OSEC

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WzdFTPD < 8.1 Denial of service

From: S21sec Labs (labss21sec.com)
Date: Fri Jan 19 2007 - 05:54:07 CST


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                      - S21Sec Advisory -

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     Title: WzdFTPD Denial of Service
        ID: S21SEC-033-en
  Severity: Medium - Denial of Service
   History: 26.Dic.2006 Vulnerability discovered
                      8.Ene.2007 Vendor contacted

     Scope: FTP Server Denial of Service
Platforms: Any
    Author: Jose Miguel Esparza (jesparzas21sec.com)
       URL: http://www.s21sec.com/avisos/s21sec-033-en.txt
   Release: Public

[ SUMMARY ]

WzdFTPD is a ftp server designed to be modular and portable, work
under linux/win32/freebsd/openbsd, and to be entirely configurable
online using SITE commands. It supports SSL, IPv6, multithreading,
external scripts, and it uses Unix-like permissions and ACLs, with
virtual users and groups.

WzdFTPD project also supports bandwith limitation (per user, per
group, or globally), group administrators, and per command
authorization.

[ AFFECTED VERSIONS ]

Following versions are affected with this issue:

        - WzdFTPD v8.0 and prior.
         - Lastest version (8.1) is not affected by this vulnerability.

[ DESCRIPTION ]

It's possible to cause a denial of service sending a special crafted
FTP command.

[ WORKAROUND ]

Add "key != NULL" condition in the chtbl_lookup function of the
hash.c file until vendor solution or upgrade to 8.1.

[ ACKNOWLEDGMENTS ]

These vulnerabilities have been found and researched by:

        - Jose Miguel Esparza <jesparzas21sec.com> S21Sec

With thanks to:

        - David Barroso <dbarrosos21sec.com> S21Sec

[ REFERENCES ]

* WzdFTPD
   http://www.wzdftpd.net/

* S21Sec
   http://www.s21sec.com