[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-2.4.7-1U80_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-2.5.5-25761U90_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_3cl.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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