Description
fs/proc/root.c in the procfs implementation in the Linux kernel before 3.2 does not properly interact with CLONE_NEWPID clone system calls, which allows remote attackers to cause a denial of service (reference leak and memory consumption) by making many connections to a daemon that uses PID namespaces to isolate clients, as demonstrated by vsftpd.
References
- https://github.com/torvalds/linux/commit/905ad269c55fc62bee3da29f7b1d1efeba8aa1e1
- USN-1594-1 vendor-advisory
- [oss-security] 20120422 Re: Re: CVE request: pid namespace leak in kernel 3.0 and 3.1 mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=815188
- USN-1607-1 vendor-advisory
- http://www.kernel.org/pub/linux/kernel/v3.x/
- 55774 vdb-entry
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=905ad269c55fc62bee3da29f7b1d1efeba8aa1e1
- https://bugzilla.novell.com/show_bug.cgi?id=757783
- [oss-security] 20120420 Re: CVE request: pid namespace leak in kernel 3.0 and 3.1 mailing-list
- http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.2.bz2