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Mozilla Firefox "locations.hostname" DOM Property Handling Vulnerability
Secunia Advisory: SA24175
Release Date: 2007-02-16
Last Update: 2007-02-24
Popularity: 17,968 views

Critical:
Moderately critical
Impact: Security Bypass
Manipulation of data
Where: From remote
Solution Status: Vendor Patch

Software:Mozilla Firefox 1.x
Mozilla Firefox 2.0.x
Mozilla SeaMonkey 1.0.x

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CVE reference:CVE-2007-0981


Description:
Michal Zalewski has reported a vulnerability in Mozilla Firefox, which can be exploited by malicious people to bypass certain security restrictions.

The vulnerability is caused due to an error in the handling of the "locations.hostname" DOM property. This can be exploited to e.g. manipulate authentication cookies for an arbitrary web site via assigning a URL including a NULL character ("\x00") to "locations.hostname".

Successful exploitation requires that the user is e.g. tricked into visiting a malicious web site.

The vulnerability is reported in version 2.0.0.1. Other versions may also be affected.

NOTE: Other issues have also been reported, some of which are also related to the "locations.hostname" DOM property.

Solution:
Update to a fixed version.

Firefox:
Update to version 2.0.0.2 or 1.5.0.10.

SeaMonkey:
Update to version 1.0.8.

Provided and/or discovered by:
Michal Zalewski

Changelog:
2007-02-16: Added CVE reference.
2007-02-24: Updated "Solution" section.

Original Advisory:
Full-Disclosure:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-February/052447.html

Other References:
https://bugzilla.mozilla.org/show_bug.cgi?id=370445

US-CERT VU#885753:
http://www.kb.cert.org/vuls/id/885753


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