Date: Mon, 06 Jun 2011 18:19:45 +0200 From: Jan Lieskovsky <jlieskov@...hat.com> To: "Steven M. Christey" <coley@...us.mitre.org> CC: oss-security <oss-security@...ts.openwall.com>, Chris Evans <scarybeasts@...il.com>, Greg KH <greg@...ah.com>, Kees Cook <kees@...ntu.com> Subject: CVE Request -- vsftpd -- Do not create network namespace per connection 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. Steve, could you advice here? Thank you & Regards, Jan. -- Jan iankko Lieskovsky / Red Hat Security Response Team
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