Ubuntu 12.10 USN-1713-1 Moderate: Squid-CGI Denial Of Service

ubuntu

January 31, 2013

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

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)

Topics Covered

security advisory denial of service ubuntu squid-cgi system resource issue

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.