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Linux kernel flaw found

Can lead to denial of service
Mon Oct 25 2004, 08:05
USERS OF Linux running a 2.6 series kernel and using iptables for firewalling have been advised to upgrade to fix a bug which could be exploited remotely to cause a denial of service.

The bug, discovered by Richard Hart, does not affect the 2.4 series kernel or the later version. It is caused by an integer underflow problem in the iptables firewall logging rules. This means that a hacker could remotely crash the machine by using a specially designed IP packet.

Ironically, they can only do this if a firewall is enabled in the kernel.

A spokesSuSE said a workaround was to disable firewall logging of IP and TCP options. It is better practice to upgrade your kernel to the latest version. µ

 

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