CVE-2013-4270: Input Validation
Published Nov 7, 2013
·Updated
A flaw was found in the way netctlpermissions() function in the Linux kernel checked permissions.
As a result, an unprivileged local user could potentially use this flaw to access files in /proc/sys/net in a way that he would otherwise be unable to.
Introduced by:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cff109768b2d9c03095848f4cd4b0754117262aa
Fixed by:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2433c8f094a008895e66f25bd1773cdb01c91d01
Acknowledgements:
This issue was discovered by Miroslav Vadkerti of Red Hat.
Other sources
The netctlpermissions function in net/sysctlnet.c in the Linux kernel before 3.11.5 does not properly determine uid and gid values, which allows local users to bypass intended /proc/sys/net restrictions via a crafted application.
— Launchpad
Affected Software
270 affected componentsFixes available
Linux Linux kernel<=3.11.4
Linux Linux kernel=3.0-rc1
Linux Linux kernel=3.0-rc2
Linux Linux kernel=3.0-rc3
Linux Linux kernel=3.0-rc4
Linux Linux kernel=3.0-rc5
Linux Linux kernel=3.0-rc6
Linux Linux kernel=3.0-rc7
Linux Linux kernel=3.0.1
Linux Linux kernel=3.0.2
Linux Linux kernel=3.0.3
Linux Linux kernel=3.0.4
Linux Linux kernel=3.0.5
Linux Linux kernel=3.0.6
Linux Linux kernel=3.0.7
Linux Linux kernel=3.0.8
Linux Linux kernel=3.0.9
Linux Linux kernel=3.0.10
Linux Linux kernel=3.0.11
Linux Linux kernel=3.0.12
Linux Linux kernel=3.0.13
Linux Linux kernel=3.0.14
Linux Linux kernel=3.0.15
Linux Linux kernel=3.0.16
Linux Linux kernel=3.0.17
Linux Linux kernel=3.0.18
Linux Linux kernel=3.0.19
Linux Linux kernel=3.0.20
Linux Linux kernel=3.0.21
Linux Linux kernel=3.0.22
Linux Linux kernel=3.0.23
Linux Linux kernel=3.0.24
Linux Linux kernel=3.0.25
Linux Linux kernel=3.0.26
Linux Linux kernel=3.0.27
Linux Linux kernel=3.0.28
Linux Linux kernel=3.0.29
Linux Linux kernel=3.0.30
Linux Linux kernel=3.0.31
Linux Linux kernel=3.0.32
Linux Linux kernel=3.0.33
Linux Linux kernel=3.0.34
Linux Linux kernel=3.0.35
Linux Linux kernel=3.0.36
Linux Linux kernel=3.0.37
Linux Linux kernel=3.0.38
Linux Linux kernel=3.0.39
Linux Linux kernel=3.0.40
Linux Linux kernel=3.0.41
Linux Linux kernel=3.0.42
Linux Linux kernel=3.0.43
Linux Linux kernel=3.0.44
Linux Linux kernel=3.0.45
Linux Linux kernel=3.0.46
Linux Linux kernel=3.0.47
Linux Linux kernel=3.0.48
Linux Linux kernel=3.0.49
Linux Linux kernel=3.0.50
Linux Linux kernel=3.0.51
Linux Linux kernel=3.0.52
Linux Linux kernel=3.0.53
Linux Linux kernel=3.0.54
Linux Linux kernel=3.0.55
Linux Linux kernel=3.0.56
Linux Linux kernel=3.0.57
Linux Linux kernel=3.0.58
Linux Linux kernel=3.0.59
Linux Linux kernel=3.0.60
Linux Linux kernel=3.0.61
Linux Linux kernel=3.0.62
Linux Linux kernel=3.0.63
Linux Linux kernel=3.0.64
Linux Linux kernel=3.0.65
Linux Linux kernel=3.0.66
Linux Linux kernel=3.0.67
Linux Linux kernel=3.0.68
Linux Linux kernel=3.1
Linux Linux kernel=3.1-rc1
Linux Linux kernel=3.1-rc2
Linux Linux kernel=3.1-rc3
Linux Linux kernel=3.1-rc4
Linux Linux kernel=3.1.1
Linux Linux kernel=3.1.2
Linux Linux kernel=3.1.3
Linux Linux kernel=3.1.4
Linux Linux kernel=3.1.5
Linux Linux kernel=3.1.6
Linux Linux kernel=3.1.7
Linux Linux kernel=3.1.8
Linux Linux kernel=3.1.9
Linux Linux kernel=3.1.10
Linux Linux kernel=3.2
Linux Linux kernel=3.2-rc2
Linux Linux kernel=3.2-rc3
Linux Linux kernel=3.2-rc4
Linux Linux kernel=3.2-rc5
Linux Linux kernel=3.2-rc6
Linux Linux kernel=3.2-rc7
Linux Linux kernel=3.2.1
Linux Linux kernel=3.2.2
Linux Linux kernel=3.2.3
Linux Linux kernel=3.2.4
Linux Linux kernel=3.2.5
Linux Linux kernel=3.2.6
Linux Linux kernel=3.2.7
Linux Linux kernel=3.2.8
Linux Linux kernel=3.2.9
Linux Linux kernel=3.2.10
Linux Linux kernel=3.2.11
Linux Linux kernel=3.2.12
Linux Linux kernel=3.2.13
Linux Linux kernel=3.2.14
Linux Linux kernel=3.2.15
Linux Linux kernel=3.2.16
Linux Linux kernel=3.2.17
Linux Linux kernel=3.2.18
Linux Linux kernel=3.2.19
Linux Linux kernel=3.2.20
Linux Linux kernel=3.2.21
Linux Linux kernel=3.2.22
Linux Linux kernel=3.2.23
Linux Linux kernel=3.2.24
Linux Linux kernel=3.2.25
Linux Linux kernel=3.2.26
Linux Linux kernel=3.2.27
Linux Linux kernel=3.2.28
Linux Linux kernel=3.2.29
Linux Linux kernel=3.2.30
Linux Linux kernel=3.3
Linux Linux kernel=3.3-rc1
Linux Linux kernel=3.3-rc2
Linux Linux kernel=3.3-rc3
Linux Linux kernel=3.3-rc4
Linux Linux kernel=3.3-rc5
Linux Linux kernel=3.3-rc6
Linux Linux kernel=3.3-rc7
Linux Linux kernel=3.3.1
Linux Linux kernel=3.3.2
Linux Linux kernel=3.3.3
Linux Linux kernel=3.3.4
Linux Linux kernel=3.3.5
Linux Linux kernel=3.3.6
Linux Linux kernel=3.3.7
Linux Linux kernel=3.3.8
Linux Linux kernel=3.4
Linux Linux kernel=3.4-rc1
Linux Linux kernel=3.4-rc2
Linux Linux kernel=3.4-rc3
Linux Linux kernel=3.4-rc4
Linux Linux kernel=3.4-rc5
Linux Linux kernel=3.4-rc6
Linux Linux kernel=3.4-rc7
Linux Linux kernel=3.4.1
Linux Linux kernel=3.4.2
Linux Linux kernel=3.4.3
Linux Linux kernel=3.4.4
Linux Linux kernel=3.4.5
Linux Linux kernel=3.4.6
Linux Linux kernel=3.4.7
Linux Linux kernel=3.4.8
Linux Linux kernel=3.4.9
Linux Linux kernel=3.4.10
Linux Linux kernel=3.4.11
Linux Linux kernel=3.4.12
Linux Linux kernel=3.4.13
Linux Linux kernel=3.4.14
Linux Linux kernel=3.4.15
Linux Linux kernel=3.4.16
Linux Linux kernel=3.4.17
Linux Linux kernel=3.4.18
Linux Linux kernel=3.4.19
Linux Linux kernel=3.4.20
Linux Linux kernel=3.4.21
Linux Linux kernel=3.4.22
Linux Linux kernel=3.4.23
Linux Linux kernel=3.4.24
Linux Linux kernel=3.4.25
Linux Linux kernel=3.4.26
Linux Linux kernel=3.4.27
Linux Linux kernel=3.4.28
Linux Linux kernel=3.4.29
Linux Linux kernel=3.4.30
Linux Linux kernel=3.4.31
Linux Linux kernel=3.4.32
Linux Linux kernel=3.5.1
Linux Linux kernel=3.5.2
Linux Linux kernel=3.5.3
Linux Linux kernel=3.5.4
Linux Linux kernel=3.5.5
Linux Linux kernel=3.5.6
Linux Linux kernel=3.5.7
Linux Linux kernel=3.6
Linux Linux kernel=3.6.1
Linux Linux kernel=3.6.2
Linux Linux kernel=3.6.3
Linux Linux kernel=3.6.4
Linux Linux kernel=3.6.5
Linux Linux kernel=3.6.6
Linux Linux kernel=3.6.7
Linux Linux kernel=3.6.8
Linux Linux kernel=3.6.9
Linux Linux kernel=3.6.10
Linux Linux kernel=3.6.11
Linux Linux kernel=3.7
Linux Linux kernel=3.7.1
Linux Linux kernel=3.7.2
Linux Linux kernel=3.7.3
Linux Linux kernel=3.7.4
Linux Linux kernel=3.7.5
Linux Linux kernel=3.7.6
Linux Linux kernel=3.7.7
Linux Linux kernel=3.7.8
Linux Linux kernel=3.7.9
Linux Linux kernel=3.7.10
Linux Linux kernel=3.8.0
Linux Linux kernel=3.8.1
Linux Linux kernel=3.8.2
Linux Linux kernel=3.8.3
Linux Linux kernel=3.8.4
Linux Linux kernel=3.8.5
Linux Linux kernel=3.8.6
Linux Linux kernel=3.8.7
Linux Linux kernel=3.8.8
Linux Linux kernel=3.8.9
Linux Linux kernel=3.8.10
Linux Linux kernel=3.8.11
Linux Linux kernel=3.8.12
Linux Linux kernel=3.8.13
Linux Linux kernel=3.9-rc1
Linux Linux kernel=3.9-rc2
Linux Linux kernel=3.9-rc3
Linux Linux kernel=3.9-rc4
Linux Linux kernel=3.9-rc5
Linux Linux kernel=3.9-rc6
Linux Linux kernel=3.9-rc7
Linux Linux kernel=3.9.0
Linux Linux kernel=3.9.1
Linux Linux kernel=3.9.2
Linux Linux kernel=3.9.3
Linux Linux kernel=3.9.4
Linux Linux kernel=3.9.5
Linux Linux kernel=3.9.6
Linux Linux kernel=3.9.7
Linux Linux kernel=3.9.8
Linux Linux kernel=3.9.9
Linux Linux kernel=3.9.10
Linux Linux kernel=3.9.11
Linux Linux kernel=3.10.1
Linux Linux kernel=3.10.2
Linux Linux kernel=3.10.3
Linux Linux kernel=3.10.4
Linux Linux kernel=3.10.5
Linux Linux kernel=3.10.6
Linux Linux kernel=3.10.7
Linux Linux kernel=3.10.8
Linux Linux kernel=3.10.9
Linux Linux kernel=3.10.10
Linux Linux kernel=3.10.11
Linux Linux kernel=3.10.12
Linux Linux kernel=3.10.13
Linux Linux kernel=3.10.14
Linux Linux kernel=3.10.15
Linux Linux kernel=3.10.16
Linux Linux kernel=3.10.17
Linux Linux kernel=3.10.18
Linux Linux kernel=3.11
Linux Linux kernel=3.11.1
Linux Linux kernel=3.11.2
Linux Linux kernel=3.11.3
debian/linux
5.10.223-15.10.234-16.1.129-16.1.133-16.12.22-1
Remediation
Event History
Nov 7, 2013
Data Sourced
via Red Hat·11:28 AM
DescriptionSeverityAffected Software
Dec 9, 2013
CVE Published
via MITRE·06:00 PM
Data Sourced
via MITRE·06:00 PM
Description
Jan 11, 2024
Data Sourced
via Launchpad·10:02 PM
Description
Sep 16, 2024
Data Sourced
via Ubuntu·01:00 AM
RemedyDescriptionSeverityAffected Software
Apr 24, 2025
Data Sourced
via Debian·02:07 AM
DescriptionAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2013-4270?
CVE-2013-4270 is classified as a moderate severity vulnerability, allowing unprivileged local users to bypass file access restrictions.
2
How do I fix CVE-2013-4270?
To fix CVE-2013-4270, upgrade the Linux kernel to version 3.11.5 or newer, ensuring you are on a patched version.
3
What systems are affected by CVE-2013-4270?
CVE-2013-4270 affects various versions of the Linux kernel prior to 3.11.5, including versions 3.0 to 3.11.4.
4
Who can exploit CVE-2013-4270?
CVE-2013-4270 can be exploited by any unprivileged local user with access to the system.
5
What are the potential impacts of CVE-2013-4270?
The potential impacts of CVE-2013-4270 include unauthorized access to sensitive files in the /proc/sys/net directory.