Vulnerability Details : CVE-2014-5206
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.
Exploit prediction scoring system (EPSS) score for CVE-2014-5206
Probability of exploitation activity in the next 30 days: 0.04%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 6 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2014-5206
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
7.2
|
HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C |
3.9
|
10.0
|
NIST |
CWE ids for CVE-2014-5206
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The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.Assigned by: nvd@nist.gov (Primary)
References for CVE-2014-5206
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http://www.ubuntu.com/usn/USN-2317-1
USN-2317-1: Linux kernel (Trusty HWE) vulnerabilities | Ubuntu security noticesThird Party Advisory
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http://www.securityfocus.com/bid/69214
Linux Kernel CVE-2014-5206 Local Security Bypass VulnerabilityThird Party Advisory;VDB Entry
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http://www.ubuntu.com/usn/USN-2318-1
USN-2318-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
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https://bugzilla.redhat.com/show_bug.cgi?id=1129662
1129662 – (CVE-2014-5206, CVE-2014-5207) CVE-2014-5206 CVE-2014-5207 kernel: mount flags handling during remountIssue Tracking;Patch;Third Party Advisory
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http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a6138db815df5ee542d848318e5dae681590fccd
kernel/git/torvalds/linux.git - Linux kernel source treePatch;Vendor Advisory
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http://www.openwall.com/lists/oss-security/2014/08/13/4
oss-security - Re: CVE Request: ro bind mount bypass using user namespacesMailing List;Third Party Advisory
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https://github.com/torvalds/linux/commit/a6138db815df5ee542d848318e5dae681590fccd
mnt: Only change user settable mount flags in remount · torvalds/linux@a6138db · GitHubPatch;Third Party Advisory
Products affected by CVE-2014-5206
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*