CVE-2014-7975

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

The do_umount function in fs/namespace.c in the Linux kernel through 3.17 does not require the CAP_SYS_ADMIN capability for do_remount_sb calls that change the root filesystem to read-only, which allows local users to cause a denial of service (loss of writability) by making certain unshare system calls, clearing the / MNT_LOCKED flag, and making an MNT_FORCE umount system call.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0ef3a56b1c466629cd0bf482b09c7b0e5a085bb5

http://secunia.com/advisories/60174

http://secunia.com/advisories/61145

http://secunia.com/advisories/62633

http://secunia.com/advisories/62634

http://thread.gmane.org/gmane.linux.kernel.stable/109312

http://www.openwall.com/lists/oss-security/2014/10/08/22

http://www.securityfocus.com/bid/70314

http://www.securitytracker.com/id/1031180

http://www.ubuntu.com/usn/USN-2415-1

http://www.ubuntu.com/usn/USN-2416-1

http://www.ubuntu.com/usn/USN-2417-1

http://www.ubuntu.com/usn/USN-2418-1

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

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

http://www.ubuntu.com/usn/USN-2421-1

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

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

https://bugzilla.redhat.com/show_bug.cgi?id=1151108

https://exchange.xforce.ibmcloud.com/vulnerabilities/96994

Details

Source: MITRE

Published: 2014-10-13

Updated: 2020-08-14

Risk Information

CVSS v2

Base Score: 4.9

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C

Impact Score: 6.9

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3

Base Score: 5.5

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to 3.17 (inclusive)

Configuration 2

OR

cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:-:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*

Tenable Plugins

View all (21 total)

IDNameProductFamilySeverity
124823EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1500)NessusHuawei Local Security Checks
high
124807EulerOS Virtualization 3.0.1.0 : kernel (EulerOS-SA-2019-1483)NessusHuawei Local Security Checks
high
102734CentOS 7 : kernel (CESA-2017:1842) (Stack Clash)NessusCentOS Local Security Checks
high
102645Scientific Linux Security Update : kernel on SL7.x x86_64 (20170801)NessusScientific Linux Local Security Checks
high
102281Oracle Linux 7 : kernel (ELSA-2017-1842)NessusOracle Linux Local Security Checks
high
102151RHEL 7 : kernel-rt (RHSA-2017:2077)NessusRed Hat Local Security Checks
high
102143RHEL 7 : kernel (RHSA-2017:1842) (Stack Clash)NessusRed Hat Local Security Checks
high
99163OracleVM 3.3 : Unbreakable / etc (OVMSA-2017-0057) (Dirty COW)NessusOracleVM Local Security Checks
critical
82691OracleVM 3.3 : kernel-uek (OVMSA-2015-0040)NessusOracleVM Local Security Checks
high
81966Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2015-3012)NessusOracle Linux Local Security Checks
high
80152openSUSE Security Update : the Linux Kernel (openSUSE-SU-2014:1677-1)NessusSuSE Local Security Checks
high
79436Ubuntu 14.10 : linux vulnerabilities (USN-2421-1)NessusUbuntu Local Security Checks
medium
79435Ubuntu 14.04 LTS : linux vulnerabilities (USN-2420-1)NessusUbuntu Local Security Checks
medium
79434Ubuntu 12.04 LTS : linux-lts-trusty vulnerabilities (USN-2419-1)NessusUbuntu Local Security Checks
medium
79433Ubuntu 12.04 LTS : linux vulnerabilities (USN-2417-1)NessusUbuntu Local Security Checks
high
79432Ubuntu 10.04 LTS : linux-ec2 vulnerabilities (USN-2416-1)NessusUbuntu Local Security Checks
medium
79431Ubuntu 10.04 LTS : linux vulnerability (USN-2415-1)NessusUbuntu Local Security Checks
medium
78800Fedora 21 : kernel-3.17.1-300.fc21 (2014-12955)NessusFedora Local Security Checks
medium
78617Mandriva Linux Security Advisory : kernel (MDVSA-2014:201)NessusMandriva Local Security Checks
high
78582Fedora 19 : kernel-3.14.22-100.fc19 (2014-13020)NessusFedora Local Security Checks
medium
78574Fedora 20 : kernel-3.16.6-200.fc20 (2014-13045)NessusFedora Local Security Checks
medium