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October 3, 2008 / technocrawl

Flaw in TCP Stack leads to Massive DoS Attack

Multiple flaws have been found in TCP stack, and when exploited, this will lead to massive DoS attack.

Two Researchers in Sweden found this and there is no patch for this yet. The discovery follows a test using a port scanner called ‘Unicornscan’, which Lee and senior security researcher Jack Louis created.

“Jack found some anomalies in which machines would stop working in some very specific circumstances while being scanned,” Lee told CNET One of the behaviours experienced was packet loss, where the packets repeatedly kept trying, creating, more or less, a denial of service (DoS) on that machine.

To exploit the flaws, to see if the TCP vulnerabilities were real, Lee and Louis created a program called ‘Sockstress’ that intentionally did some wrong things with the TCP/IP handshake process. The Sockstress program was very effective in producing DoS attacks. The pair have no plans to release Sockstress.

If this was the case, then this flaw would be a wet dream for Hackers to craft an exploit code to launch DoS attacks on millions of sites.

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