full-disclosure - Re: iDefense Security Advisory 12.22.05: Linux Kernel Socket Buffer Memory Exhaustion DoS Vulnerability

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Message-ID: <43C520AF.7090101@starzetz.de>
Date: Wed Jan 11 15:48:07 2006
From: paul at starzetz.de (Paul Starzetz)
Subject: Re: iDefense Security Advisory 12.22.05: Linux
 Kernel Socket Buffer Memory Exhaustion DoS Vulnerability

labs-no-reply@...fense.com wrote:

>
> The vulnerability specifically exists due to a lack of resource checking
> during the buffering of data for transfer over a pair of sockets. An
> attacker can create a situation that, depending on the amount of
> available system resources, can cause the kernel to panic due to memory
> resource exhaustion. The attack is conducted by opening up a number of

This is and has been ever known stuff in Linux :-]
The problem is even worse, since you can use AF_UNIX sockets to "hide" 
other filled sockets from the file-table descriptor limit (via send_msg).

please check

http://ko.librie.org/bigrip4.c

running it as unprivileged user will kill most of the processes (even 
those of root) on vulnerable machines.

regards

Paul Starzetz