vl4dZ

Biography: 

vl4dZ is a system administrator who is into security and coding (Bash & C). He has written tools like Assh: The Anonymous Secure SHell, Fsnoop, GUChaos, Pwd-hash, and other useful sec tools.

Facts

Coded a simple Man-in-middle detection script.

He discovered two vulnerabilities in the X server Xorg and assigned with CVE-2011-4028 and CVE-2011-4029.

More of his disclosures and papers can be found here: http://vladz.devzero.fr/

References