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Home » Hacking News » LAND attack

LAND attack

by Nikola Strahija on May 25th, 2005 On Tuesday the French Security Incident Response Team (FrSIRT) issued an alert about a security bug in Microsoft's implementation of TCP/IP in Windows XP and 2003.


The flaw in the Windows IPv6 TCP/IP stack means systems are liable to crash when processing maliciously crafted packets in which the SYN flag is set, and the source address and port are the same as the destination address and port (a so-called Land Attack). FrSIRT said that even systems running the latest, fully patched versions of XP SP2 or Win 2003 SP1 could be crashed using an attack based on the vulnerability.

Microsoft disputes this point, arguing that customer running XP SP2 or Win 2003 SP1 or those who'd applied a patch release in April are protected. No customers have reported attacks based on the reported vulnerability, it says. According to FrSIRT, Microsoft's April fix only addresses a variant of the latest vulnerability, an IPv4 Land attack risk, not the IPv6 attack that formed the subject of its Tuesday alert. It advises corporates to filter potentially malicious traffic at the firewall pending a more comprehensive fix.


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