Mozilla XBL binding vulnerability

Overview

Mozilla products fail to properly restrict access to privileged XBL bindings. This vulnerability may allow a remote, unauthenticated attacker to execute arbitrary code.

Description

XBL

According to Mozilla, XBL "is a markup language that defines special new elements, or ‘bindings’ for XUL widgets (and for HTML elements …) ".

The Problem

Privileged XBL bindings may be accessible by user controlled content in a way that could allow a remote attacker to execute arbitrary code. Specifically, the valueOf.call()and valueOf.apply() routines can be leveraged by an attacker to compile and execute arbitrary code with the privileges of the attacked XBL binding.

For a list of affected products refer to Mozilla Foundation Security Advisory 2006-16.

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Impact

A remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system.

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Solution

Upgrade
Refer to Mozilla Foundation Security Advisory 2006-16 for fixed versions of Mozilla products.

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Disable JavaScript

For instructions on how to disable JavaScript in Firefox, please refer to the Firefox section of the Securing Your Web Browser document.

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Vendor Information

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Mozilla, Inc. __ Affected

Updated: April 17, 2006

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Addendum

Refer to <http://www.mozilla.org/security/announce/2006/mfsa2006-16.html&gt;.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23488774 Feedback>).

Red Hat, Inc. __ Affected

Updated: May 17, 2006

Statement Date: May 17, 2006

Status

Affected

Vendor Statement

This issue affected Firefox and Thunderbird as shipped with Red Hat Enterprise Linux 4, and Mozilla as shipped with Red Hat Enterprise Linux 2.1, 3, and 4. Updated packages are available along with our advisories at the URL below and by using the Red Hat Network ‘up2date’ tool.

<https://rhn.redhat.com/cve/CVE-2006-1733.html&gt;

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	0	AV:–/AC:–/Au:–/C:–/I:–/A:–
Temporal	0	E:ND/RL:ND/RC:ND
Environmental	0	CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND

References

• <http://www.mozilla.org/security/announce/2006/mfsa2006-16.html&gt;
• <https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XUL/Tutorial/Introduction_to_XBL&gt;
• <https://bugzilla.mozilla.org/show_bug.cgi?id=312871&gt;
• <https://bugzilla.mozilla.org/show_bug.cgi?id=313236&gt;
• <https://bugzilla.mozilla.org/show_bug.cgi?id=313375&gt;

Acknowledgements

This vulnerability was reported in Mozilla Foundation Security Advisory 2006-16. Mozilla credits moz_bug_r_a4 with providing information regarding this issue.

This document was written by Jeff Gennari.

Other Information

CVE IDs:	CVE-2006-1733
Severity Metric:	26.44 Date Public: