Reported April 30, 2002, by Internet Security Systems.
RealSecure Network Sensor 6.5
RealSecure Network Sensor 6.0, XPU 3.4 and later
RealSecure Network Sensor 5.x, XPU 3.4 and later
A Denial of Service (DoS) condition exists in Internet Security Systems’ RealSecure Network Sensor. Specifically, a vulnerability in the three informational signatures associated with DHCP can result in a segmentation fault or exception error. An attacker can exploit this vulnerability by sending specially crafted DHCP traffic, causing the sensor to malfunction or crash.
Discovered by Internet Security Systems