Detections
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Amazon Linux AMI : ruby24 (ALAS-2017-915)
critical Nessus Plugin ID 104181
Language:
Synopsis
The remote Amazon Linux AMI host is missing a security update.Description
Arbitrary heap exposure during a JSON.generate callRuby 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)
Solution
Run 'yum update ruby24' to update your system.See Also
Plugin Details
Severity: Critical
ID: 104181
File Name: ala_ALAS-2017-915.nasl
Version: 3.5
Type: local
Agent: unix
Published: 10/27/2017
Updated: 4/10/2019
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: High
Base Score: 9.3
Temporal Score: 7.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:rubygems24, p-cpe:/a:amazon:linux:ruby24-irb, p-cpe:/a:amazon:linux:rubygem24-io-console, p-cpe:/a:amazon:linux:rubygem24-json, p-cpe:/a:amazon:linux:rubygems24-devel, p-cpe:/a:amazon:linux:ruby24, p-cpe:/a:amazon:linux:ruby24-doc, p-cpe:/a:amazon:linux:rubygem24-xmlrpc, p-cpe:/a:amazon:linux:rubygem24-bigdecimal, p-cpe:/a:amazon:linux:ruby24-devel, p-cpe:/a:amazon:linux:rubygem24-did_you_mean, p-cpe:/a:amazon:linux:rubygem24-psych, p-cpe:/a:amazon:linux:ruby24-libs, p-cpe:/a:amazon:linux:ruby24-debuginfo, cpe:/o:amazon:linux
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 10/26/2017
Reference Information
CVE: CVE-2017-0898, CVE-2017-0899, CVE-2017-0900, CVE-2017-0901, CVE-2017-0902, CVE-2017-0903, CVE-2017-10784, CVE-2017-14033, CVE-2017-14064
ALAS: 2017-915