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Vulnerabilities in TCP

By Thomas McGuire

On April 21, 2004, 12:07 PM

Most implementations of the Border Gateway Protocol (BGP) rely on the Transmission Control Protocol (TCP) to maintain persistent unauthenticated network sessions. There is a vulnerability in TCP which allows remote attackers to terminate network sessions. Sustained exploitation of this vulnerability could lead to a denial of service condition; in the case of BGP systems, portions of the Internet community may be affected. Routing operations would recover quickly after such attacks ended.

Impact: Sustained exploitation of the TCP injection vulnerability with regard to the BGP vulnerability could lead to a denial-of-service condition that could affect a large segment of the Internet community. Normal operations would most likely resume shortly after the attack stopped.

Since the TCP/IP Initial Sequence Number vulnerability (VU#498440) has been proven more viable of an attack, any services or sites that rely on persistent TCP sessions could also be affected by this vulnerability. Impacts could range from data corruption or session hijacking to a denial-of-service condition.

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