Mozilla JavaScript cloned parent vulnerability

Overview

Mozilla products fail to properly restrict access to a JavaScript functions cloned parent. This vulnerability may allow a remote attacker to execute arbitrary code on a vulnerable system.

Description

According to Mozilla Foundation Security Advisory 2006-15:

it was possible to use the Object.watch() method to access an internal function object (the “clone parent”) which could then be used to run arbitrary JavaScript code with full permission.
_In pre-release versions of Firefox 1.5 the same technique could be applied to the Array generic methods introduced in that release. _
Note that JavaScript must be enabled in order for this vulnerability to exist. JavaScript is enabled by default in the Firefox and Mozilla web browsers, but not in the Mozilla’s mail client or Thunderbird. Exploitation can occur by accessing a specially crafted web page with Firefox. If JavaScript is enabled within Mozilla’s mail client or Thunderbird, then this issue may be exploitable by opening a specially crafted email.

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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 2006-15 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

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to <http://www.mozilla.org/security/announce/2006/mfsa2006-15.html&gt;.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23842094 Feedback>).

Red Hat, Inc. __ Affected

Updated: 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-2006-1734.html&gt;

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
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References

• <http://www.mozilla.org/security/announce/2006/mfsa2006-15.html&gt;
• <https://bugzilla.mozilla.org/show_bug.cgi?id=313370&gt;
• <https://bugzilla.mozilla.org/show_bug.cgi?id=313684&gt;

Acknowledgements

This vulnerability was reported in Mozilla Foundation Security Advisory 2006-15. Mozilla credits shutdown with providing information regarding this issue.

This document was written by Jeff Gennari.

Other Information

CVE IDs:	CVE-2006-1734
Severity Metric:	20.45 Date Public: