Squid: Multiple vulnerabilities

1.  Gentoo Linux Security Advisory

Version Information

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

Synopsis

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

Background

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.

Description

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).

Impact

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

Workaround

There is no known workaround at this time.

Resolution

All Squid users should upgrade to the latest version:

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

4.  References

• CAN-2005-0173
• CAN-2005-0174
• CAN-2005-0175
• CAN-2005-0211