Security researcher Aki Helin used the Address Sanitizer tool to find a buffer overflow during video playback on Linux systems. This was due to a problem in older versions of the Gstreamer plugin during the parsing of H.264 formatted video. This issue could be used to induce a possibly exploitable crash. This issue does not affect the current 1.0 version of Gstreamer and does not affect Windows or OS X systems. External Reference: http://www.mozilla.org/security/announce/2015/mfsa2015-47.html Acknowledgements: Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Aki Helin as the original reporter.
This issue has been addressed in the following products: Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 5 Via RHSA-2015:0988 https://rhn.redhat.com/errata/RHSA-2015-0988.html
Firefox addresses this issue by blacklisting the affected H.264 video plugin. So even if target system has a vulnerable version of Gstreamer plugin, this issue cannot be exploited remotely by using malicious web content via firefox. The corresponding gstreamer bug for this issue is: https://bugzilla.redhat.com/show_bug.cgi?id=1210567