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Family: FTP --> Category: infos

wu-ftpd S/KEY authentication overflow Vulnerability Scan

Vulnerability Scan Summary
Checks the banner of the remote wu-ftpd server

Detailed Explanation for this Vulnerability Test

The remote Wu-FTPd server seems to be vulnerable to a remote overflow.

This version contains a remote overflow if s/key support is enabled.
The skey_challenge function fails to perform bounds checking on the
name variable resulting in a buffer overflow.
With a specially crafted request, a possible hacker can execute arbitrary
code resulting in a loss of integrity and/or availability.

It appears that this vulnerability may be exploited prior to authentication.
It is reported that S/Key support is not enabled by default,
though some operating system distributions which ship Wu-Ftpd may have it

*** Nessus solely relied on the banner of the remote server
*** to issue this warning, so it may be a false positive.

Solution : Upgrade to Wu-FTPd 2.6.3 when available or disable SKEY or apply the
patches available at

Threat Level: High

Click HERE for more information and discussions on this network vulnerability scan.


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