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Mozilla Foundation Security Advisory 2015-91

Mozilla Content Security Policy allows for asterisk wildcards in violation of CSP specification

August 11, 2015
Christoph Kerschbaumer
Firefox, SeaMonkey
Fixed in
  • Firefox 40
  • SeaMonkey 2.38


Mozilla security engineer Christoph Kerschbaumer reported a discrepancy in Mozilla's implementation of Content Security Policy and the CSP specification. The specification states that blob:, data:, and filesystem: URLs should be excluded in case of a wildcard when matching source expressions but Mozilla's implementation allows these in the case of an asterisk wildcard. This could allow for more permissive CSP usage than expected by a web developer, possibly allowing for cross-site scripting (XSS) attacks.