Mozilla Foundation Security Advisory 2014-07
XSLT stylesheets treated as styles in Content Security Policy
- Announced
- February 4, 2014
- Reporter
- Frederik Braun
- Impact
- Moderate
- Products
- Firefox, SeaMonkey
- Fixed in
-
- Firefox 27
- SeaMonkey 2.24
Description
Mozilla security engineer Frederik Braun reported an issue
where the implementation of Content Security Policy (CSP) is not in compliance
with the specification. XSLT stylesheets
must be subject to script-src directives but Mozilla's
implementation of CSP treats them as styles. This could lead to unexpected
script execution if the style-src directives were less restrictive
than those for scripts.
In general this flaw cannot be exploited through email in the Seamonkey product because scripting is disabled in mail, but is potentially a risk in browser or browser-like contexts.