Mozilla Foundation Security Advisory 2005-43
"Wrapped" javascript: urls bypass security checks
- Announced
- May 11, 2005
- Reporter
- Michael Krax, Georgi Guninski, L. David Baron
- Impact
- Critical
- Products
- Firefox, Mozilla Suite
- Fixed in
-
- Firefox 1.0.4
- Mozilla Suite 1.7.8
Description
Some security checks intended to prevent script injection were incorrect
and could be bypassed by wrapping a javascript: url in the
view-source: pseudo-protocol. Michael Krax demonstrated
that a variant of his favicon exploit
could still execute arbitrary code, and the same technique could also
be used to perform cross-site scripting.
Georgi Guninski demonstrated the same flaw wrapping javascript: urls
with the jar: pseudo-protocol.
L. David Baron discovered a nested variant that defeated checks in the script security manager.
Workaround
Disable Javascript
References
Bug and exploit details withheld until May 18, 2005