CVE-2014-4014

Published: 23 June 2014

The capabilities implementation in the Linux kernel before 3.14.8 does not properly consider that namespaces are inapplicable to inodes, which allows local users to bypass intended chmod restrictions by first creating a user namespace, as demonstrated by setting the setgid bit on a file with group ownership of root.

From the Ubuntu Security Team

A flaw was discovered in the Linux kernel's implementation of user namespaces with respect to inode permissions. A local user could exploit this flaw by creating a user namespace to gain administrative privileges.

Notes

android kernels (goldfish, grouper, maguro, mako and manta) are not
supported on the Ubuntu Touch 13.10 preview kernels
android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.04 preview kernels

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4014
• https://ubuntu.com/security/notices/USN-2285-1
• https://ubuntu.com/security/notices/USN-2286-1
• https://ubuntu.com/security/notices/USN-2287-1
• https://ubuntu.com/security/notices/USN-2289-1
• https://ubuntu.com/security/notices/USN-2336-1
• https://ubuntu.com/security/notices/USN-2337-1
• NVD
• Launchpad
• Debian

Bugs

• https://launchpad.net/bugs/1329103