7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
6.6 Medium
AI Score
Confidence
Low
0.0004 Low
EPSS
Percentile
5.1%
The clone system-call implementation in the Linux kernel before 3.8.3 does not properly handle a combination of the CLONE_NEWUSER and CLONE_FS flags, which allows local users to gain privileges by calling chroot and leveraging the sharing of the / directory between a parent process and a child process.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=e66eded8309ebf679d3d3c1f5820d1f2ca332c71
stealth.openwall.net/xSports/clown-newuser.c
www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.3
www.openwall.com/lists/oss-security/2013/03/14/6
bugzilla.redhat.com/show_bug.cgi?id=921448
github.com/torvalds/linux/commit/e66eded8309ebf679d3d3c1f5820d1f2ca332c71