Package Instance

Mozilla developer Olli Pettay reported that while
investigating Mozilla
Foundation Security Advisory 2015-28, he and Mozilla developer Boris
Zbarsky found an alternate way to trigger a similar vulnerability. The
previously reported flaw used an issue with SVG content navigation to bypass
same-origin policy protections to run scripts in a privileged context. This
newer variant found that the same flaw could be used during anchor navigation of
a page, allowing bypassing of same-origin policy protections. 
In general this flaw cannot be exploited through email in the
Thunderbird product because scripting is disabled, but is potentially a risk in
browser or browser-like contexts.

Security researcher Mariusz Mlynski reported, through HP
Zero Day Initiative's Pwn2Own contest, that documents loaded though a
resource: URL, such as Mozilla's PDF.js PDF file
viewer, were able to subsequently load privileged chrome pages. The privilege
restrictions on resource: URLs was handled incorrectly and these
restrictions could be bypassed if this flaw was combined with a separate
vulnerability allowing for same-origin policy violation, it could be used to run
arbitrary code.
In general this flaw cannot be exploited through email in the
Thunderbird product because scripting is disabled, but is potentially a risk in
browser or browser-like contexts.

Mozilla developers and community identified and fixed several memory safety
bugs in the browser engine used in Firefox and other Mozilla-based products.
Some of these bugs showed evidence of memory corruption under certain
circumstances, and we presume that with enough effort at least some of these
could be exploited to run arbitrary code.In general these flaws cannot be exploited through email in the
Thunderbird product because scripting is disabled, but are potentially a risk in
browser or browser-like contexts.

Mozilla developer Christoph Kerschbaumer discovered an issue
while investigating Mozilla
Foundation Security Advisory 2015-03, previously reported by security
researcher Muneaki Nishimura. This flaw was that a cross-origin
resource sharing (CORS) request should not follow 30x redirections after
preflight according to the specification. This only affects
sendBeacon() requests but could allow for a potential Cross-site
request forgery (XSRF) attack from malicious websites. 
In general this flaw cannot be exploited through email in the
Thunderbird product because scripting is disabled, but is potentially a risk in
browser or browser-like contexts.

Security researcher Aki Helin reported a use-after-free when
playing certain MP3 format audio files on the web using the Fluendo MP3 plugin
for GStreamer on Linux. This is due to a flaw in handling certain MP3 files by
the plugin and its interaction with Mozilla code. This can lead to a potentially
exploitable crash.
This flaw only affects Linux installations. Windows and OS X
users are unaffected by it.