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TUCoPS :: Linux :: Conectiva :: hack3572.htm

squid vulnerability



[CLA-2004:838] Conectiva Security Announcement - squid

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CONECTIVA LINUX SECURITY ANNOUNCEMENT 
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PACKAGE   : squid
SUMMARY   : ACL bypass vulnerability
DATE      : 2004-04-12 17:17:00
ID        : CLA-2004:838
RELEVANT
RELEASES  : 8, 9

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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 

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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 

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All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en 

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Copyright (c) 2004 Conectiva Inc.
http://www.conectiva.com 

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