Accessing XBL compilation scope via valueOf.call() moz_bug_r_a4 discovered that the compilation scope of privileged built-in XBL bindings was not fully protected from web content and could be accessed by calling valueOf.call() and valueOf.apply() on a method of that binding. This could then be used to compile and run attacker-supplied JavaScript, giving it the privileges of the binding which would allow an attacker to install malware such as viruses and password sniffers. shutdown reported an alternate way to get to XBL compilation scope by inserting an XBL method into the DOM's document.body prototype chain. Note: Thunderbird shares the JavaScript engine with Firefox and could be vulnerable if JavaScript were to be enabled in mail. This is not the default setting and we strongly discourage users from running JavaScript in mail. Workaround Disable JavaScript until you can upgrade to a fixed version. References [1]https://bugzilla.mozilla.org/show_bug.cgi?id=312871 [2]https://bugzilla.mozilla.org/show_bug.cgi?id=313236 [3]https://bugzilla.mozilla.org/show_bug.cgi?id=313375 This issue also affects FC4
Lifting embargo
Fedora Core 5 is no longer supported, could you please reproduce this with the updated version of the currently supported distribution (Fedora Core 6, or Fedora 7, or Rawhide)? If this issue turns out to still be reproducible, please let us know in this bug report. If after a month's time we have not heard back from you, we will have to close this bug as CANTFIX. Setting status to NEEDINFO, and awaiting information from the reporter. Thanks in advance.
We haven't got any reply to the last question about reproducability of the bug with Fedora Core 6, Fedora 7, or Fedora devel. Mass closing this bug, so if you have new information that would help us fix this bug, please reopen it with the additional information.