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 http://www.wu-ftpd.org
Threat Level: High
Click HERE for more information and discussions on this network vulnerability scan.