1. Ubuntu Security Notices
  2. USN-2547-1

USN-2547-1: Mono vulnerabilities

Publication date

24 March 2015

Overview

Several security issues were fixed in Mono.

Releases

Packages

  • 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 machine-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...

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 machine-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

After a standard system update you need to restart Mono applications to make all the necessary changes.

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
14.10 utopic libmono-2.0-1 –  3.2.8+dfsg-4ubuntu2.1
mono-runtime –  3.2.8+dfsg-4ubuntu2.1
14.04 trusty libmono-2.0-1 –  3.2.8+dfsg-4ubuntu1.1
mono-runtime –  3.2.8+dfsg-4ubuntu1.1
12.04 precise libmono-2.0-1 –  2.10.8.1-1ubuntu2.3
mono-runtime –  2.10.8.1-1ubuntu2.3

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References

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