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Firefox Privacy Notice

Mozilla Foundation Security Advisory 2007-09

Privilege escalation by setting img.src to javascript: URI

Announced
March 5, 2007
Reporter
moz_bug_r_a4
Impact
Critical
Products
Firefox, SeaMonkey
Fixed in
  • Firefox 1.5.0.10
  • Firefox 2.0.0.2
  • SeaMonkey 1.0.8
  • SeaMonkey 1.1.1

Description

moz_bug_r_a4 reports that the fix for MFSA 2006-72 in Firefox 1.5.0.9 and Firefox 2.0.0.1 introduced a regression that allows scripts from web content to execute arbitrary code by setting the src attribute of an IMG tag to a specially crafted javascript: URI.

The same regression also caused javascript: URIs in IMG tags to be executed even if JavaScript execution was disabled in the global preferences. This facet was noted by moz_bug_r_a4 and reported independently by Anbo Motohiko.

Thunderbird is not affected by this flaw as it will not execute javascript: URIs in IMG tags.

Workaround

Upgrade to a version containing the fix. Disabling JavaScript does not protect against this flaw.

References