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 24.8.0esr-1~deb7u1.
For the unstable distribution (sid), these problems have been fixed in
version 31.1.0esr-1.
We recommend that you upgrade your iceweasel packages.