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Mozilla Foundation Security Advisory 2006-72

Title: XSS by setting img.src to javascript: URI
Impact: High
Announced: December 19, 2006
Reporter: moz_bug_r_a4
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 2.0.0.1
  Firefox 1.5.0.9
  Thunderbird 1.5.0.9
  SeaMonkey 1.0.7

Description

moz_bug_r_a4 reported that the src attribute of an IMG element loaded in a frame could be changed to a javascript: URI that was able to bypass the protections against cross-site script (XSS) injection. The injected script could steal credentials and financial data, or perform destructive actions on behalf of a logged-in user.

Workaround

Disable JavaScript until you can upgrade to a fixed version.

References

Exploit details withheld until after the active update period.