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

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Date: Wed, 11 Jan 2006 16:13:51 +0100
From: Paul Starzetz <paul@...rzetz.de>
To: "labs@...fense.com" <labs@...fense.com>
Cc: full-disclosure@...ts.grok.org.uk, vulnwatch@...nwatch.org,
	bugtraq@...urityfocus.com
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

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