Re[2]: Microsoft FTP Client Multiple Bufferoverflow Vulnerability

[3APA3A <3APA3A () SECURITY NNOV RU>]

Dear Valdis.Kletnieks () vt edu,



--Friday, November 30, 2007, 1:19:49 AM, you wrote to 3APA3A () SECURITY NNOV RU:


> > An attacker who can convince an user to extract a specially crafted
> > archive can overwrite arbitrary files with the permissions of the user
> > running gtar.  If that user is root, the attacker can overwrite any
> > file on the system.

VKve> Apparently, somebody at FreeBSD thinks "can be exploited if you trick the
VKve> user into doing something" is a valid attack vector.

This  is  valid  factor.  The  difference  is,  if you can force user to
extract  archive, you need vulnerability in gtar in order to exploit. If
you  can  force user to run executable script, you need no vulnerability
in FTP client to exploit this.


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