Multiple security issues have been found in Icedove, Debian's version of the Mozilla Thunderbird mail and news client: Multiple memory safety errors and use-after-frees may lead to the execution of arbitrary code or denial of service.
For the stable distribution (wheezy), these problems have been fixed in version 24.7.0-1~deb7u1.
For the unstable distribution (sid), these problems will be fixed soon.
We recommend that you upgrade your icedove packages.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/