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CVE-2016-1631

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Universal XSS using Flash message loop

Reported by mailto:marius.mlynski@gmail.com, Dec 14 2015

VULNERABILITY DETAILS

From /content/renderer/pepper/ppb_flash_message_loop_impl.cc:

int32_t PPB_Flash_MessageLoop_Impl::InternalRun(
    const RunFromHostProxyCallback& callback) {
(...)
  // It is possible that the PPB_Flash_MessageLoop_Impl object has been
  // destroyed when the nested message loop exits.
  scoped_refptr<State> state_protector(state_);
  {
    base::MessageLoop::ScopedNestableTaskAllower allow(
        base::MessageLoop::current());
    base::MessageLoop::current()->Run();
  }
(...)
}

PPB_Flash_MessageLoop_Impl::InternalRun doesn't initialize a ScopedPageLoadDeferrer before spinning an event loop. As a result, cross-origin documents can be loaded at an arbitrary javascript execution point.

VERSION

Chrome 47.0.2526.80 (Stable) Chrome 48.0.2564.41 (Beta) Chrome 49.0.2587.3 (Dev) Chromium 49.0.2591.0 + Pepper Flash (Release build compiled today)

Link: https://bugs.chromium.org/p/chromium/issues/detail?id=569496