CVE-2014-8989

MEDIUM

Description

The Linux kernel through 3.17.4 does not properly restrict dropping of supplemental group memberships in certain namespace scenarios, which allows local users to bypass intended file permissions by leveraging a POSIX ACL containing an entry for the group category that is more restrictive than the entry for the other category, aka a "negative groups" issue, related to kernel/groups.c, kernel/uid16.c, and kernel/user_namespace.c.

References

http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147864.html

http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147973.html

http://thread.gmane.org/gmane.linux.man/7385/

http://www.mandriva.com/security/advisories?name=MDVSA-2015:058

http://www.openwall.com/lists/oss-security/2014/11/20/4

http://www.securityfocus.com/bid/71154

http://www.ubuntu.com/usn/USN-2515-1

http://www.ubuntu.com/usn/USN-2516-1

http://www.ubuntu.com/usn/USN-2517-1

http://www.ubuntu.com/usn/USN-2518-1

Details

Source: MITRE

Published: 2014-11-30

Updated: 2017-01-03

Type: CWE-264

Risk Information

CVSS v2.0

Base Score: 4.6

Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P)

Impact Score: 6.4

Exploitability Score: 3.9

Severity: MEDIUM