icedove - several

Multiple security issues have been found in Icedove, Debian’s version of
the Mozilla Thunderbird mail and news client. Multiple memory safety
errors, missing permission checks and other implementation errors may
lead to the execution of arbitrary code or cross-site scripting.

The Icedove version in the oldstable distribution (squeeze) is no longer
supported with full security updates. However, it should be noted that
almost all security issues in Icedove stem from the included browser engine.
These security problems only affect Icedove if scripting and HTML mails
are enabled. If there are security issues specific to Icedove (e.g. a
hypothetical buffer overflow in the IMAP implementation) we’ll make an
effort to backport such fixes to oldstable.

For the stable distribution (wheezy), these problems have been fixed in
version 17.0.8-1~deb7u1.

For the unstable distribution (sid), these problems have been fixed in
version 17.0.8-1.

We recommend that you upgrade your icedove packages.