It was discovered that telepathy-gabble, the Jabber/XMPP connection manager for the Telepathy framework, is processing google:jingleinfo updates without validating their origin. This may allow an attacker to trick telepathy-gabble into relaying streamed media data through a server of his choice and thus intercept audio and video calls.
For the oldstable distribution (lenny), this problem has been fixed in version 0.7.6-1+lenny1.
For the stable distribution (squeeze), this problem has been fixed in version 0.9.15-1+squeeze1.
For the testing (wheezy) and unstable (sid) distributions, this problem will be fixed soon.
We recommend that you upgrade your telepathy-gabble packages.