USN-1713-1: Squid vulnerabilities

Ubuntu Security Notice USN-1713-1

30th January, 2013

squid, squid3 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 10.04 LTS

Summary

squid-cgi could consume excessive system resources, leading to a denial of service attack on it and other hosted services.

Software description

  • squid - Internet object cache (WWW proxy cache)
  • squid3 - Full featured Web Proxy cache (HTTP proxy)

Details

It was discovered that squid's cachemgr.cgi was vulnerable to excessive
resource use. A remote attacker could exploit this flaw to perform a denial
of service attack on the server and other hosted services. (CVE-2012-5643)

It was discovered that the patch for CVE-2012-5643 was incorrect. A
remote attacker could exploit this flaw to perform a denial of service
attack. (CVE-2013-0189)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 12.10:
squid-cgi 3.1.20-1ubuntu1.1
Ubuntu 12.04 LTS:
squid-cgi 3.1.19-1ubuntu3.12.04.2
Ubuntu 11.10:
squid-cgi 3.1.14-1ubuntu0.3
Ubuntu 10.04 LTS:
squid-cgi 2.7.STABLE7-1ubuntu12.6

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.
Ensure the webserver access controls properly restrict access to cachemgr.cgi.

References

CVE-2012-5643, CVE-2013-0189