The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded MPM is used, does not properly handle a %{}C format string, which allows remote attackers to cause a denial of service (daemon crash) via a cookie that lacks both a name and a value.

This update for apache2 fixes the following issues :

  - Allow disabling SNI on proxy connections using 'SetEnv     proxy-disable-sni 1' in the configuration files.
    (bsc#1052830)

  - Allow ECDH again in mod_ssl, it had been incorrectly     disabled with the 2.2.34 update. (bsc#1064561) Following     security issue has been fixed :

  - CVE-2017-9798: A use-after-free in the OPTIONS command     could be used by attackers to disclose memory of the     apache server process, when htaccess uses incorrect     Limit statement. (bsc#1058058) Additionally, references     to the following security issues, fixed by the previous     version-update of apache2 to Apache HTTPD 2.2.34 have     been added :

  - CVE-2017-7668: The HTTP strict parsing introduced a bug     in token list parsing, which allowed ap_find_token() to     search past the end of its input string. By maliciously     crafting a sequence of request headers, an attacker may     have be able to cause a segmentation fault, or to force     ap_find_token() to return an incorrect value.
    (bsc#1045061)

  - CVE-2017-3169: mod_ssl may have de-referenced a NULL     pointer when third-party modules call     ap_hook_process_connection() during an HTTP request to     an HTTPS port allowing for DoS. (bsc#1045062)

  - CVE-2017-3167: Use of the ap_get_basic_auth_pw() by     third-party modules outside of the authentication phase     may have lead to authentication requirements being     bypassed. (bsc#1045065)

  - CVE-2017-7679: mod_mime could have read one byte past     the end of a buffer when sending a malicious     Content-Type response header. (bsc#1045060)

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.

This Apache2 LTSS roll-up update for SUSE Linux Enterprise 10 SP3 LTSS fixes the following security issues and bugs :

  - CVE-2012-4557: Denial of Service via special requests in     mod_proxy_ajp

  - CVE-2012-0883: improper LD_LIBRARY_PATH handling

  - CVE-2012-2687: filename escaping problem

  - CVE-2012-0031: Fixed a scoreboard corruption (shared mem     segment) by child causes crash of privileged parent     (invalid free()) during shutdown.

  - CVE-2012-0053: Fixed an issue in error responses that     could expose 'httpOnly' cookies when no custom     ErrorDocument is specified for status code 400'.

  - The SSL configuration template has been adjusted not to     suggested weak ciphers CVE-2007-6750: The     'mod_reqtimeout' module was backported from Apache     2.2.21 to help mitigate the 'Slowloris' Denial of     Service attack.

    You need to enable the 'mod_reqtimeout' module in your     existing apache configuration to make it effective, e.g.
    in the APACHE_MODULES line in /etc/sysconfig/apache2.

  - CVE-2011-3639, CVE-2011-3368, CVE-2011-4317: This update     also includes several fixes for a mod_proxy reverse     exposure via RewriteRule or ProxyPassMatch directives.

  - CVE-2011-1473: Fixed the SSL renegotiation DoS by     disabling renegotiation by default.

  - CVE-2011-3607: Integer overflow in ap_pregsub function     resulting in a heap-based buffer overflow could     potentially allow local attackers to gain privileges

Additionally, some non-security bugs have been fixed which are listed in the changelog file.

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 Solaris system is missing necessary patches to address security updates :

  - The log_cookie function in mod_log_config.c in the     mod_log_config module in the Apache HTTP Server 2.2.17     through 2.2.21, when a threaded MPM is used, does not     properly handle a %{}C format string, which allows     remote attackers to cause a denial of service (daemon     crash) via a cookie that lacks both a name and a value.
    (CVE-2012-0021)

The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21 does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers via a malformed URI containing an initial @ (at sign) character.

The remote Redhat Enterprise Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2012:0542 advisory.

  - httpd: mod_proxy_ajp remote temporary DoS (CVE-2011-3348)

  - httpd: reverse web proxy vulnerability (CVE-2011-3368)

  - httpd: ap_pregsub Integer overflow to buffer overflow (CVE-2011-3607)

  - httpd: NULL pointer dereference crash in mod_log_config (CVE-2012-0021)

  - httpd: possible crash on shutdown due to flaw in scoreboard handling (CVE-2012-0031)

  - httpd: cookie exposure due to error responses (CVE-2012-0053)

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

This update fixes the following issues :

  - Denial of Service via special requests in mod_proxy_ajp.
    (CVE-2012-4557)

  - improper LD_LIBRARY_PATH handling. (CVE-2012-0883)

  - filename escaping problem Additionally, some     non-security bugs have been fixed:. (CVE-2012-2687)

  - ignore case when checking against SNI server names.
    [bnc#798733]

  - httpd-2.2.x-CVE-2011-3368_CVE-2011-4317-bnc722545.diff     reworked to reflect the upstream changes. This will     prevent the 'Invalid URI in request OPTIONS *' messages     in the error log. [bnc#722545]

  - new sysconfig variable APACHE_DISABLE_SSL_COMPRESSION;
    if set to on, OPENSSL_NO_DEFAULT_ZLIB will be inherited     to the apache process; openssl will then transparently     disable compression. This change affects start script     and sysconfig fillup template. Default is on, SSL     compression disabled. Please see mod_deflate for     compressed transfer at http layer. [bnc#782956]

The remote host is running a version of Mac OS X 10.7 that is older than version 10.7.5.  The newer version contains numerous security-related fixes for the following components :

  - Apache

  - BIND

  - CoreText

  - Data Security

  - ImageIO

  - Installer

  - International Components for Unicode

  - Kernel

  - Mail

  - PHP

  - Profile Manager

  - QuickLook

  - QuickTime

  - Ruby

  - USB

The remote host is running a version of Mac OS X 10.7.x that is prior to 10.7.5. The newer version contains multiple security-related fixes for the following components :

  - Apache
  - BIND
  - CoreText
  - Data Security
  - ImageIO
  - Installer
  - International Components for Unicode
  - Kernel
  - Mail
  - PHP
  - Profile Manager
  - QuickLook
  - QuickTime
  - Ruby
  - USB

The remote host is running a version of Mac OS X 10.6 that does not have Security Update 2012-004 applied. This update contains multiple security-related fixes for the following components :

  - Apache
  - Data Security
  - DirectoryService
  - ImageIO
  - International Components for Unicode
  - Mail
  - PHP
  - QuickLook
  - QuickTime
  - Ruby

According to the web server's banner, the version of HP System Management Homepage (SMH) hosted on the remote host is earlier than 7.1.1 and is, therefore, reportedly affected by the following vulnerabilities :

  - The bundled version of the libxml2 library contains     multiple vulnerabilities. (CVE-2011-1944, CVE-2011-2821,     CVE-2011-2834)

  - The bundled version of PHP contains multiple     vulnerabilities. (CVE-2011-3379, CVE-2011-4153,     CVE-2011-4885, CVE-2012-1823, CVE-2012-0057,     CVE-2012-0830)

  - The bundled version of the Apache HTTP Server contains     multiple vulnerabilities. (CVE-2011-3607, CVE-2011-4317,     CVE-2011-4415, CVE-2012-0021, CVE-2012-0031,     CVE-2012-0053)

  - An issue exists in the 'include/iniset.php' script in     the embedded RoundCube Webmail version that could lead     to a denial of service. (CVE-2011-4078)

  - The bundled version of OpenSSL contains multiple     vulnerabilities. (CVE-2011-4108, CVE-2011-4576,     CVE-2011-4577, CVE-2011-4619, CVE-2012-0027,     CVE-2012-1165)

  - The bundled version of curl and libcurl does not     properly consider special characters during extraction     of a pathname from a URL. (CVE-2012-0036)     
  - An off autocomplete attribute does not exist for     unspecified form fields, which makes it easier for     remote attackers to obtain access by leveraging an     unattended workstation. (CVE-2012-2012)

  - An unspecified vulnerability exists that could allow a     remote attacker to cause a denial of service, or     possibly obtain sensitive information or modify data.
    (CVE-2012-2013)

  - An unspecified vulnerability exists related to improper     input validation. (CVE-2012-2014)

  - An unspecified vulnerability allows remote,     unauthenticated users to gain privileges and obtain     sensitive information. (CVE-2012-2015)

  - An unspecified vulnerability allows local users to     obtain sensitive information via unknown vectors.
    (CVE-2012-2016)

The remote host is affected by the vulnerability described in GLSA-201206-25 (Apache HTTP Server: Multiple vulnerabilities)

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

    A remote attacker might obtain sensitive information, gain privileges,       send requests to unintended servers behind proxies, bypass certain       security restrictions, obtain the values of HTTPOnly cookies, or cause a       Denial of Service in various ways.
    A local attacker could gain escalated privileges.
  Workaround :

    There is no known workaround at this time.

This update contains the latest stable release of the Apace HTTP Server, version 2.2.22. This release fixes various bugs, and the following security issues :

  - Reject requests where the request-URI does not match the     HTTP specification, preventing unexpected expansion of     target URLs in some reverse proxy configurations.
    (CVE-2011-3368)

  - Fix integer overflow in ap_pregsub() which, when the     mod_setenvif module is enabled, could allow local users     to gain privileges via a .htaccess file. (CVE-2011-3607)

  - Resolve additional cases of URL rewriting with     ProxyPassMatch or RewriteRule, where particular     request-URIs could result in undesired backend network     exposure in some configurations. (CVE-2011-4317)

  - mod_log_config: Fix segfault (crash) when the     '%{cookiename}C' log format string is in use and a     client sends a nameless, valueless cookie, causing a     denial of service. The issue existed since version     2.2.17. (CVE-2012-0021)

  - Fix scoreboard issue which could allow an unprivileged     child process could cause the parent to crash at     shutdown rather than terminate cleanly. (CVE-2012-0031)

  - Fixed an issue in error responses that could expose     'httpOnly' cookies when no custom ErrorDocument is     specified for status code 400. (CVE-2012-0053)

http://www.apache.org/dist/httpd/CHANGES_2.2.22

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

It was discovered that the Apache HTTP Server incorrectly handled the SetEnvIf .htaccess file directive. An attacker having write access to a .htaccess file may exploit this to possibly execute arbitrary code.
(CVE-2011-3607)

Prutha Parikh discovered that the mod_proxy module did not properly interact with the RewriteRule and ProxyPassMatch pattern matches in the configuration of a reverse proxy. This could allow remote attackers to contact internal webservers behind the proxy that were not intended for external exposure. (CVE-2011-4317)

Rainer Canavan discovered that the mod_log_config module incorrectly handled a certain format string when used with a threaded MPM. A remote attacker could exploit this to cause a denial of service via a specially- crafted cookie. This issue only affected Ubuntu 11.04 and 11.10. (CVE-2012-0021)

It was discovered that the Apache HTTP Server incorrectly handled certain type fields within a scoreboard shared memory segment. A local attacker could exploit this to to cause a denial of service.
(CVE-2012-0031)

Norman Hippert discovered that the Apache HTTP Server incorrecly handled header information when returning a Bad Request (400) error page. A remote attacker could exploit this to obtain the values of certain HTTPOnly cookies. (CVE-2012-0053).

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

New httpd packages are available for Slackware 12.0, 12.1, 12.2, 13.0, 13.1, 13.37, and -current to fix security issues. The apr-util package has also been updated to the latest version.

Versions of Apache 2.2 earlier than 2.2.22 are potentially affected by the following vulnerabilities :

  - When configured as a reverse proxy, improper use of the RewriteRule and ProxyPasssMatch directives could cause the web server to proxy requests to arbitrary hosts.  This could allow a remote attacker to indirectly send request to intranet servers. (CVE-2011-3368, CVE-2011-4317)

  - A heap-based buffer overflow exists when mod_setenvif module is enabled and both a maliciously crafted 'SetEnvIf' directive and a maliciously crafted HTTP request header are used. (CVE-2011-3607)

  - A format string handling error can allow the server to be crashed via maliciously crafted cookies. (CVE-2012-0021)

  - An error exists in 'scoreboard.c' that can allow local attackers to crash the server during shutdown. (CVE-2012-0031)

  - An error exists in 'protocol.c' that can allow 'HTTPOnly' cookies to be exposed to attackers through the malicious use of either long or malformed HTTP headers. (CVE-2012-0053)

  - An error in the mod_proxy_ajp module when used to connect to a backend server that takes an overly long time to respond could lead to a temporary denial of service. (CVE-2012-4557)

Multiple vulnerabilities has been found and corrected in apache (ASF HTTPD) :

The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded MPM is used, does not properly handle a \%{}C format string, which allows remote attackers to cause a denial of service (daemon crash) via a cookie that lacks both a name and a value (CVE-2012-0021).

scoreboard.c in the Apache HTTP Server 2.2.21 and earlier might allow local users to cause a denial of service (daemon crash during shutdown) or possibly have unspecified other impact by modifying a certain type field within a scoreboard shared memory segment, leading to an invalid call to the free function (CVE-2012-0031).

protocol.c in the Apache HTTP Server 2.2.x through 2.2.21 does not properly restrict header information during construction of Bad Request (aka 400) error documents, which allows remote attackers to obtain the values of HTTPOnly cookies via vectors involving a (1) long or (2) malformed header in conjunction with crafted web script (CVE-2012-0053).

The updated packages have been upgraded to the latest 2.2.22 version which is not vulnerable to this issue.

Additionally APR and APR-UTIL has been upgraded to the latest versions 1.4.5 and 1.4.1 respectively which holds many improvments over the previous versions.

According to its banner, the version of Apache 2.2.x installed on the remote host is prior to 2.2.22. It is, therefore, potentially affected by the following vulnerabilities :

  - When configured as a reverse proxy, improper use of the     RewriteRule and ProxyPassMatch directives could cause     the web server to proxy requests to arbitrary hosts.
    This could allow a remote attacker to indirectly send     requests to intranet servers.
    (CVE-2011-3368, CVE-2011-4317)

  - A heap-based buffer overflow exists when mod_setenvif     module is enabled and both a maliciously crafted     'SetEnvIf' directive and a maliciously crafted HTTP     request header are used. (CVE-2011-3607)

  - A format string handling error can allow the server to     be crashed via maliciously crafted cookies.
    (CVE-2012-0021)

  - An error exists in 'scoreboard.c' that can allow local     attackers to crash the server during shutdown.
    (CVE-2012-0031)

  - An error exists in 'protocol.c' that can allow     'HTTPOnly' cookies to be exposed to attackers through     the malicious use of either long or malformed HTTP     headers. (CVE-2012-0053)

  - An error in the mod_proxy_ajp module when used to     connect to a backend server that takes an overly long     time to respond could lead to a temporary denial of     service. (CVE-2012-4557)

Note that Nessus did not actually test for these flaws, but instead has relied on the version in the server's banner.

CVE MITRE reports :

An exposure was found when using mod_proxy in reverse proxy mode. In certain configurations using RewriteRule with proxy flag or ProxyPassMatch, a remote attacker could cause the reverse proxy to connect to an arbitrary server, possibly disclosing sensitive information from internal web servers not directly accessible to attacker.

Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer overflow.

An additional exposure was found when using mod_proxy in reverse proxy mode. In certain configurations using RewriteRule with proxy flag or ProxyPassMatch, a remote attacker could cause the reverse proxy to connect to an arbitrary server, possibly disclosing sensitive information from internal web servers not directly accessible to attacker.

A flaw was found in mod_log_config. If the '%{cookiename}C' log format string is in use, a remote attacker could send a specific cookie causing a crash. This crash would only be a denial of service if using a threaded MPM.

A flaw was found in the handling of the scoreboard. An unprivileged child process could cause the parent process to crash at shutdown rather than terminate cleanly.

A flaw was found in the default error response for status code 400.
This flaw could be used by an attacker to expose 'httpOnly' cookies when no custom ErrorDocument is specified.

ID	Name	Product	Family	Severity
104270	SUSE SLES11 Security Update : apache2 (SUSE-SU-2017:2907-1) (Optionsbleed)	Nessus	SuSE Local Security Checks	critical
83578	SUSE SLES10 Security Update : apache2 (SUSE-SU-2013:0469-1)	Nessus	SuSE Local Security Checks	medium
80581	Oracle Solaris Third-Party Patch Update : apache (cve_2012_0021_improper_input)	Nessus	Solaris Local Security Checks	low
79733	F5 Networks BIG-IP : Apache HTTP server vulnerabilities (SOL15889)	Nessus	F5 Networks Local Security Checks	medium
78923	RHEL 5 / 6 : httpd (RHSA-2012:0542)	Nessus	Red Hat Local Security Checks	high
65023	SuSE 11.2 Security Update : Apache (SAT Patch Number 7409)	Nessus	SuSE Local Security Checks	medium
6583	Mac OS X 10.7 < 10.7.5 Multiple Vulnerabilities	Nessus Network Monitor	Generic	critical
62214	Mac OS X 10.7.x < 10.7.5 Multiple Vulnerabilities (BEAST)	Nessus	MacOS X Local Security Checks	critical
62213	Mac OS X Multiple Vulnerabilities (Security Update 2012-004) (BEAST)	Nessus	MacOS X Local Security Checks	critical
59851	HP System Management Homepage < 7.1.1 Multiple Vulnerabilities	Nessus	Web Servers	critical
59678	GLSA-201206-25 : Apache HTTP Server: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
58252	Fedora 15 : httpd-2.2.22-1.fc15 (2012-1642)	Nessus	Fedora Local Security Checks	medium
58050	Fedora 16 : httpd-2.2.22-1.fc16 (2012-1598)	Nessus	Fedora Local Security Checks	medium
57999	Ubuntu 8.04 LTS / 10.04 LTS / 10.10 / 11.04 / 11.10 : apache2 vulnerabilities (USN-1368-1)	Nessus	Ubuntu Local Security Checks	medium
57892	Slackware 12.0 / 12.1 / 12.2 / 13.0 / 13.1 / 13.37 / current : httpd (SSA:2012-041-01)	Nessus	Slackware Local Security Checks	medium
800552	Apache 2.2 < 2.2.22 Multiple Vulnerabilities	Log Correlation Engine	Web Servers	high
6302	Apache 2.2 < 2.2.22 Multiple Vulnerabilities	Nessus Network Monitor	Web Servers	medium
57819	Mandriva Linux Security Advisory : apache (MDVSA-2012:012)	Nessus	Mandriva Local Security Checks	medium
57791	Apache 2.2.x < 2.2.22 Multiple Vulnerabilities	Nessus	Web Servers	medium
57786	FreeBSD : apache -- multiple vulnerabilities (4b7dbfab-4c6b-11e1-bc16-0023ae8e59f0)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2012-0021

high

Tenable Plugins

critical

medium

low

medium

high

medium

critical

critical

critical

critical

high

medium

medium

medium

medium

high

medium

medium

medium

medium