A buffer overflow exists on the VirusWall smtp gateway - by sending a long HELO command you can overflow the buffer and execute arbitrary code. Example code has been written which will spawn a command prompt on a port you specify. Before you shrug this one off, take a look: Connected to mail1.microsoft.com. Escape character is '^]'. 220 mail1.microsoft.com InterScan VirusWall NT ESMTP 3.23 (build 9/10/99) ready at Sun, 07 Nov 1999 03:38:44 -0800 (Pacific Standard Time) The ironic thing here is, VirusWall was designed to prevent viruses and 'malicious code'. Obviously not a lot of thought was taken before laying their trust into 3rd party 'security' products. A quick note to the millions out there who would give their right arm to compromise microsofts network - sorry, their firewall would prevent the payload from spawning a remote shell.. unless of course it was modified to stop an existing service to open a port :) Exploit source and binary is available at http://www.beavuh.org. Credit to Liraz Siri for bringing this to our attention. Hi to eEye/w00w00/teso. dark spyrit http://www.beavuh.org - bend over and pray.
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