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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -------------------------------------------------------------------------- CONECTIVA LINUX SECURITY ANNOUNCEMENT - -------------------------------------------------------------------------- PACKAGE : squid SUMMARY : ACL bypass vulnerability DATE : 2004-04-12 17:17:00 ID : CLA-2004:838 RELEVANT RELEASES : 8, 9 - ------------------------------------------------------------------------- DESCRIPTION Squid is a full-featured web proxy cache. Squid uses Access Control Lists (ACLs) to restrict access to sites or users according to certain rules. This update fixes a vulnerability[1] that allows a malicious user to bypass url_regex ACLs by using a specially crafted URL containing the characters '%00'. When interpreted by squid, only part of such a URL is considered, potentially allowing the client to access prohibited sites. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0189 to this issue[2]. Additionally, the packages for Conectiva Linux 9 are being updated to the latest stable squid version (2.5STABLE5), which includes several other fixes and improvements. One of the most notorious improvements is the inclusion of a new Access Control type called "urllogin". This new configuration directive (which is not enabled by default) can be used to protect vulnerable[3,4,5] Microsoft Internet Explorer(TM) clients from accessing some malicious and specially crafted URLs. 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/Advisories/SQUID-2004_1.txt 2.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0189 3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-1025 4.http://www.kb.cert.org/vuls/id/652278 5.http://www.microsoft.com/security/incident/spoof.asp UPDATED PACKAGES ftp://atualizacoes.conectiva.com.br/8/RPMS/squid-2.4.7-1U80_4cl.i386. rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/squid-auth-2.4.7-1U80_4cl .i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/squid-doc-2.4.7-1U80_4cl. i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/squid-templates-2.4.7-1U 80_4cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/SRPMS/squid-2.4.7-1U80_4cl.src .rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-2.5.5-25761U90_3cl .i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-auth-2.5.5-25761U9 0_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-extra-templates-2.5. 5-25761U90_3cl.i386.rpm ftp://atualizacoes.conectiva.com.br/9/SRPMS/squid-2.5.5-25761U90_3 cl.src.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@papaleguas.conectiva.com.br unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQFAevnR42jd0JmAcZARAiioAKDOCY2pZq8YXgVyTX/N/KKgvOU/OgCgqQBL B0eDumTXcHsCKE2ZlTESi7s= =cyCU -----END PGP SIGNATURE-----