Download Firefox

Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox Privacy Notice

Mozilla Foundation Security Advisory 2015-107

Out-of-bounds read during 2D canvas display on Linux 16-bit color depth systems

Announced
September 22, 2015
Reporter
Francisco Alonso
Impact
Moderate
Products
Firefox, SeaMonkey
Fixed in
  • Firefox 41
  • SeaMonkey 2.38

Description

Security researcher Francisco Alonso of the NowSecure Research Team used the Address Sanitizer tool to discover an out-of-bounds read issue during 2D canvas rendering. This was due to an issue in the cairo graphics library when surfaces are created with 32-bit color depth but displayed on a 16-bit color depth system, which is unsupported. This allows an attacker to read an amount of random memory following the heap for the 16-bit surface leading to information disclosure.

This issue is specific to Linux in certain configurations and does not affect Windows or OS X systems.

References