Several security issues were fixed in Mono.
It was discovered that the Mono TLS implementation was vulnerable to the SKIP-TLS vulnerability. A remote attacker could possibly use this issue to perform client impersonation attacks. (CVE-2015-2318)
24 March 2015
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in Mono.
It was discovered that the Mono TLS implementation was vulnerable to the SKIP-TLS vulnerability. A remote attacker could possibly use this issue to perform client impersonation attacks. (CVE-2015-2318)
It was discovered that the Mono TLS implementation was vulnerable to the FREAK vulnerability. A remote attacker or a man in the middle could possibly use this issue to force the use of insecure ciphersuites. (CVE-2015-2319)
It was discovered that the Mono TLS implementation still supported a fallback to SSLv2. This update removes the functionality as use of SSLv2 is known to be insecure. (CVE-2015-2320)
It was discovered that Mono incorrectly handled memory in certain circumstances. A remote attacker could possibly use this issue to cause Mono to crash, resulting in a denial of service, or to obtain sensitive information. This issue only applied to Ubuntu 12.04 LTS. (CVE-2011-0992)
It was discovered that Mono incorrectly handled hash collisions. A remote attacker could possibly use this issue to cause Mono to crash, resulting in a denial of service. This issue only applied to Ubuntu 12.04 LTS. (CVE-2012-3543)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart Mono applications to make all the necessary changes.
Vulmon