CVE-2014-5206
HIGH severity · CVSS 7.2 · Improper privilege management
7.2CVSS HIGH
Summary
The do_remount function in fs/namespace.c in the Linux kernel through 3.16.1 does not maintain the MNT_LOCK_READONLY bit across a remount of a bind mount, which allows local users to bypass an intended read-only restriction and defeat certain sandbox protection mechanisms via a "mount -o remount" command within a user namespace.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges required—
User interaction—
Confidentiality impact—
Integrity impact—
Availability impact—
Exploit probability (EPSS)0%
AV:L/AC:L/Au:N/C:C/I:C/A:C
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://bugzilla.redhat.com/show_bug.cgi?id=1129662 ↗
Additional information
- NVD record
- https://bugzilla.redhat.com/show_bug.cgi?id=1129662Patch
- https://github.com/torvalds/linux/commit/a6138db815df5ee542d848318e5dae681590fccdPatch
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a6138db815df5ee542d848318e5dae681590fccd
- http://www.openwall.com/lists/oss-security/2014/08/13/4Advisory
- http://www.securityfocus.com/bid/69214Advisory
- http://www.ubuntu.com/usn/USN-2317-1Advisory
- http://www.ubuntu.com/usn/USN-2318-1Advisory