full-disclosure - Re: Linux kernel IGMP vulnerabilities

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

From: ihaquer at isec.pl (Paul Starzetz)
Subject: Re: Linux kernel IGMP vulnerabilities

On Tue, 14 Dec 2004, stephen joseph butler wrote:

> > /proc/net/igmp
> > /proc/net/mcfilter
> > 
> > if both exist and are non-empty you are vulnerable!
> 
> Just to be clear: if "mcfilter" is empty, then you aren't vulnerable?
> I have both files, and "igmp" contains data, but "mcfilter" is empty.

You are not vulnerable to the remote attack described under (3), however 
your kernel may be still buggy. Note that you need a running process that 
has manipulated its multicast socket filters. If your kernel is buggy and 
you have local users such an application can always appear, at a time you 
don't expect it.

-- 
Paul Starzetz
iSEC Security Research
http://isec.pl/