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oss-security: Re: [oss-security] CVE Request -- vsftpd -- Do not

Re: [oss-security] CVE Request -- vsftpd -- Do not create network namespace per connection

From: Josh Bressers <bressers_at_nospam>
Date: Mon Jun 06 2011 - 18:28:54 GMT
To: oss-security@lists.openwall.com

----- Original Message -----
> Hello, Josh, Steve, vendors,
>
> It was found that vsftpd, Very Secure FTP daemon, when the network
> namespace (CONFIG_NET_NS) support was activated in the kernel, used to
> create a new network namespace per connection. A remote attacker could
> use this flaw to cause a memory pressure and denial of the vsftpd
> service.
>
> References:
> [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=629373
> [2] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/720095
> [3] https://bugzilla.redhat.com/show_bug.cgi?id=711134
>
> This one being a bit tricky one -- from my understanding of the issue,
> vsftpd doesn't necessarily have a security flaw on its side. It's
> kernel issue / bug, which allows this to be used for vsftpd DoS:
> [4]
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/720095/comments/31
> [5]
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/720095/comments/32
>
> Short-term solution would be probably to address this on the vsftpd
> side, the long-term one then being to get this fixed in kernel.
>
> Though not sure, how it would be wrt to CVE identifier(s) assignment.
>

I'm going to assign CVE-2011-2189 for the kernel. There are numerous
vendors shipping this bug.

I'll leave it up to MITRE if they think vsftpd should get an ID. I don't
think it should myself, but they understand these corner cases better than
I.

Thanks.

-- JB