Download Firefox

Firefox is no longer supported on Windows 8.1 and below.

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

Download Firefox ESR 64-bit

Download Firefox ESR 32-bit

Download a different build

Firefox is no longer supported on macOS 10.14 and below.

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

Download Firefox ESR
Firefox Privacy Notice
Get Mozilla VPN

Mozilla Foundation Security Advisory 2006-44

Code execution through deleted frame reference

Announced
July 25, 2006
Reporter
Thilo Girmann
Impact
Critical
Products
Firefox, SeaMonkey
Fixed in
  • Firefox 1.5.0.5
  • SeaMonkey 1.0.3

Description

Thilo Girmann discovered that in certain circumstances a JavaScript reference to a frame or window was not properly cleared when the referenced content went away, and he demonstrated that this pointer to a deleted object could be used to execute native code supplied by the attacker.

This vulnerability was introduced during Firefox 1.5 development, it does not affect Firefox 1.0 or Mozilla Suite 1.7

Thunderbird shares the browser engine with Firefox and would be vulnerable if JavaScript were to be enabled in mail. This is not the default setting and we strongly discourage users from enabling JavaScript in mail.

Workaround

Disable JavaScript until you can upgrade to a fixed version. Do not enable JavaScript in mail clients such as Thunderbird.

References

Exploit details withheld until after the active update period.