Red Hat Bugzilla – Bug 1291599
CVE-2015-7223 Mozilla: Privilege escalation vulnerabilities in WebExtension APIs (MFSA 2015-148)
Last modified: 2015-12-16 04:04:20 EST
Mozilla developer Kris Maglione reported a mechanism where WebExtension APIs could be used to escalate privilege. This could allow arbitrary web content to execute code with the privileges of a particular WebExtension when using these API calls. Depending on the privileges of the extension used, this could result in personal information theft and cross-site scripting (XSS) attacks, including theft of browser cookies. This is mitigated by the requirement to have a WebExtension installed that is vulnerable to this issue.
Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Kris Maglione as the original reporter.
This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5, 6 and 7.