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Mozilla Foundation Security Advisory 2012-05

Title: Frame scripts calling into untrusted objects bypass security checks
Impact: Critical
Announced: January 31, 2012
Reporter: moz_bug_r_a4
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 10.0
  Thunderbird 10.0
  SeaMonkey 2.7


Mozilla security researcher moz_bug_r_a4 reported that frame scripts bypass XPConnect security checks when calling untrusted objects. This allows for cross-site scripting (XSS) attacks through web pages and Firefox extensions. The fix enables the Script Security Manager (SSM) to force security checks on all frame scripts.

Firefox 3.6 and Thunderbird 3.1 are not affected by this vulnerability.