Multiple security issues have been found in Iceweasel, Debian's version of the Mozilla Firefox web browser: 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 24.7.0esr-1~deb7u1.
For the unstable distribution (sid), these problems have been fixed in version 31.0-1.
We recommend that you upgrade your iceweasel packages.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: http://www.debian.org/security/