bugtraq - Re: Linux kernel scm

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Message-ID: <41C03386.3040401@gmx.at>
Date: Wed, 15 Dec 2004 13:52:22 +0100
From: even multiplexed <Shadow333@....at>
To: Paul Starzetz <ihaquer@...c.pl>
Cc: security@...c.pl,  bugtraq@...urityfocus.com, 
 vulnwatch@...nwatch.org,  full-disclosure@...ts.netsys.com
Subject: Re: Linux kernel scm_send local DoS


Paul Starzetz wrote:

>On Wed, 15 Dec 2004, even multiplexed wrote:
>
>  
>
>>attention.i just wanted to ask if anyone has a tip for me how to 
>>quickfix this bug, without actually rebuilding a patched version of the 
>>kernel.
>>    
>>
>
>I don't think this is practicable, since the bugs reside in deep kernel 
>functions. You can not fix it just by disabling a particular syscall. You 
>have patch a running kernel binary, maybe someone comes up with this kind 
>of utlility.
>
>  
>
well, i was also examining the igmp exploit you posted earlier, that one 
was relatively easy to disable, by setting the following sysctl vars:

net.ipv4.igmp_max_msf = 0
net.ipv4.igmp_max_memberships = 0
net.ipv4.icmp_ignore_bogus_error_responses = 1

since i dont really need igmp support on that server=)

its just that scm_send thing, that i didnt find any config option for...
so i guess that means either waiting till someone of the kernel 
maintainers release a patch, or get one of my friends, that is better on 
programming tasks, to fix that one...
all at all makes for quite a risky day for a shell provider...