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Category:   Application (Web Browser)  >   Mozilla Firefox Vendors:   Mozilla.org
Mozilla Firefox Buffer Overflow in Processing Hostnames May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1014877
SecurityTracker URL:  http://securitytracker.com/id/1014877
CVE Reference:   CVE-2005-2871   (Links to External Site)
Updated:  Jun 8 2008
Original Entry Date:  Sep 9 2005
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.5 Beta 1, 1.0.6, and prior versions
Description:   A vulnerability was reported in Mozilla Firefox. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create HTML that contains a link to a hostname composed of dash ('-') characters. When the HTML is loaded, a buffer overflow may be triggered and arbitrary code may be executed on the target user's system.

The flaw resides in the IDN support implementation.

A demonstration exploit tag is provided:

<A HREF=https:--------------------------------------------- >

A demonstration exploit is available at:

www.security-protocols.com/firefox-death.html

The vendor was notified on September 4, 2005.

Netscape 7.2 and 8.0.3.3 are also affected.

Tom Ferris of security-protocols.com discovered this vulnerability.

Impact:   A remote user may be able to cause arbitrary code to be executed on the target user's system.
Solution:   The vendor has issued a fixed version (1.0.7), available at:

http://www.mozilla.org/products/firefox/

The vendor previously issued a patch to disable the vulnerable IDN support code within the browser. The patch is available at:

http://www.mozilla.org/security/idn.html

As an alternative to the patch, the vendor has described a manual method to disable IDN support.

Red Hat has issued a fix for Red Hat Enterprise Linux 4:

https://rhn.redhat.com/errata/RHSA-2005-768.html

Red Hat has issued a fix the Mozilla Browser for Red Hat Enterprise Linux 2, 3, and 4:

https://rhn.redhat.com/errata/RHSA-2005-769.html

Vendor URL:  www.mozilla.org/security/idn.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 10 2005 (Red Hat Issues Fix) Mozilla Firefox Buffer Overflow in Processing Hostnames May Let Remote Users Execute Arbitrary Code
Red Hat has released a fix for Red Hat Enterprise Linux 4.
Sep 10 2005 (Red Hat Issues Fix for Mozilla) Mozilla Firefox Buffer Overflow in Processing Hostnames May Let Remote Users Execute Arbitrary Code
Red Hat has released a fix for the Mozilla Browser on Red Hat Enterprise Linux.



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