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bisonftp.dos.txt

bisonftp.dos.txt
Posted Feb 19, 2003
Authored by Immune Advisory | Site immune.dk

BisonFTP v4r2 is a FTP daemon used on Microsoft Windows 9x/NT systems which has a remote denial of service vulnerability if sent long FTP commands, and can be tricked into revealing information about files outside the ftp root. It's not possible to get in contact with the people at http://www.bisonftp.com anymore. I guess a new version will never be released.

tags | advisory, remote, web, denial of service, root
systems | windows, 9x
MD5 | 9481f211960b4a41ce46be92d79f07e9

bisonftp.dos.txt

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[immune advisory] Mulitple vulnerabilities found in BisonFTP
================================================================================
BisonFTP is a FTP daemon used on Microsoft Windows 9x/NT systems.


-[ DESCRIPTION ]----------------------------------------------------------------
I) BisonFTP is vulnerable to a DoS attack by sending ftp commands with big
data. By sending the ftp command ls or cwd with 4300 bytes or more,
BisonFTP will start 100% CPU usage until the socket is closed by the client.

II) It's possible to trick BisonFTP into revealing confidiential information
about files outside ftp root.

ftp> ls @../
227 Entering PASV Mode (10,10,10,10,4,126)
150 Directory List Follows
-rwxrwxrwx 1 user group 739577 Feb 05 2002 BisonFTP42.exe
226 Listing complete.
ftp> mget @../Biso
local: BisonFTP42.exe remote: BisonFTP42.exe
227 Entering PASV Mode (10,10,10,10,4,128)
550 File does not exist
ftp>

% Note that BisonFTP42.exe is NOT located in ftp root.


-[ AFFECTED VERSIONS ]----------------------------------------------------------
BisonFTP v4r2.
* Earlier versions are not tested.


-[ SOLUTION/WORKAROUND ]--------------------------------------------------------
It's not possible to get in contact with the people at http://www.bisonftp.com
anymore. I guess a new version will never be released.

Workaround, since there might not be a new version you probaly better to
install another FTP daemon.


-[ CREDIT ]---------------------------------------------------------------------
Bugs found: 15/jan 2003, by Jimmi Andersen
Vendor contacted: 11/feb 2003
Made public: 17/feb 2003
http://www.immune.dk | Immune - Angreb og forsvar af systemer

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