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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.0249 Moderate: squid security and bug fix update 22 February 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: squid Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 6 Red Hat Enterprise Linux WS/Desktop 6 Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2012-5643 Reference: ESB-2012.1199.2 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2013-0505.html - --------------------------BEGIN INCLUDED TEXT-------------------- ===================================================================== Red Hat Security Advisory Synopsis: Moderate: squid security and bug fix update Advisory ID: RHSA-2013:0505-02 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-0505.html Issue date: 2013-02-21 CVE Names: CVE-2012-5643 ===================================================================== 1. Summary: Updated squid packages that fix one security issue and several bugs are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64 3. Description: Squid is a high-performance proxy caching server for web clients that supports FTP, Gopher, and HTTP data objects. A denial of service flaw was found in the way the Squid Cache Manager processed certain requests. A remote attacker who is able to access the Cache Manager CGI could use this flaw to cause Squid to consume an excessive amount of memory. (CVE-2012-5643) This update also fixes the following bugs: * Due to a bug in the ConnStateData::noteMoreBodySpaceAvailable() function, child processes of Squid terminated upon encountering a failed assertion. An upstream patch has been provided and Squid child processes no longer terminate. (BZ#805879) * Due to an upstream patch, which renamed the HTTP header controlling persistent connections from "Proxy-Connection" to "Connection", the NTLM pass-through authentication does not work, thus preventing login. This update adds the new "http10" option to the squid.conf file, which can be used to enable the change in the patch. This option is set to "off" by default. When set to "on", the NTLM pass-through authentication works properly, thus allowing login attempts to succeed. (BZ#844723) * When the IPv6 protocol was disabled and Squid tried to handle an HTTP GET request containing an IPv6 address, the Squid child process terminated due to signal 6. This bug has been fixed and such requests are now handled as expected. (BZ#832484) * The old "stale if hit" logic did not account for cases where the stored stale response became fresh due to a successful re-validation with the origin server. Consequently, incorrect warning messages were returned. Now, Squid no longer marks elements as stale in the described scenario. (BZ#847056) * When squid packages were installed before samba-winbind, the wbpriv group did not include Squid. Consequently, NTLM authentication calls failed. Now, Squid correctly adds itself into the wbpriv group if samba-winbind is installed before Squid, thus fixing this bug. (BZ#797571) * In FIPS mode, Squid was using private MD5 hash functions for user authentication and network access. As MD5 is incompatible with FIPS mode, Squid could fail to start. This update limits the use of the private MD5 functions to local disk file hash identifiers, thus allowing Squid to work in FIPS mode. (BZ#833086) * Under high system load, the squid process could terminate unexpectedly with a segmentation fault during reboot. This update provides better memory handling during reboot, thus fixing this bug. (BZ#782732) * Squid incorrectly set the timeout limit for client HTTP connections with the value for server-side connections, which is much higher, thus creating unnecessary delays. With this update, Squid uses a proper value for the client timeout limit. (BZ#798090) * Squid did not properly release allocated memory when generating error page contents, which caused memory leaks. Consequently, the Squid proxy server consumed a lot of memory within a short time period. This update fixes this memory leak. (BZ#758861) * Squid did not pass the ident value to a URL rewriter that was configured using the "url_rewrite_program" directive. Consequently, the URL rewriter received the dash character ("") as the user value instead of the correct user name. Now, the URL rewriter receives the correct user name in the described scenario. (BZ#797884) * Squid, used as a transparent proxy, can only handle the HTTP protocol. Previously, it was possible to define a URL in which the access protocol contained the asterisk character (*) or an unknown protocol namespace URI. Consequently, an "Invalid URL" error message was logged to access.log during reload. This update ensures that "http://" is always used in transparent proxy URLs, and the error message is no longer logged in this scenario. (BZ#720504) All users of squid are advised to upgrade to these updated packages, which fix these issues. After installing this update, the squid service will be restarted automatically. 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/knowledge/articles/11258 5. Bugs fixed (http://bugzilla.redhat.com/): 797571 - squid userid not added to wbpriv group 798090 - client timeout uses server-side "read_timeout", not "request_timeout" 832484 - Squid exits due to signal 6 when IPv6 is disabled and HTTP GET request contains IPv6 address 833086 - squid uses a private md5 hash function for user auth, bypassing FIPS 140-2 restrictions 844723 - The NTLM pass-through authentication doesn't work via squid-3.1.10 847056 - squid incorrectly marks elements as stale when the client uses If-Modified-Since and If-None-Match headers 887962 - CVE-2012-5643 squid: cachemgr.cgi memory usage DoS and memory leaks 6. Package List: Red Hat Enterprise Linux Server (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/... i386: squid-3.1.10-16.el6.i686.rpm squid-debuginfo-3.1.10-16.el6.i686.rpm ppc64: squid-3.1.10-16.el6.ppc64.rpm squid-debuginfo-3.1.10-16.el6.ppc64.rpm s390x: squid-3.1.10-16.el6.s390x.rpm squid-debuginfo-3.1.10-16.el6.s390x.rpm x86_64: squid-3.1.10-16.el6.x86_64.rpm squid-debuginfo-3.1.10-16.el6.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Worksta... i386: squid-3.1.10-16.el6.i686.rpm squid-debuginfo-3.1.10-16.el6.i686.rpm x86_64: squid-3.1.10-16.el6.x86_64.rpm squid-debuginfo-3.1.10-16.el6.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-2012-5643.html https://access.redhat.com/security/updates/classification... https://access.redhat.com/knowledge/docs/en-US/Red_Hat_En... 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2013 Red Hat, Inc. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUSblU+4yVqjM2NGpAQKo4Q/9Gr7zwcuJSx55dhqARmlp6b/85Adk4XNH VXvGuHVY+3lqETu9WqMHGi3cGcAYj1bKrHxPc3MsbYdPM9UayBF2BKK/j0sXox/z vZY17KMJ7DJNWPmqZMODD7fk76nVdWKzNVbfge7XZIGFJpE2CQMKrV8qWCOofrIN l5iCyItlyuqr7SLg4W9GKVA7LTJSPBsXDUhxggGM15XfjomFyLgdn3yZOcvGBYUN iLmelpxj4CXkKbNEe2cv4IKcIsjbGNf4Sqd8rIxv9O2T46LxusyjP+JusQBLVwed 1MqgqxN0j/0ivDFFQ4MDVV40dABZsNwlZam6UvQvN3+W8bRMS3eNuEHrPvdyThDC NsdTUVhNHBXNE8cFrlcTlKQBsADrZaiaTXgkIxXZ5+In5d1iCnDsi22MFbOIB4Ja TLpoUajgZ9FCNASRScp6VCCvt8gY7k138uPK53cnRdveDvyhJYdQ2E6nv6tOOyJw 5pwT3eKiitqk0Mb5nts9xeyUYx20tmbemTzKiJeyuokxxQ//VHxoO1h3VY3+T2bF EWNGOvtNaWRIiojwyB2j3jkcbc0bt3ZLcfmk6RxbP3Lfcp5HydLL0L6rToLZ+wlZ js/7RaEVrF+mKFrolH9wQ5mtlIYkDa03ovzLWibCb9TiqavFe7Rb5dsMYrcXaLnq OwUtbsROuXQ= =PS5c -----END PGP SIGNATURE-----