Bug 188827

Summary: CVE-2006-1733 Accessing XBL compilation scope via valueOf.call()
Product: [Fedora] Fedora Reporter: Josh Bressers <bressers>
Component: firefoxAssignee: Christopher Aillon <caillon>
Status: CLOSED ERRATA QA Contact:
Severity: urgent Docs Contact:
Priority: medium    
Version: 5CC: djuran, security-response-team, wtogami
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: reported=20060412,source=mozilla,embargo=20060414,impact=critical
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2006-04-27 12:55:59 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Josh Bressers 2006-04-13 03:26:47 UTC 
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
Comment 1 Josh Bressers 2006-04-27 12:55:59 UTC 
These issues have been resolved in FEDORA-2006-411 for FC5 and FEDORA-2006-410
for FC4