USN-2547-1: Mono vulnerabilities

24 March 2015

mono vulnerabilities

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

  • Ubuntu 14.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in Mono.

Software Description

  • mono - Mono is a platform for running and developing applications

Details

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)

Update instructions

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

Ubuntu 14.10
libmono-2.0-1 - 3.2.8+dfsg-4ubuntu2.1
mono-runtime - 3.2.8+dfsg-4ubuntu2.1
Ubuntu 14.04 LTS
libmono-2.0-1 - 3.2.8+dfsg-4ubuntu1.1
mono-runtime - 3.2.8+dfsg-4ubuntu1.1
Ubuntu 12.04 LTS
libmono-2.0-1 - 2.10.8.1-1ubuntu2.3
mono-runtime - 2.10.8.1-1ubuntu2.3

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.

References