XFree86 xdm Buffer Overflow Vulnerability

Xdm is the X11 display manager, used for managing X11 user sessions. The XFree86 implementation of xdm (and derivatives such as kdm) contains a possibly exploitable buffer overflow condition.

The overflow is believed to exist when a remote Xserver is attempting to begin an xdm session via XDMCP. Successful exploitation of this vulnerability may provide an attacker with root access on the target host.

Though uncomfirmed, it is most likely required that the attacking host be authorized to connect and listed in the Xaccess file.


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