[CLA-2005:931] Conectiva Security Announcement - squid
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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : squid
SUMMARY : Fixes for multiple squid vulnerabilities
DATE : 2005-03-08 10:06:00
ID : CLA-2005:931
RELEVANT
RELEASES : 9, 10
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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
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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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