Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 3.17.3 |
Related Weaknesses (CWE)
References
- http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147864.ht
- http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147973.ht
- http://thread.gmane.org/gmane.linux.man/7385/Exploit
- 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
- http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147864.ht
- http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147973.ht
- http://thread.gmane.org/gmane.linux.man/7385/Exploit
- http://www.mandriva.com/security/advisories?name=MDVSA-2015:058
- http://www.openwall.com/lists/oss-security/2014/11/20/4
FAQ
What is CVE-2014-8989?
CVE-2014-8989 is a vulnerability with a CVSS score of 4.6 (MEDIUM). 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 le...
How severe is CVE-2014-8989?
CVE-2014-8989 has been rated MEDIUM with a CVSS base score of 4.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2014-8989?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.