Date: Mon, 20 Dec 1999 12:53:13 +1100
From: suid <suid@SUID.EDU>
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: Security vulnerability in certain wu-ftpd (and derivitives) configurations (fwd)
The following paper is available in full from my website, i have chosen
not to post the entire thing here as it is quite long.
http://www.suid.edu/advisories/001.txt
suid@suid.edu - the dangers of ftp conversions on misconfigured systems/ftpd (specifically wu-ftpd)
Summary:
There exists a vulnerability with certain configurations of certain ftp daemons with which users with a valid
ftp only acccount on a system may execute arbitrary commands (including binaries supplied by themselves). There
also exists the possibilty that anonymous ftp users may execute arbitrary commands (also including binaries
supplied by themselves).
While this vulnerability is entirely configuration dependent. The required configuration is rather common. The
requirements can be found in the example exploit section. Usually such misconfigurations are made only by the
security-handicapped, and the documentation-illiterate. There is volumous amounts of documentation around which
warn against this kind of configuration however it does not touch
on this exact problem. Nor does that seem to prevent people from doing
this time after time.
Regards,
suid@suid.edu
