ID

VAR-201110-0291

CVE

CVE-2011-3368

TITLE

Apache HTTP Server Multiple mode input validation error vulnerability

DESCRIPTION

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. Apache HTTP Server is prone to an information disclosure vulnerability. An attacker can exploit this vulnerability to gain access to sensitive information. Packages for 2009.0 are provided as of the Extended Maintenance Program. The verification of md5 checksums and GPG signatures is performed automatically for you. All packages are signed by Mandriva for security. The three CVE ids denote slightly different variants of the same issue. Note that, even with this issue fixed, it is the responsibility of the administrator to ensure that the regular expression replacement pattern for the target URI does not allow a client to append arbitrary strings to the host or port parts of the target URI. This is a violation of the privilege separation between the apache2 processes and could potentially be used to worsen the impact of other vulnerabilities. CVE-2012-0053: The response message for error code 400 (bad request) could be used to expose "httpOnly" cookies. This could allow a remote attacker using cross site scripting to steal authentication cookies. For the oldstable distribution (lenny), these problems have been fixed in version apache2 2.2.9-10+lenny12. For the stable distribution (squeeze), these problems have been fixed in version apache2 2.2.16-6+squeeze6 For the testing distribution (wheezy), these problems will be fixed in version 2.2.22-1. For the unstable distribution (sid), these problems have been fixed in version 2.2.22-1. We recommend that you upgrade your apache2 packages. The new version number for the oldstable distribution is 2.2.6-02-1+lenny7. In the stable distribution, apache2-mpm-itk has the same version number as apache2. ========================================================================== Ubuntu Security Notice USN-1259-1 November 11, 2011 apache2, apache2-mpm-itk vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 11.10 - Ubuntu 11.04 - Ubuntu 10.10 - Ubuntu 10.04 LTS - Ubuntu 8.04 LTS Summary: Multiple vulnerabilities and a regression were fixed in the Apache HTTP server. (CVE-2011-3348) Samuel Montosa discovered that the ITK Multi-Processing Module for Apache did not properly handle certain configuration sections that specify NiceValue but not AssignUserID, preventing Apache from dropping privileges correctly. This issue only affected Ubuntu 10.04 LTS, Ubuntu 10.10 and Ubuntu 11.04. (CVE-2011-1176) USN 1199-1 fixed a vulnerability in the byterange filter of Apache. The upstream patch introduced a regression in Apache when handling specific byte range requests. Original advisory details: A flaw was discovered in the byterange filter in Apache. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 11.10: apache2.2-bin 2.2.20-1ubuntu1.1 Ubuntu 11.04: apache2-mpm-itk 2.2.17-1ubuntu1.4 apache2.2-bin 2.2.17-1ubuntu1.4 Ubuntu 10.10: apache2-mpm-itk 2.2.16-1ubuntu3.4 apache2.2-bin 2.2.16-1ubuntu3.4 Ubuntu 10.04 LTS: apache2-mpm-itk 2.2.14-5ubuntu8.7 apache2.2-bin 2.2.14-5ubuntu8.7 Ubuntu 8.04 LTS: apache2.2-common 2.2.8-1ubuntu0.22 In general, a standard system update will make all the necessary changes. Here are the details from the Slackware 13.37 ChangeLog: +--------------------------+ patches/packages/apr-util-1.4.1-i486-1_slack13.37.txz: Upgraded. Version bump for httpd upgrade. patches/packages/httpd-2.2.22-i486-1_slack13.37.txz: Upgraded. *) SECURITY: CVE-2011-3368 (cve.mitre.org) Reject requests where the request-URI does not match the HTTP specification, preventing unexpected expansion of target URLs in some reverse proxy configurations. [Joe Orton] *) SECURITY: CVE-2011-3607 (cve.mitre.org) 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. [Stefan Fritsch, Greg Ames] *) SECURITY: CVE-2011-4317 (cve.mitre.org) Resolve additional cases of URL rewriting with ProxyPassMatch or RewriteRule, where particular request-URIs could result in undesired backend network exposure in some configurations. [Joe Orton] *) SECURITY: CVE-2012-0021 (cve.mitre.org) 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. PR 52256. [Eric Covener] For more information, see: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3368 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3607 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4317 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0021 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0031 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0053 (* Security fix *) +--------------------------+ Where to find the new packages: +-----------------------------+ Thanks to the friendly folks at the OSU Open Source Lab (http://osuosl.org) for donating FTP and rsync hosting to the Slackware project! :-) Also see the "Get Slack" section on http://slackware.com for additional mirror sites near you. +-----+ Slackware Linux Security Team http://slackware.com/gpg-key security@slackware.com +------------------------------------------------------------------------+ | To leave the slackware-security mailing list: | +------------------------------------------------------------------------+ | Send an email to majordomo@slackware.com with this text in the body of | | the email message: | | | | unsubscribe slackware-security | | | | You will get a confirmation message back containing instructions to | | complete the process. Please do not reply to this email address. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: httpd security and bug fix update Advisory ID: RHSA-2011:1391-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-1391.html Issue date: 2011-10-20 CVE Names: CVE-2011-3348 CVE-2011-3368 ===================================================================== 1. Summary: Updated httpd packages that fix two security issues and one bug are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch, x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64 3. It was discovered that the Apache HTTP Server did not properly validate the request URI for proxied requests. In certain configurations, if a reverse proxy used the ProxyPassMatch directive, or if it used the RewriteRule directive with the proxy flag, a remote attacker could make the proxy connect to an arbitrary server, possibly disclosing sensitive information from internal web servers not directly accessible to the attacker. (CVE-2011-3368) It was discovered that mod_proxy_ajp incorrectly returned an "Internal Server Error" response when processing certain malformed HTTP requests, which caused the back-end server to be marked as failed in configurations where mod_proxy was used in load balancer mode. A remote attacker could cause mod_proxy to not send requests to back-end AJP (Apache JServ Protocol) servers for the retry timeout period or until all back-end servers were marked as failed. (CVE-2011-3348) Red Hat would like to thank Context Information Security for reporting the CVE-2011-3368 issue. This update also fixes the following bug: * The fix for CVE-2011-3192 provided by the RHSA-2011:1245 update introduced regressions in the way httpd handled certain Range HTTP header values. This update corrects those regressions. (BZ#736592) All httpd users should upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, the httpd daemon must be restarted for the update to take effect. 4. Solution: Before applying this update, make sure all previously-released errata relevant to your system have been applied. This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259 5. Bugs fixed (http://bugzilla.redhat.com/): 736592 - httpd: RHSA-2011:1245 regressions [rhel-6] 736690 - CVE-2011-3348 httpd: mod_proxy_ajp remote temporary DoS 740045 - CVE-2011-3368 httpd: reverse web proxy vulnerability 6. Package List: Red Hat Enterprise Linux Desktop (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm i386: httpd-2.2.15-9.el6_1.3.i686.rpm httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm httpd-tools-2.2.15-9.el6_1.3.i686.rpm x86_64: httpd-2.2.15-9.el6_1.3.x86_64.rpm httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm httpd-tools-2.2.15-9.el6_1.3.x86_64.rpm Red Hat Enterprise Linux Desktop Optional (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm i386: httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm httpd-devel-2.2.15-9.el6_1.3.i686.rpm mod_ssl-2.2.15-9.el6_1.3.i686.rpm noarch: httpd-manual-2.2.15-9.el6_1.3.noarch.rpm x86_64: httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm httpd-devel-2.2.15-9.el6_1.3.i686.rpm httpd-devel-2.2.15-9.el6_1.3.x86_64.rpm mod_ssl-2.2.15-9.el6_1.3.x86_64.rpm Red Hat Enterprise Linux HPC Node (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm x86_64: httpd-2.2.15-9.el6_1.3.x86_64.rpm httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm httpd-tools-2.2.15-9.el6_1.3.x86_64.rpm Red Hat Enterprise Linux HPC Node Optional (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm noarch: httpd-manual-2.2.15-9.el6_1.3.noarch.rpm x86_64: httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm httpd-devel-2.2.15-9.el6_1.3.i686.rpm httpd-devel-2.2.15-9.el6_1.3.x86_64.rpm mod_ssl-2.2.15-9.el6_1.3.x86_64.rpm Red Hat Enterprise Linux Server (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm i386: httpd-2.2.15-9.el6_1.3.i686.rpm httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm httpd-devel-2.2.15-9.el6_1.3.i686.rpm httpd-tools-2.2.15-9.el6_1.3.i686.rpm mod_ssl-2.2.15-9.el6_1.3.i686.rpm noarch: httpd-manual-2.2.15-9.el6_1.3.noarch.rpm ppc64: httpd-2.2.15-9.el6_1.3.ppc64.rpm httpd-debuginfo-2.2.15-9.el6_1.3.ppc.rpm httpd-debuginfo-2.2.15-9.el6_1.3.ppc64.rpm httpd-devel-2.2.15-9.el6_1.3.ppc.rpm httpd-devel-2.2.15-9.el6_1.3.ppc64.rpm httpd-tools-2.2.15-9.el6_1.3.ppc64.rpm mod_ssl-2.2.15-9.el6_1.3.ppc64.rpm s390x: httpd-2.2.15-9.el6_1.3.s390x.rpm httpd-debuginfo-2.2.15-9.el6_1.3.s390.rpm httpd-debuginfo-2.2.15-9.el6_1.3.s390x.rpm httpd-devel-2.2.15-9.el6_1.3.s390.rpm httpd-devel-2.2.15-9.el6_1.3.s390x.rpm httpd-tools-2.2.15-9.el6_1.3.s390x.rpm mod_ssl-2.2.15-9.el6_1.3.s390x.rpm x86_64: httpd-2.2.15-9.el6_1.3.x86_64.rpm httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm httpd-devel-2.2.15-9.el6_1.3.i686.rpm httpd-devel-2.2.15-9.el6_1.3.x86_64.rpm httpd-tools-2.2.15-9.el6_1.3.x86_64.rpm mod_ssl-2.2.15-9.el6_1.3.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm i386: httpd-2.2.15-9.el6_1.3.i686.rpm httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm httpd-devel-2.2.15-9.el6_1.3.i686.rpm httpd-tools-2.2.15-9.el6_1.3.i686.rpm mod_ssl-2.2.15-9.el6_1.3.i686.rpm noarch: httpd-manual-2.2.15-9.el6_1.3.noarch.rpm x86_64: httpd-2.2.15-9.el6_1.3.x86_64.rpm httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm httpd-devel-2.2.15-9.el6_1.3.i686.rpm httpd-devel-2.2.15-9.el6_1.3.x86_64.rpm httpd-tools-2.2.15-9.el6_1.3.x86_64.rpm mod_ssl-2.2.15-9.el6_1.3.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/#package 7. References: https://www.redhat.com/security/data/cve/CVE-2011-3348.html https://www.redhat.com/security/data/cve/CVE-2011-3368.html https://access.redhat.com/security/updates/classification/#moderate https://rhn.redhat.com/errata/RHSA-2011-1245.html 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2011 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFOoFwtXlSAg2UNWIIRArNFAJ4wl+RBSDavBY4s30osXuQolAExpgCfdnq4 jqEdmfFTEkx4L2vdRBd3Ux8= =yDza -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . When using the RewriteRule or ProxyPassMatch directives to configure a reverse proxy using a pattern match, it is possible to inadvertently expose internal servers to remote users who send carefully crafted requests. The server did not validate that the input to the pattern match was a valid path string, so a pattern could expand to an unintended target URL. The documentation has been updated to reflect the more general risks with pattern matching in a reverse proxy configuration. Details: ======== A configuration like one of the following examples: RewriteRule (.*)\.(jpg|gif|png) http://images.example.com$1.$2 [P] ProxyPassMatch (.*)\.(jpg|gif|png) http://images.example.com$1.$2 could result in an exposure of internal servers. A request of the form: GET @other.example.com/something.png HTTP/1.1 would get translated to a target of: http://images.example.com@other.example.com/something.png This will cause the proxy to connect to the hostname "other.example.com", as the "images.example.com@" segment would be treated as user credentials when parsing the URL. This would allow a remote attacker the ability to proxy to hosts other than those expected, which could be a security exposure in some circumstances. The request-URI string in this example, "@other.example.com/something.png", is not valid according to the HTTP specification, since it neither an absolute URI ("http://example.com/path") nor an absolute path ("/path"). For future releases, the server has been patched to reject such requests, instead returning a "400 Bad Request" error. Actions: ======== Apache HTTPD users should examine their configuration files to determine if they have used an insecure configuration for reverse proxying. Affected users can update their configuration, or apply the patch from: http://www.apache.org/dist/httpd/patches/apply_to_2.2.21/ For example, the above RewriteRule could be changed to: RewriteRule /(.*)\.(jpg|gif|png) http://images.example.com/$1.$2 [P] to ensure the pattern only matches against paths with a leading "/". Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/ . (CVE-2011-3348) The httpd server included the full HTTP header line in the default error page generated when receiving an excessively long or malformed header. Malicious JavaScript running in the server's domain context could use this flaw to gain access to httpOnly cookies. (CVE-2012-0053) An integer overflow flaw, leading to a heap-based buffer overflow, was found in the way httpd performed substitutions in regular expressions. An attacker able to set certain httpd settings, such as a user permitted to override the httpd configuration for a specific directory using a ".htaccess" file, could use this flaw to crash the httpd child process or, possibly, execute arbitrary code with the privileges of the "apache" user. (CVE-2011-3607) A NULL pointer dereference flaw was found in the httpd mod_log_config module. In configurations where cookie logging is enabled, a remote attacker could use this flaw to crash the httpd child process via an HTTP request with a malformed Cookie header. (CVE-2012-0021) A flaw was found in the way httpd handled child process status information. A malicious program running with httpd child process privileges (such as a PHP or CGI script) could use this flaw to cause the parent httpd process to crash during httpd service shutdown

AFFECTED PRODUCTS