Matthew Hall discovered that Libtasn1 incorrectly handled certain large values. An attacker could exploit this with a specially crafted ASN.1 structure and cause a denial of service, or possibly execute arbitrary code. Updated packages are available from security.ubuntu.com.
========================================================================== Ubuntu Security Notice USN-1436-1 May 02, 2012 libtasn1-3 vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 12.04 LTS - Ubuntu 11.10 - Ubuntu 11.04 - Ubuntu 10.04 LTS - Ubuntu 8.04 LTS Summary: Libtasn1 could be made to crash or run programs as your login if it received specially crafted input. Software Description: - libtasn1-3: Library to manage ASN.1 structures Details: Matthew Hall discovered that Libtasn1 incorrectly handled certain large values. An attacker could exploit this with a specially crafted ASN.1 structure and cause a denial of service, or possibly execute arbitrary code. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 LTS: libtasn1-3 2.10-1ubuntu1.1 Ubuntu 11.10: libtasn1-3 2.9-4ubuntu0.1 Ubuntu 11.04: libtasn1-3 2.7-1ubuntu1.1 Ubuntu 10.04 LTS: libtasn1-3 2.4-1ubuntu0.1 Ubuntu 8.04 LTS: libtasn1-3 1.1-1ubuntu0.1 In general, a standard system update will make all the necessary changes. References: http://www.ubuntu.com/usn/usn-1436-1 CVE-2012-1569 Package Information: https://launchpad.net/ubuntu/+source/libtasn1-3/2.10-1ubuntu1.1 https://launchpad.net/ubuntu/+source/libtasn1-3/2.9-4ubuntu0.1 https://launchpad.net/ubuntu/+source/libtasn1-3/2.7-1ubuntu1.1 https://launchpad.net/ubuntu/+source/libtasn1-3/2.4-1ubuntu0.1 https://launchpad.net/ubuntu/+source/libtasn1-3/1.1-1ubuntu0.1