Date: Fri, 29 Jul 2011 16:37:28 +0800 From: Eugene Teo <eugene@...hat.com> To: oss-security@...ts.openwall.com CC: Josh Bressers <bressers@...hat.com>, 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 On 06/07/2011 02:28 AM, Josh Bressers wrote: > > ----- 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. Kees, how are you guys fixing this? Disable net_ns and fix vsftpd? I wonder how other distros approach this. Any suggestions? Thanks, Eugene
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