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==========================================================================Ubuntu Security Notice USN-1713-1
January 31, 2013

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

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 versions:

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

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

References:
  http://www.ubuntu.com/usn/usn-1713-1
  CVE-2012-5643, CVE-2013-0189

Package Information:
  https://launchpad.net/ubuntu/+source/squid3/3.1.20-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/squid3/3.1.19-1ubuntu3.12.04.2
  https://launchpad.net/ubuntu/+source/squid3/3.1.14-1ubuntu0.3
  https://launchpad.net/ubuntu/+source/squid/2.7.STABLE7-1ubuntu12.6