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Squid: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200502-04 / squid
Release Date February 02, 2005
Latest Revision February 02, 2005: 02
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-proxy/squid < 2.5.7-r5 >= 2.5.7-r5 All supported architectures

Related bugreports: #79495, #78776, #80201, #80341


Squid contains vulnerabilities in the code handling WCCP, HTTP and LDAP which could lead to Denial of Service, access control bypass, web cache and log poisoning.

2.  Impact Information


Squid is a full-featured Web proxy cache designed to run on Unix systems. It supports proxying and caching of HTTP, FTP, and other protocols, as well as SSL support, cache hierarchies, transparent caching, access control lists and many other features.


Squid contains several vulnerabilities:

  • Buffer overflow when handling WCCP recvfrom() (CAN-2005-0211).
  • Loose checking of HTTP headers (CAN-2005-0173 and CAN-2005-0174).
  • Incorrect handling of LDAP login names with spaces (CAN-2005-0175).


An attacker could exploit:

  • the WCCP buffer overflow to cause Denial of Service.
  • the HTTP header parsing vulnerabilities to inject arbitrary response data, potentially leading to content spoofing, web cache poisoning and other cross-site scripting or HTTP response splitting attacks.
  • the LDAP issue to login with several variations of the same login name, leading to log poisoning.

3.  Resolution Information


There is no known workaround at this time.


All Squid users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-proxy/squid-2.5.7-r5"

4.  References


Page updated February 02, 2005

Summary: This is a Gentoo Linux Security Advisory

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