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Date: Tue, 8 Mar 2005 10:08:10 -0300 From: Conectiva Updates <secure@...ectiva.com.br> To: conectiva-updates@...aleguas.conectiva.com.br, lwn@....net, bugtraq@...urityfocus.com, security-alerts@...uxsecurity.com, linsec@...ts.seifried.org Subject: [CLA-2005:931] Conectiva Security Announcement - squid -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -------------------------------------------------------------------------- CONECTIVA LINUX SECURITY ANNOUNCEMENT - -------------------------------------------------------------------------- PACKAGE : squid SUMMARY : Fixes for multiple squid vulnerabilities DATE : 2005-03-08 10:06:00 ID : CLA-2005:931 RELEVANT RELEASES : 9, 10 - ------------------------------------------------------------------------- DESCRIPTION Squid[1] is a full-featured web proxy cache. This announcement fixes the following vulnerabilities for Squid: 1.Strengthen Squid from HTTP response splitting cache pollution attack[2] This patch additionaly strengthens Squid from the HTTP response splitting cache pollution attack described by Sanctum. 2.Reject malformed HTTP requests and responses that conflict with the HTTP specifications[3] This patch makes Squid considerably stricter while parsing the HTTP protocol and also adds a new relaxed_header_parser directive which defaults to on. If set off Squid will become really strict about CR characters and whitespace in header names, while in the default on setting Squid will ignore (and automatically clean up) common deviations from these parts of the HTTP specification. 3.Correct handling of oversized reply headers[4] This patch addresses a HTTP protocol mismatch related to oversized reply headers. In addition it enhances the cache.log reporting on reply header parsing failures to make it easier to track down which sites are malfunctioning. 4.Segmentation fault on failed PUT/POST request[5] An inconsistent state is entered on a failed PUT/POST request making a high risk for segmentation faults or other strange errors. 5.Data corruption when HTTP reply headers is split in several packets[6] Under certain conditions involving HTTP headers split over multiple reply packets the HTTP reply may be corrupted by Squid. Symptoms range from hanging requests to corrupted data or error messages about the reply sent to the clients (usually "httpProcessReplyHeader: Too large reply header"). 6.Assertion failure on certain odd DNS responses[7] Squid may abort with "xstrndup: Asserton 'n' failed" or other errors when receiving certain odd DNS responses. For Conectiva Linux 9, the Squid package has been merged with Conectiva Linux 10 package, since both used the same base version. SOLUTION It is recommended that all squid users upgrade to the latest packages. This update will automatically restart the service if it is already running. REFERENCES 1.http://www.squid-cache.org/ 2.http://www1.uk.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-response_splitting 3.http://www1.uk.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-header_parsing 4.http://www1.uk.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-oversize_reply_headers 5.http://www1.uk.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-post 6.http://www1.uk.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE7-split_headers 7.http://www1.uk.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE8-dns_assert UPDATED PACKAGES ftp://atualizacoes.conectiva.com.br/10/SRPMS/squid-2.5.5-63116U10_8cl.src.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/squid-2.5.5-63116U10_8cl.i386.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/squid-auth-2.5.5-63116U10_8cl.i386.rpm ftp://atualizacoes.conectiva.com.br/10/RPMS/squid-extra-templates-2.5.5-63116U10_8cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/SRPMS/squid-2.5.5-76327U90_10cl.src.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-2.5.5-76327U90_10cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-auth-2.5.5-76327U90_10cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-extra-templates-2.5.5-76327U90_10cl.i386.rpm ADDITIONAL INSTRUCTIONS The apt tool can be used to perform RPM packages upgrades: - run: apt-get update - after that, execute: apt-get upgrade Detailed instructions regarding the use of apt and upgrade examples can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en - ------------------------------------------------------------------------- All packages are signed with Conectiva's GPG key. The key and instructions on how to import it can be found at http://distro.conectiva.com.br/seguranca/chave/?idioma=en Instructions on how to check the signatures of the RPM packages can be found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en - ------------------------------------------------------------------------- All our advisories and generic update instructions can be viewed at http://distro.conectiva.com.br/atualizacoes/?idioma=en - ------------------------------------------------------------------------- Copyright (c) 2004 Conectiva Inc. http://www.conectiva.com - ------------------------------------------------------------------------- subscribe: conectiva-updates-subscribe@...aleguas.conectiva.com.br unsubscribe: conectiva-updates-unsubscribe@...aleguas.conectiva.com.br -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQFCLaO542jd0JmAcZARArThAKDmts3LxHasUiDUh2L0Mdboo5Cz4ACdFX71 M56W3VXviSCrFe0g/Tk4okc= =85JZ -----END PGP SIGNATURE-----
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