A content security policy (CSP) "frame-ancestors" directive containing origins with paths allows for comparisons against those paths instead of the origin. This results in a cross-origin information leak of this path information. This vulnerability affects Firefox < 55.
{ "binaries": [ { "binary_version": "55.0.1+build2-0ubuntu0.14.04.2", "binary_name": "firefox" }, { "binary_version": "55.0.1+build2-0ubuntu0.14.04.2", "binary_name": "firefox-dev" }, { "binary_version": "55.0.1+build2-0ubuntu0.14.04.2", "binary_name": "firefox-globalmenu" }, { "binary_version": "55.0.1+build2-0ubuntu0.14.04.2", "binary_name": "firefox-mozsymbols" }, { "binary_version": "55.0.1+build2-0ubuntu0.14.04.2", "binary_name": "firefox-testsuite" } ], "availability": "No subscription required" }
{ "binaries": [ { "binary_version": "55.0.1+build2-0ubuntu0.16.04.2", "binary_name": "firefox" }, { "binary_version": "55.0.1+build2-0ubuntu0.16.04.2", "binary_name": "firefox-dev" }, { "binary_version": "55.0.1+build2-0ubuntu0.16.04.2", "binary_name": "firefox-globalmenu" }, { "binary_version": "55.0.1+build2-0ubuntu0.16.04.2", "binary_name": "firefox-mozsymbols" }, { "binary_version": "55.0.1+build2-0ubuntu0.16.04.2", "binary_name": "firefox-testsuite" } ], "availability": "No subscription required" }