Description

The pivot_root implementation in fs/namespace.c in the Linux kernel through 3.17 does not properly interact with certain locations of a chroot directory, which allows local users to cause a denial of service (mount-tree loop) via . (dot) values in both arguments to the pivot_root system call.

References

http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html

http://secunia.com/advisories/60174

http://secunia.com/advisories/61142

http://www.openwall.com/lists/oss-security/2014/10/08/21

http://www.securityfocus.com/bid/70319

http://www.securitytracker.com/id/1030991

http://www.spinics.net/lists/linux-fsdevel/msg79153.html

http://www.ubuntu.com/usn/USN-2419-1

http://www.ubuntu.com/usn/USN-2420-1

http://www.ubuntu.com/usn/USN-2513-1

http://www.ubuntu.com/usn/USN-2514-1

https://access.redhat.com/errata/RHSA-2017:1842

https://access.redhat.com/errata/RHSA-2017:2077

https://bugzilla.redhat.com/show_bug.cgi?id=1151095

https://exchange.xforce.ibmcloud.com/vulnerabilities/96921

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0d0826019e529f21c84687521d03f60cd241ca7d

Details

Risk Information

CVSS v2

CVSS v3