Vulnerability Details : CVE-2014-9717
fs/namespace.c in the Linux kernel before 4.0.2 processes MNT_DETACH umount2 system calls without verifying that the MNT_LOCKED flag is unset, which allows local users to bypass intended access restrictions and navigate to filesystem locations beneath a mount by calling umount2 within a user namespace.
Vulnerability category: BypassGain privilege
Products affected by CVE-2014-9717
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2014-9717
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2014-9717
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
3.6
|
LOW | AV:L/AC:L/Au:N/C:P/I:P/A:N |
3.9
|
4.9
|
NIST | |
|
6.1
|
MEDIUM | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N |
1.8
|
4.2
|
NIST |
CWE ids for CVE-2014-9717
-
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.Assigned by: nvd@nist.gov (Primary)
References for CVE-2014-9717
-
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00056.html
[security-announce] SUSE-SU-2016:1696-1: important: Security update for
-
http://www.spinics.net/lists/linux-containers/msg30786.html
Linux Containers: [PATCH review 0/19] Locked mount and loopback mount fixes
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http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ce07d891a0891d3c0d0c2d73d577490486b809e1
kernel/git/torvalds/linux.git - Linux kernel source treeVendor Advisory
-
http://www.openwall.com/lists/oss-security/2015/04/17/4
oss-security - USERNS allows circumventing MNT_LOCKED
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http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00054.html
[security-announce] SUSE-SU-2016:1690-1: important: Security update for
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http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html
[security-announce] SUSE-SU-2016:1937-1: important: Security update for
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https://groups.google.com/forum/message/raw?msg=linux.kernel/HnegnbXk0Vs/RClojwJzAFEJ
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https://github.com/torvalds/linux/commit/ce07d891a0891d3c0d0c2d73d577490486b809e1
mnt: Honor MNT_LOCKED when detaching mounts · torvalds/linux@ce07d89 · GitHubVendor Advisory
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http://www.securityfocus.com/bid/74226
Linux Kernel CVE-2014-9717 Local Privilege Escalation Vulnerability
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https://bugzilla.redhat.com/show_bug.cgi?id=1226751
1226751 – (CVE-2014-9717) CVE-2014-9717 kernel: unsharing MNT_LOCKED mount can expose files beneath the mount.
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http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2
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