Mozilla

Mozilla

Mozilla Foundation Security Advisory 2012-53

Content Security Policy 1.0 implementation errors cause data leakage

Announced
July 17, 2012
Reporter
Karthikeyan Bhargavan
Impact
High
Products
Firefox, Firefox ESR, SeaMonkey, Thunderbird, Thunderbird ESR
Fixed in
  • Firefox 14
  • Firefox ESR 10.0.6
  • SeaMonkey 2.11
  • Thunderbird 14
  • Thunderbird ESR 10.0.6

Description

Security researcher Karthikeyan Bhargavan of Prosecco at INRIA reported Content Security Policy (CSP) 1.0 implementation errors. CSP violation reports generated by Firefox and sent to the "report-uri" location include sensitive data within the "blocked-uri" parameter. These include fragment components and query strings even if the "blocked-uri" parameter has a different origin than the protected resource. This can be used to retrieve a user's OAuth 2.0 access tokens and OpenID credentials by malicious sites.

References