Red Hat Security Advisory 2012-1089-01 - Mozilla Thunderbird is a standalone mail and newsgroup client. Several flaws were found in the processing of malformed content. Malicious content could cause Thunderbird to crash or, potentially, execute arbitrary code with the privileges of the user running Thunderbird. Malicious content could bypass same-compartment security wrappers and execute arbitrary code with chrome privileges.
6f1030b3c007e92dee24f9f260950788c90e7f4630f1be858306ba2fad1bbd72