CVE-2013-1956 Information

Description

The create_user_ns function in kernel/user_namespace.c in the Linux kernel before 3.8.6 does not check whether a chroot directory exists that differs from the namespace root directory which allows local users to bypass intended filesystem restrictions via a crafted clone system call.

Reference

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3151527ee007b73a0ebd296010f1c0454a919c7d http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.6 http://www.openwall.com/lists/oss-security/2013/04/16/11 https://github.com/torvalds/linux/commit/3151527ee007b73a0ebd296010f1c0454a919c7d