Use-after-free during HTML5 parsing
- December 2, 2014
- Firefox, Firefox ESR, Firefox OS, SeaMonkey, Thunderbird
- Fixed in
- Firefox 34
- Firefox ESR 31.3
- Firefox OS 2.2
- SeaMonkey 2.31
- Thunderbird 31.3
Security researcher SkyLined reported a use-after-free created by triggering the creation of a second root element while parsing HTML written to a document created with
document.open(). This leads to a potentially exploitable crash.
In general this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled, but is potentially a risk in browser or browser-like contexts.