Date: Mon, 6 Jun 2011 14:28:54 -0400 (EDT) From: Josh Bressers <bressers@...hat.com> To: oss-security@...ts.openwall.com Cc: Chris Evans <scarybeasts@...il.com>, Greg KH <greg@...ah.com>, Kees Cook <kees@...ntu.com>, "Steven M. Christey" <coley@...us.mitre.org> Subject: Re: CVE Request -- vsftpd -- Do not create network namespace per connection ----- 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: >  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=629373 >  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/720095 >  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: >  > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/720095/comments/31 >  > 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
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