Vulnerability CVE-2014-5206
Published: 2014-08-18

Description:
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.

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Linux -> Linux kernel 

 References:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a6138db815df5ee542d848318e5dae681590fccd
http://www.openwall.com/lists/oss-security/2014/08/13/4
http://www.securityfocus.com/bid/69214
http://www.ubuntu.com/usn/USN-2317-1
http://www.ubuntu.com/usn/USN-2318-1
https://bugzilla.redhat.com/show_bug.cgi?id=1129662
https://github.com/torvalds/linux/commit/a6138db815df5ee542d848318e5dae681590fccd
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