CVE-2013-1956

2013-04-2400:00:00

ubuntu.com

2.1 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.0004 Low

EPSS

Percentile

5.1%

JSON

The create_user_ns function in kernel/user_namespace.c in the Linux kernel
before 3.8.6 does not check whether a chroot directory exists that differs
from the namespace root directory, which allows local users to bypass
intended filesystem restrictions via a crafted clone system call.

Bugs

<https://launchpad.net/bugs/1170064>

Notes

Author	Note
henrix	According to the author of the fix[1], kernels older than 3.8 simply not enough things were converted for most people to build a kernel with user namespaces enabled. [1] https://lkml.org/lkml/2013/10/22/349