017-10784
    - Arbitrary heap exposure during a JSON.generate call (CVE-2017-14064).
      * ruby-2.2.8-Fix-arbitrary-heap-exposure-during-a-JSON.generate-call.patch       Resolves: CVE-2017-14064
    - Command injection vulnerability in Net::FTP (CVE-2017-17405).
      * ruby-2.2.9-Fix-a-command-injection-vulnerability-in-Net-FTP.patch       Resolves: CVE-2017-17405
    - Buffer underrun in OpenSSL ASN1 decode (CVE-2017-14033).
      * ruby-2.2.8-asn1-fix-out-of-bounds-read-in-decoding-constructed-objects.patch       Resolves: CVE-2017-14033

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3553-1 advisory.

    It was discovered that Ruby failed to validate specification names. An attacker could possibly use a     maliciously crafted gem to potentially overwrite any file on the filesystem. (CVE-2017-0901)

    It was discovered that Ruby was vulnerable to a DNS hijacking vulnerability. An attacker could use this to     possibly force the RubyGems client to download and install gems from a server that the attacker controls.
    (CVE-2017-0902)

    It was discovered that Ruby incorrectly handled certain YAML files. An attacker could use this to possibly     execute arbitrary code. (CVE-2017-0903)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Update to Ruby 2.4.3.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities have been discovered in the interpreter for the Ruby language. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2017-0898     aerodudrizzt reported a buffer underrun vulnerability in     the sprintf method of the Kernel module resulting in     heap memory corruption or information disclosure from     the heap.

  - CVE-2017-0903     Max Justicz reported that RubyGems is prone to an unsafe     object deserialization vulnerability. When parsed by an     application which processes gems, a specially crafted     YAML formatted gem specification can lead to remote code     execution.

  - CVE-2017-10784     Yusuke Endoh discovered an escape sequence injection     vulnerability in the Basic authentication of WEBrick. An     attacker can take advantage of this flaw to inject     malicious escape sequences to the WEBrick log and     potentially execute control characters on the victim's     terminal emulator when reading logs.

  - CVE-2017-14033     asac reported a buffer underrun vulnerability in the     OpenSSL extension. A remote attacker can take advantage     of this flaw to cause the Ruby interpreter to crash     leading to a denial of service.

Arbitrary heap exposure during a JSON.generate call

Ruby through 2.2.7, 2.3.x through 2.3.4, and 2.4.x through 2.4.1 can expose arbitrary memory during a JSON.generate call. The issues lies in using strdup in ext/json/ext/generator/generator.c, which will stop after encountering a '\\0' byte, returning a pointer to a string of length zero, which is not the length stored in space_len.
(CVE-2017-14064)

Escape sequence injection vulnerability in the Basic authentication of WEBrick

The Basic authentication code in WEBrick library in Ruby before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name. (CVE-2017-10784)

Buffer underrun in OpenSSL ASN1 decode

The decode method in the OpenSSL::ASN1 module in Ruby before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows attackers to cause a denial of service (interpreter crash) via a crafted string.
(CVE-2017-14033)

No size limit in summary length of gem spec

RubyGems version 2.6.12 and earlier is vulnerable to maliciously crafted gem specifications to cause a denial of service attack against RubyGems clients who have issued a `query` command. (CVE-2017-0900)

Arbitrary file overwrite due to incorrect validation of specification name

RubyGems version 2.6.12 and earlier fails to validate specification names, allowing a maliciously crafted gem to potentially overwrite any file on the filesystem. (CVE-2017-0901)

DNS hijacking vulnerability

RubyGems version 2.6.12 and earlier is vulnerable to a DNS hijacking vulnerability that allows a MITM attacker to force the RubyGems client to download and install gems from a server that the attacker controls.
(CVE-2017-0902)

Buffer underrun vulnerability in Kernel.sprintf

Ruby before 2.4.2, 2.3.5, and 2.2.8 is vulnerable to a malicious format string which contains a precious specifier (*) with a huge minus value. Such situation can lead to a buffer overrun, resulting in a heap memory corruption or an information disclosure from the heap.
(CVE-2017-0898)

Escape sequence in the 'summary' field of gemspec

RubyGems version 2.6.12 and earlier is vulnerable to maliciously crafted gem specifications that include terminal escape characters.
Printing the gem specification would execute terminal escape sequences. (CVE-2017-0899)

A vulnerability was found where the rubygems module was vulnerable to an unsafe YAML deserialization when inspecting a gem. Applications inspecting gem files without installing them can be tricked to execute arbitrary code in the context of the ruby interpreter. (CVE-2017-0903)

oss-security mailing list :

There is a possible unsafe object desrialization vulnerability in RubyGems. It is possible for YAML deserialization of gem specifications to bypass class white lists. Specially crafted serialized objects can possibly be used to escalate to remote code execution.

SMTP command injection via CRLF sequences in RCPT TO or MAIL FROM commands in Net::SMTP

A SMTP command injection flaw was found in the way Ruby's Net::SMTP module handled CRLF sequences in certain SMTP commands. An attacker could potentially use this flaw to inject SMTP commands in a SMTP session in order to facilitate phishing attacks or spam campaigns.
(CVE-2015-9096)

Escape sequence injection vulnerability in the Basic authentication of WEBrick

The Basic authentication code in WEBrick library in Ruby allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name.
(CVE-2017-10784)

Buffer underrun in OpenSSL ASN1 decode

The decode method in the OpenSSL::ASN1 module in Ruby allows attackers to cause a denial of service (interpreter crash) via a crafted string.
(CVE-2017-14033)

No size limit in summary length of gem spec

RubyGems is vulnerable to maliciously crafted gem specifications to cause a denial of service attack against RubyGems clients who have issued a `query` command. (CVE-2017-0900)

Arbitrary file overwrite due to incorrect validation of specification name

RubyGems fails to validate specification names, allowing a maliciously crafted gem to potentially overwrite any file on the filesystem.
(CVE-2017-0901)

DNS hijacking vulnerability

RubyGems is vulnerable to a DNS hijacking vulnerability that allows a MITM attacker to force the RubyGems client to download and install gems from a server that the attacker controls. (CVE-2017-0902)

Buffer underrun vulnerability in Kernel.sprintf

Ruby is vulnerable to a malicious format string which contains a precious specifier (*) with a huge minus value. Such situation can lead to a buffer overrun, resulting in a heap memory corruption or an information disclosure from the heap. (CVE-2017-0898)

Escape sequence in the 'summary' field of gemspec

RubyGems is vulnerable to maliciously crafted gem specifications that include terminal escape characters. Printing the gem specification would execute terminal escape sequences. (CVE-2017-0899)

Arbitrary heap exposure during a JSON.generate call

Ruby can expose arbitrary memory during a JSON.generate call. The issues lies in using strdup in ext/json/ext/generator/generator.c, which will stop after encountering a '\\0' byte, returning a pointer to a string of length zero, which is not the length stored in space_len. (CVE-2017-14064)

A vulnerability was found where the rubygems module was vulnerable to an unsafe YAML deserialization when inspecting a gem. Applications inspecting gem files without installing them can be tricked to execute arbitrary code in the context of the ruby interpreter. (CVE-2017-0903)

ID	Name	Product	Family	Severity
194120	RHEL 6 / 7 : rh-ruby23-ruby (RHSA-2018:0585)	Nessus	Red Hat Local Security Checks	critical
194088	RHEL 6 / 7 : rh-ruby24-ruby (RHSA-2017:3485)	Nessus	Red Hat Local Security Checks	critical
194057	RHEL 6 / 7 : rh-ruby22-ruby (RHSA-2018:0583)	Nessus	Red Hat Local Security Checks	critical
137599	SUSE SLES12 Security Update : ruby2.1 (SUSE-SU-2020:1570-1)	Nessus	SuSE Local Security Checks	critical
127164	NewStart CGSL MAIN 5.04 : ruby Multiple Vulnerabilities (NS-SA-2019-0013)	Nessus	NewStart CGSL Local Security Checks	critical
124910	EulerOS Virtualization for ARM 64 3.0.1.0 : ruby (EulerOS-SA-2019-1407)	Nessus	Huawei Local Security Checks	critical
117557	EulerOS Virtualization 2.5.0 : ruby (EulerOS-SA-2018-1248)	Nessus	Huawei Local Security Checks	critical
111081	Debian DLA-1421-1 : ruby2.1 security update	Nessus	Debian Local Security Checks	critical
110551	Ubuntu 14.04 LTS / 16.04 LTS : Ruby vulnerabilities (USN-3685-1)	Nessus	Ubuntu Local Security Checks	critical
108603	Amazon Linux AMI : ruby24 / ruby22,ruby23 (ALAS-2018-978)	Nessus	Amazon Linux Local Security Checks	critical
108471	EulerOS 2.0 SP2 : ruby (EulerOS-SA-2018-1067)	Nessus	Huawei Local Security Checks	high
108470	EulerOS 2.0 SP1 : ruby (EulerOS-SA-2018-1066)	Nessus	Huawei Local Security Checks	high
107270	CentOS 7 : ruby (CESA-2018:0378)	Nessus	CentOS Local Security Checks	critical
107084	Scientific Linux Security Update : ruby on SL7.x x86_64 (20180228)	Nessus	Scientific Linux Local Security Checks	critical
107082	RHEL 7 : ruby (RHSA-2018:0378)	Nessus	Red Hat Local Security Checks	critical
107080	Oracle Linux 7 : ruby (ELSA-2018-0378)	Nessus	Oracle Linux Local Security Checks	critical
106557	Ubuntu 16.04 LTS : Ruby vulnerabilities (USN-3553-1)	Nessus	Ubuntu Local Security Checks	critical
106278	Fedora 27 : ruby (2018-75e780a7c2)	Nessus	Fedora Local Security Checks	critical
104503	Debian DSA-4031-1 : ruby2.3 - security update	Nessus	Debian Local Security Checks	critical
104181	Amazon Linux AMI : ruby24 (ALAS-2017-915)	Nessus	Amazon Linux Local Security Checks	critical
103760	FreeBSD : rubygems -- deserialization vulnerability (2c8bd00d-ada2-11e7-82af-8dbff7d75206)	Nessus	FreeBSD Local Security Checks	critical
103603	Amazon Linux AMI : ruby22 / ruby23 (ALAS-2017-906)	Nessus	Amazon Linux Local Security Checks	critical

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