Advisory name

=============



Netscape 7.02 Client Detection Tool plug-in buffer overrun



Affected software

=================



Netscape 7.02 for Windows



Problem description

===================



Netscape 7.02 (and probably earlier versions) contains Client Detection 

Tool plug-in that handles application/x-cdt Mime type. One of this plug-in 

routines suffers from buffer overrun. To exploit this issue one needs to 

send mail message to victim with attachment that has specifically crafted 

filename and entice the victim to double-click it. When the victim double

clicks the attachment then attacker's code is executed in context of 

victim's user account. Proof-of-concept exploit is published in whitepaper 

"CDT plug-in bug: exploit in ASCII": 



http://jimmers.russia.webmatrixhosting.net/whitepapers/CDTbug.pdf



Mitigating factors

==================



Attacker must know OS and length of victim username to exploit this issue.

Also proof-of-concept exploit assumes that user runs Windows with default

settings.



Resolution

==========



Manually remove CDT plug-in (npcdt.dll) from Netscape /components folder 

or upgrade to latest version of the browser that has CDT plug-in removed.



Vendor status

=============



Netscape was notified. Netscape considers this bug as "internal" so no 

patch will be released.





Copyright (c) 2003 Martin Rakhmanov.