libcurl may read outside of a heap allocated buffer when doing FTP. When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the `PWD` command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses. Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path. A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault. The simple fact that this has issue remained undiscovered for this long could suggest that malformed PWD responses are rare in benign servers. We are not aware of any exploit of this flaw. This bug was introduced in commit [415d2e7cb7](https://github.com/curl/curl/commit/415d2e7cb7), March 2005. In libcurl version 7.56.0, the parser always zero terminates the string but also rejects it if not terminated properly with a final double quote.

The remote NewStart CGSL host, running version MAIN 6.02, has curl packages installed that are affected by multiple vulnerabilities:

  - The redirect implementation in curl and libcurl 5.11 through 7.19.3, when CURLOPT_FOLLOWLOCATION is     enabled, accepts arbitrary Location values, which might allow remote HTTP servers to (1) trigger arbitrary     requests to intranet servers, (2) read or overwrite arbitrary files via a redirect to a file: URL, or (3)     execute arbitrary commands via a redirect to an scp: URL. (CVE-2009-0037)

  - The Curl_input_negotiate function in http_negotiate.c in libcurl 7.10.6 through 7.21.6, as used in curl     and other products, always performs credential delegation during GSSAPI authentication, which allows     remote servers to impersonate clients via GSSAPI requests. (CVE-2011-2192)

  - curl and libcurl 7.2x before 7.24.0 do not properly consider special characters during extraction of a     pathname from a URL, which allows remote attackers to conduct data-injection attacks via a crafted URL, as     demonstrated by a CRLF injection attack on the (1) IMAP, (2) POP3, or (3) SMTP protocol. (CVE-2012-0036)

  - Stack-based buffer overflow in the Curl_sasl_create_digest_md5_message function in lib/curl_sasl.c in curl     and libcurl 7.26.0 through 7.28.1, when negotiating SASL DIGEST-MD5 authentication, allows remote     attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long string in     the realm parameter in a (1) POP3, (2) SMTP or (3) IMAP message. (CVE-2013-0249)

  - The tailMatch function in cookie.c in cURL and libcurl before 7.30.0 does not properly match the path     domain when sending cookies, which allows remote attackers to steal cookies via a matching suffix in the     domain of a URL. (CVE-2013-1944)

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 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - curl: NTLM password overflow via integer overflow (CVE-2018-14618)

  - cURL and libcurl 7.10.6 through 7.34.0, when more than one authentication method is enabled, re-uses NTLM     connections, which might allow context-dependent attackers to authenticate as other users via a request.
    (CVE-2014-0015)

  - The default configuration in cURL and libcurl 7.10.6 before 7.36.0 re-uses (1) SCP, (2) SFTP, (3) POP3,     (4) POP3S, (5) IMAP, (6) IMAPS, (7) SMTP, (8) SMTPS, (9) LDAP, and (10) LDAPS connections, which might     allow context-dependent attackers to connect as other users via a request, a similar issue to     CVE-2014-0015. (CVE-2014-0138)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - curl: NTLM password overflow via integer overflow (CVE-2018-14618)

  - The default configuration for cURL and libcurl before 7.42.1 sends custom HTTP headers to both the proxy     and destination server, which might allow remote proxy servers to obtain sensitive information by reading     the header contents. (CVE-2015-3153)

  - The ConnectionExists function in lib/url.c in libcurl before 7.47.0 does not properly re-use NTLM-     authenticated proxy connections, which might allow remote attackers to authenticate as other users via a     request, a similar issue to CVE-2014-0015. (CVE-2016-0755)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - curl: FTP wildcard out of bounds read (CVE-2017-8817)

  - CRLF injection vulnerability in libcurl 6.0 through 7.x before 7.40.0, when using an HTTP proxy, allows     remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via CRLF     sequences in a URL. (CVE-2014-8150)

  - The default configuration for cURL and libcurl before 7.42.1 sends custom HTTP headers to both the proxy     and destination server, which might allow remote proxy servers to obtain sensitive information by reading     the header contents. (CVE-2015-3153)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:3558 advisory.

  - curl: TLS session resumption client cert bypass (CVE-2016-5419)

  - curl: Re-using connection with wrong client cert (CVE-2016-5420)

  - curl: Use of connection struct after free (CVE-2016-5421)

  - curl: Incorrect reuse of client certificates (CVE-2016-7141)

  - curl: escape and unescape integer overflows (CVE-2016-7167)

  - curl: Cookie injection for other servers (CVE-2016-8615)

  - curl: Case insensitive password comparison (CVE-2016-8616)

  - curl: Out-of-bounds write via unchecked multiplication (CVE-2016-8617)

  - curl: Double-free in curl_maprintf (CVE-2016-8618)

  - curl: Double-free in krb5 code (CVE-2016-8619)

  - curl: Glob parser write/read out of bounds (CVE-2016-8620)

  - curl: curl_getdate out-of-bounds read (CVE-2016-8621)

  - curl: URL unescape heap overflow via integer truncation (CVE-2016-8622)

  - curl: Use-after-free via shared cookies (CVE-2016-8623)

  - curl: Invalid URL parsing with '#' (CVE-2016-8624)

  - curl: IDNA 2003 makes curl use wrong host (CVE-2016-8625)

  - curl: printf floating point buffer overflow (CVE-2016-9586)

  - curl: --write-out out of bounds read (CVE-2017-7407)

  - curl: NTLM buffer overflow via integer overflow (CVE-2017-8816)

  - curl: FTP wildcard out of bounds read (CVE-2017-8817)

  - httpd: Out of bounds write in mod_authnz_ldap when using too small Accept-Language values (CVE-2017-15710)

  - httpd: <FilesMatch> bypass with a trailing newline in the file name (CVE-2017-15715)

  - curl: TFTP sends more than buffer size (CVE-2017-1000100)

  - curl: URL globbing out of bounds read (CVE-2017-1000101)

  - curl: FTP PWD response parser out of bounds read (CVE-2017-1000254)

  - curl: IMAP FETCH response out of bounds read (CVE-2017-1000257)

  - httpd: Improper handling of headers in mod_session can allow a remote user to modify session data for CGI     applications (CVE-2018-1283)

  - httpd: Out of bounds access after failure in reading the HTTP request (CVE-2018-1301)

  - httpd: Out of bounds read in mod_cache_socache can allow a remote attacker to cause DoS (CVE-2018-1303)

  - httpd: Weak Digest auth nonce generation in mod_auth_digest (CVE-2018-1312)

  - httpd: mod_http2: Too much time allocated to workers, possibly leading to DoS (CVE-2018-1333)

  - httpd: DoS for HTTP/2 connections by continuous SETTINGS frames (CVE-2018-11763)

  - curl: NTLM password overflow via integer overflow (CVE-2018-14618)

  - curl: HTTP authentication leak in redirects (CVE-2018-1000007)

  - curl: FTP path trickery leads to NIL byte out of bounds write (CVE-2018-1000120)

  - curl: LDAP NULL pointer dereference (CVE-2018-1000121)

  - curl: RTSP RTP buffer over-read (CVE-2018-1000122)

  - curl: Out-of-bounds heap read when missing RTSP headers allows information leak or denial of service     (CVE-2018-1000301)

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

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

  - curl version curl 7.20.0 to and including curl 7.59.0     contains a CWE-126: Buffer Over-read vulnerability in     denial of service that can result in curl can be     tricked into reading data beyond the end of a heap     based buffer used to store downloaded RTSP     content..(CVE-2018-1000301)

  - It was found that the libcurl library did not check the     client certificate when choosing the TLS connection to     reuse. An attacker could potentially use this flaw to     hijack the authentication of the connection by     leveraging a previously created connection with a     different client certificate.(CVE-2016-5420)

  - It was discovered that libcurl could incorrectly reuse     NTLM-authenticated connections for subsequent     unauthenticated requests to the same host. If an     application using libcurl established an     NTLM-authenticated connection to a server, and sent     subsequent unauthenticated requests to the same server,     the unauthenticated requests could be sent over the     NTLM-authenticated connection, appearing as if they     were sent by the NTLM authenticated     user.(CVE-2015-3143)

  - libcurl may read outside of a heap allocated buffer     when doing FTP. When libcurl connects to an FTP server     and successfully logs in (anonymous or not), it asks     the server for the current directory with the `PWD`     command. The server then responds with a 257 response     containing the path, inside double quotes. The returned     path name is then kept by libcurl for subsequent uses.
    Due to a flaw in the string parser for this directory     name, a directory name passed like this but without a     closing double quote would lead to libcurl not adding a     trailing NUL byte to the buffer holding the name. When     libcurl would then later access the string, it could     read beyond the allocated heap buffer and crash or     wrongly access data beyond the buffer, thinking it was     part of the path. A malicious server could abuse this     fact and effectively prevent libcurl-based clients to     work with it - the PWD command is always issued on new     FTP connections and the mistake has a high chance of     causing a segfault. The simple fact that this has issue     remained undiscovered for this long could suggest that     malformed PWD responses are rare in benign servers. We     are not aware of any exploit of this flaw. This bug was     introduced in commit     415d2e7cb7(https://github.com/curl/curl/commit/415d2e7c     b7), March 2005. In libcurl version 7.56.0, the parser     always zero terminates the string but also rejects it     if not terminated properly with a final double     quote.(CVE-2017-1000254)

  - It was discovered that libcurl could incorrectly reuse     Negotiate authenticated HTTP connections for subsequent     requests. If an application using libcurl established a     Negotiate authenticated HTTP connection to a server and     sent subsequent requests with different credentials,     the connection could be re-used with the initial set of     credentials instead of using the new     ones.(CVE-2015-3148)

  - Heap-based buffer overflow in the curl_easy_unescape     function in lib/escape.c in cURL and libcurl 7.7     through 7.30.0 allows remote attackers to cause a     denial of service (application crash) or possibly     execute arbitrary code via a crafted string ending in a     ''%'' (percent) character.(CVE-2013-2174)

  - ** RESERVED ** This candidate has been reserved by an     organization or individual that will use it when     announcing a new security problem. When the candidate     has been publicized, the details for this candidate     will be provided.(CVE-2016-8616)

  - ** RESERVED ** This candidate has been reserved by an     organization or individual that will use it when     announcing a new security problem. When the candidate     has been publicized, the details for this candidate     will be provided.(CVE-2016-8619)

  - It was found that curl and libcurl might send their     Authentication header to a third party HTTP server upon     receiving an HTTP REDIRECT reply. This could leak     authentication token to external     entities.(CVE-2018-1000007)

  - A flaw was found in the way the libcurl library     performed the duplication of connection handles. If an     application set the CURLOPT_COPYPOSTFIELDS option for a     handle, using the handle's duplicate could cause the     application to crash or disclose a portion of its     memory.(CVE-2014-3707)

  - Multiple integer overflow flaws leading to heap-based     buffer overflows were found in the way curl handled     escaping and unescaping of data. An attacker could     potentially use these flaws to crash an application     using libcurl by sending a specially crafted input to     the affected libcurl functions.(CVE-2016-7167)

  - When doing a TFTP transfer and curl/libcurl is given a     URL that contains a very long file name (longer than     about 515 bytes), the file name is truncated to fit     within the buffer boundaries, but the buffer size is     still wrongly updated to use the untruncated length.
    This too large value is then used in the sendto() call,     making curl attempt to send more data than what is     actually put into the buffer. The endto() function will     then read beyond the end of the heap based buffer. A     malicious HTTP(S) server could redirect a vulnerable     libcurl-using client to a crafted TFTP URL (if the     client hasn't restricted which protocols it allows     redirects to) and trick it to send private memory     contents to a remote server over UDP. Limit curl's     redirect protocols with --proto-redir and libcurl's     with CURLOPT_REDIR_PROTOCOLS.(CVE-2017-1000100)

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.

The remote host is running a version of macOS that is 10.13.x prior to 10.13.2. It is, therefore, affected by multiple vulnerabilities in the following components :

 - Apache
 - curl
 - Directory Utility
 - IOAcceleratorFamily
 - IOKit
 - Intel Graphics Driver
 - Kernel
 - Mail
 - Mail Drafts
 - OpenSSL
 - Screen Sharing Server

Note that successful exploitation of the most serious issues can result in arbitrary code execution.

libcurl is vulnerable to a heap buffer out-of-bounds read. The function handling incoming NTLM type-2 messages (`lib/vauth/ntlm.c:ntlm_decode_type2_target`) does not validate incoming data correctly and is subject to an integer overflow vulnerability. Using that overflow, a malicious or broken NTLM server could trick libcurl to accept a bad length + offset combination that would lead to a buffer read out-of-bounds.(CVE-2018-16890)

The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denial of service (integer overflow and resultant buffer overflow, and application crash) or possibly have unspecified other impact via vectors involving long user and password fields.(CVE-2017-8816)

curl and libcurl before 7.57.0 on 32-bit platforms allow attackers to cause a denial of service (out-of-bounds access and application crash) or possibly have unspecified other impact because too little memory is allocated for interfacing to an SSL library.(CVE-2017-8818)

libcurl may read outside of a heap allocated buffer when doing FTP.
When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the `PWD` command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses. Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path. A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault. The simple fact that this has issue remained undiscovered for this long could suggest that malformed PWD responses are rare in benign servers. We are not aware of any exploit of this flaw. This bug was introduced in commit [415d2e7cb7](https://github.com/curl/curl/commit/415d2e7cb7), March 2005. In libcurl version 7.56.0, the parser always zero terminates the string but also rejects it if not terminated properly with a final double quote.(CVE-2017-1000254)

Curl versions 7.14.1 through 7.61.1 are vulnerable to a heap-based buffer over-read in the tool_msgs.c:voutf() function that may result in information exposure and denial of service.(CVE-2018-16842)

libcurl is vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data.
The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.(CVE-2019-3822)

libcurl is vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. The read contents will not be returned to the caller.(CVE-2019-3823)

The FTP wildcard function in curl and libcurl before 7.57.0 allows remote attackers to cause a denial of service (out-of-bounds read and application crash) or possibly have unspecified other impact via a string that ends with an '[' character.(CVE-2017-8817)

set_file_metadata in xattr.c in GNU Wget before 1.20.1 stores a file's origin URL in the user.xdg.origin.url metadata attribute of the extended attributes of the downloaded file, which allows local users to obtain sensitive information (e.g., credentials contained in the URL) by reading this attribute, as demonstrated by getfattr. This also applies to Referer information in the user.xdg.referrer.url metadata attribute. According to 2016-07-22 in the Wget ChangeLog, user.xdg.origin.url was partially based on the behavior of fwrite_xattr in tool_xattr.c in curl.(CVE-2018-20483)

A buffer overrun flaw was found in the IMAP handler of libcurl. By tricking an unsuspecting user into connecting to a malicious IMAP server, an attacker could exploit this flaw to potentially cause information disclosure or crash the application.(CVE-2017-1000257)

A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.(CVE-2018-16840)

Curl versions 7.33.0 through 7.61.1 are vulnerable to a buffer overrun in the SASL authentication code that may lead to denial of service.(CVE-2018-16839)

An update of the curl package has been released.

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

  - It was found that libcurl did not safely parse FTP URLs     when using the CURLOPT_FTP_FILEMETHOD method. An     attacker, able to provide a specially crafted FTP URL     to an application using libcurl, could write a NULL     byte at an arbitrary location, resulting in a crash, or     an unspecified behavior.(CVE-2018-1000120)

  - A NULL pointer dereference flaw was found in the way     libcurl checks values returned by the openldap     ldap_get_attribute_ber() function. A malicious LDAP     server could use this flaw to crash a libcurl client     application via a specially crafted LDAP     reply.(CVE-2018-1000121)

  - A buffer over-read exists in curl 7.20.0 to and     including curl 7.58.0 in the RTSP+RTP handling code     that allows an attacker to cause a denial of service or     information leakage(CVE-2018-1000122)

  - curl version curl 7.20.0 to and including curl 7.59.0     contains a Buffer Over-read vulnerability in denial of     service that can result in curl can be tricked into     reading data beyond the end of a heap based buffer used     to store downloaded rtsp content.(CVE-2018-1000301)

  - curl version curl 7.20.0 to and including curl 7.59.0     contains a Buffer Over-read vulnerability in denial of     service that can result in curl can be tricked into     reading data beyond the end of a heap based buffer used     to store downloaded rtsp content.(CVE-2016-9586)

  - libcurl may read outside of a heap allocated buffer     when doing FTP. When libcurl connects to an FTP server     and successfully logs in (anonymous or not), it asks     the server for the current directory with the `PWD`     command. The server then responds with a 257 response     containing the path, inside double quotes. The returned     path name is then kept by libcurl for subsequent uses.
    Due to a flaw in the string parser for this directory     name, a directory name passed like this but without a     closing double quote would lead to libcurl not adding a     trailing NUL byte to the buffer holding the name. When     libcurl would then later access the string, it could     read beyond the allocated heap buffer and crash or     wrongly access data beyond the buffer, thinking it was     part of the path. A malicious server could abuse this     fact and effectively prevent libcurl-based clients to     work with it - the PWD command is always issued on new     FTP connections and the mistake has a high chance of     causing a segfault. The simple fact that this has issue     remained undiscovered for this long could suggest that     malformed PWD responses are rare in benign servers. We     are not aware of any exploit of this flaw. This bug was     introduced in commit     [415d2e7cb7](https://github.com/curl/curl/commit/415d2e     7cb7), March 2005. In libcurl version 7.56.0, the     parser always zero terminates the string but also     rejects it if not terminated properly with a final     double quote.i1/4^CVE-2017-1000254i1/4%0

  - The FTP wildcard function in curl and libcurl before     7.57.0 allows remote attackers to cause a denial of     service (out-of-bounds read and application crash) or     possibly have unspecified other impact via a string     that ends with an '[' character.The FTP wildcard     function in curl and libcurl before 7.57.0 allows     remote attackers to cause a denial of service     (out-of-bounds read and application crash) or possibly     have unspecified other impact via a string that ends     with an '[' character.i1/4^CVE-2017-8817i1/4%0

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.

- fix out of bounds read in FTP PWD response parser     (CVE-2017-1000254)

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.

The remote host is affected by the vulnerability described in GLSA-201712-04 (cURL: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in cURL. Please review the       CVE identifiers referenced below for details.
  Impact :

    Remote attackers could cause a Denial of Service condition, disclose       sensitive information or other unspecified impacts.
  Workaround :

    There is no known workaround at this time.

The remote host is running Mac OS X 10.11.6 or Mac OS X 10.12.6 and is missing a security update. It is therefore, affected by multiple vulnerabilities affecting the following components :

  - apache
  - curl
  - IOAcceleratorFamily
  - IOKit
  - Kernel
  - OpenSSL
  - Screen Sharing Server

The remote host is running a version of Mac OS X that is 10.13.x prior to 10.13.2. It is, therefore, affected by multiple vulnerabilities in the following components :

  - apache
  - curl
  - Directory Utility
  - IOAcceleratorFamily
  - IOKit
  - Intel Graphics Driver
  - Kernel
  - Mail
  - Mail Drafts
  - OpenSSL
  - Screen Sharing Server

Note that successful exploitation of the most serious issues can result in arbitrary code execution.

This update for curl fixes the following security issues :

  - CVE-2017-1000254: FTP PWD response parser out of bounds     read (bsc#1061876)

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.

According to the version of the curl packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - libcurl may read outside of a heap allocated buffer     when doing FTP. When libcurl connects to an FTP server     and successfully logs in (anonymous or not), it asks     the server for the current directory with the `PWD`     command. The server then responds with a 257 response     containing the path, inside double quotes. The returned     path name is then kept by libcurl for subsequent uses.
    Due to a flaw in the string parser for this directory     name, a directory name passed like this but without a     closing double quote would lead to libcurl not adding a     trailing NUL byte to the buffer holding the name. When     libcurl would then later access the string, it could     read beyond the allocated heap buffer and crash or     wrongly access data beyond the buffer, thinking it was     part of the path. A malicious server could abuse this     fact and effectively prevent libcurl-based clients to     work with it - the PWD command is always issued on new     FTP connections and the mistake has a high chance of     causing a segfault. The simple fact that this has issue     remained undiscovered for this long could suggest that     malformed PWD responses are rare in benign servers. We     are not aware of any exploit of this flaw. This bug was     introduced in commit     [415d2e7cb7](https://github.com/curl/curl/commit/415d2e     7cb7), March 2005. In libcurl version 7.56.0, the     parser always zero terminates the string but also     rejects it if not terminated properly with a final     double quote.(CVE-2017-1000254)

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.

FTP PWD response parser out of bounds read

libcurl may read outside of a heap allocated buffer when doing FTP.
When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the `PWD` command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses. Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path. A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault. The simple fact that this has issue remained undiscovered for this long could suggest that malformed PWD responses are rare in benign servers. We are not aware of any exploit of this flaw. This bug was introduced in commit [415d2e7cb7](https://github.com/curl/curl/commit/415d2e7cb7), March 2005. In libcurl version 7.56.0, the parser always zero terminates the string but also rejects it if not terminated properly with a final double quote. (CVE-2017-1000254 )

This update for curl fixes the following issues :

Security issues fixed :

  - CVE-2017-1000254: FTP PWD response parser out of bounds     read (bsc#1061876)

  - CVE-2017-1000257: IMAP FETCH response out of bounds read     (bsc#1063824)

Bugs fixed :

  - Fixed error 'error:1408F10B:SSL routines' when     connecting to ftps via proxy (bsc#1060653)

This update was imported from the SUSE:SLE-12:Update update project.

This update for curl fixes the following issues: Security issues fixed :

  - CVE-2017-1000254: FTP PWD response parser out of bounds     read (bsc#1061876)

  - CVE-2017-1000257: IMAP FETCH response out of bounds read     (bsc#1063824) Bugs fixed :

  - Fixed error 'error:1408F10B:SSL routines' when     connecting to ftps via proxy (bsc#1060653)

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 Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3441-1 advisory.

    Daniel Stenberg discovered that curl incorrectly handled large floating point output. A remote attacker     could use this issue to cause curl to crash, resulting in a denial of service, or possibly execute     arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-9586)

    Even Rouault discovered that curl incorrectly handled large file names when doing TFTP transfers. A remote     attacker could use this issue to cause curl to crash, resulting in a denial of service, or possibly obtain     sensitive memory contents. (CVE-2017-1000100)

    Brian Carpenter and Yongji Ouyang discovered that curl incorrectly handled numerical range globbing. A     remote attacker could use this issue to cause curl to crash, resulting in a denial of service, or possibly     obtain sensitive memory contents. (CVE-2017-1000101)

    Max Dymond discovered that curl incorrectly handled FTP PWD responses. A remote attacker could use this     issue to cause curl to crash, resulting in a denial of service. (CVE-2017-1000254)

    Brian Carpenter discovered that curl incorrectly handled the --write-out command line option. A local     attacker could possibly use this issue to obtain sensitive memory contents. (CVE-2017-7407)

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.

Several vulnerabilities have been discovered in cURL, an URL transfer library. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2017-1000100     Even Rouault reported that cURL does not properly handle     long file names when doing an TFTP upload. A malicious     HTTP(S) server can take advantage of this flaw by     redirecting a client using the cURL library to a crafted     TFTP URL and trick it to send private memory contents to     a remote server over UDP.

  - CVE-2017-1000101     Brian Carpenter and Yongji Ouyang reported that cURL     contains a flaw in the globbing function that parses the     numerical range, leading to an out-of-bounds read when     parsing a specially crafted URL.

  - CVE-2017-1000254     Max Dymond reported that cURL contains an out-of-bounds     read flaw in the FTP PWD response parser. A malicious     server can take advantage of this flaw to effectively     prevent a client using the cURL library to work with it,     causing a denial of service.

New curl packages are available for Slackware 14.0, 14.1, 14.2, and
-current to fix a security issue.

It was discovered that there was a out-of-bounds read vulnerability in curl, a command-line and library for transferring data over HTTP/FTP, etc. A malicious FTP server could abuse this to prevent curl-based clients from interacting with it.

See <https://curl.haxx.se/docs/adv_20171004.html> for more details.

For Debian 7 'Wheezy', this issue has been fixed in curl version 7.26.0-1+wheezy21.

We recommend that you upgrade your curl 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 cURL project reports :

FTP PWD response parser out of bounds read

libcurl may read outside of a heap allocated buffer when doing FTP.

When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the PWD command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses.

Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path.

A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault.

ID	Name	Product	Family	Severity
206854	NewStart CGSL MAIN 6.02 : curl Multiple Vulnerabilities (NS-SA-2024-0050)	Nessus	NewStart CGSL Local Security Checks	critical
198477	RHEL 5 : curl (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
198460	RHEL 6 : curl (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
198450	RHEL 7 : curl (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
194113	RHEL 6 / 7 : httpd24 (RHSA-2018:3558)	Nessus	Red Hat Local Security Checks	critical
125003	EulerOS Virtualization 3.0.1.0 : curl (EulerOS-SA-2019-1550)	Nessus	Huawei Local Security Checks	critical
700513	macOS 10.13.x < 10.13.2 Multiple Vulnerabilities (Meltdown)	Nessus Network Monitor	Operating System Detection	critical
122260	Amazon Linux 2 : curl (ALAS-2019-1162)	Nessus	Amazon Linux Local Security Checks	critical
121761	Photon OS 2.0: Curl PHSA-2017-0045	Nessus	PhotonOS Local Security Checks	medium
121756	Photon OS 1.0: Curl PHSA-2017-0044	Nessus	PhotonOS Local Security Checks	high
118418	EulerOS Virtualization 2.5.0 : curl (EulerOS-SA-2018-1330)	Nessus	Huawei Local Security Checks	critical
105992	Fedora 27 : curl (2017-e8179c06fd)	Nessus	Fedora Local Security Checks	high
105264	GLSA-201712-04 : cURL: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
105081	macOS and Mac OS X Multiple Vulnerabilities (Security Update 2017-002 and 2017-005)	Nessus	MacOS X Local Security Checks	high
105080	macOS 10.13.x < 10.13.2 Multiple Vulnerabilities (Meltdown)	Nessus	MacOS X Local Security Checks	high
104991	SUSE SLES11 Security Update : curl (SUSE-SU-2017:3176-1)	Nessus	SuSE Local Security Checks	high
104907	EulerOS 2.0 SP2 : curl (EulerOS-SA-2017-1288)	Nessus	Huawei Local Security Checks	high
104906	EulerOS 2.0 SP1 : curl (EulerOS-SA-2017-1287)	Nessus	Huawei Local Security Checks	high
104393	Amazon Linux AMI : curl (ALAS-2017-919)	Nessus	Amazon Linux Local Security Checks	high
104236	openSUSE Security Update : curl (openSUSE-2017-1200)	Nessus	SuSE Local Security Checks	critical
104117	SUSE SLED12 / SLES12 Security Update : curl (SUSE-SU-2017:2831-1)	Nessus	SuSE Local Security Checks	critical
103895	Fedora 26 : curl (2017-601b4c20a4)	Nessus	Fedora Local Security Checks	high
103773	Ubuntu 14.04 LTS / 16.04 LTS : curl vulnerabilities (USN-3441-1)	Nessus	Ubuntu Local Security Checks	high
103715	Debian DSA-3992-1 : curl - security update	Nessus	Debian Local Security Checks	high
103703	Slackware 14.0 / 14.1 / 14.2 / current : curl (SSA:2017-279-01)	Nessus	Slackware Local Security Checks	high
103682	Debian DLA-1121-1 : curl security update	Nessus	Debian Local Security Checks	high
103666	FreeBSD : cURL -- out of bounds read (ccace707-a8d8-11e7-ac58-b499baebfeaf)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2017-1000254

high

Tenable Plugins

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