Vulnerabilities in BO2k encryption plugins

[beng () SECURITYFOCUS COM (Ben Greenbaum)]

Discovered by Irwan Amir Widjaja <irwanw () netscape net> and Daniel
Roethlisberger <admin () roe ch>.

Two popular encryption plugins for Back Orifice 2000 have been found to
have serious security flaws: BO_CAST and BO2K IDEA. Both have been fixed.
The flaw is that due to a small error in one line of the MD5 hash
algorithm code, any password generated the same hash.

The fixed versions are available at:
IDEA:      http://www.wynne.demon.co.uk/maw/IDEAEncrypt.zip
BO_CAST:   http://www.roe.ch/cgi-bin/bo_cast.pl

More information is available at:
http://www.securityfocus.com/level2/?go=vulnerabilities&id=561
http://www.securityfocus.com/level2/?go=vulnerabilities&id=562

Ben Greenbaum
SecurityFocus
www.securityfocus.com