Title: ISS RealSecure DHCP Signature Remote Denial Of Service Vulnerability
Severity: MODERATE
Description:
RealSecure is the commercial Intrusion Detection System (IDS) distributed and maintained by ISS.
A problem with the software could make it possible for a remote user to crash the IDS.
RealSecure becomes unstable when processing some of the DHCP signatures packaged with the system. Due to the construction of the three DHCP signatures (DHCP_ACK - 7131, DHCP_Discover - 7132, and DHCP_Request - 7133), the RealSecure software may become unstable and crash. This is due to the software attempting to dereference a null pointer.
This problem makes it possible for a remote attacker to crash a vulnerable RealSecure sensor. By sending malicious DHCP traffic to the server, it is possible to force the sensor to load one of the malicious signatures, resulting in this vulnerability.
This vulnerability affects versions 5.x XPU 3.4 and later, 6.0 XPU 3.4 and later, and 6.5 of the software.
If the sensor is disabled, further attacks may go unnoticed.
Affected Products:
- Internet Security Systems RealSecure Network Sensor 5.0.0 XPU 3.4
- Internet Security Systems RealSecure Network Sensor 5.5.0 XPU 3.4
- Internet Security Systems RealSecure Network Sensor 5.5.1 XPU 3.4
- Internet Security Systems RealSecure Network Sensor 5.5.2 XPU 3.4
- Internet Security Systems RealSecure Network Sensor 6.0.0 XPU 3.4
- Internet Security Systems RealSecure Network Sensor 6.5.0
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