Researchers at INRIA and Xamarin discovered several vulnerabilities in mono, a platform for running and developing applications based on the ECMA/ISO Standards. Mono's TLS stack contained several problems that hampered its capabilities: those issues could lead to client impersonation (via SKIP-TLS), SSLv2 fallback, and encryption weakening (via FREAK).
For the stable distribution (wheezy), these problems have been fixed in version 220.127.116.11-8+deb7u1.
For the unstable distribution (sid), these problems have been fixed in version 3.2.8+dfsg-10.
We recommend that you upgrade your mono packages.