CVE-2015-3339

Published: 21 April 2015

Race condition in the prepare_binprm function in fs/exec.c in the Linux kernel before 3.19.6 allows local users to gain privileges by executing a setuid program at a time instant when a chown to root is in progress, and the ownership is changed but the setuid bit is not yet stripped.

From the Ubuntu security team

A race condition between chown() and execve() was discovered in the Linux kernel. A local attacker could exploit this race by using chown on a setuid-user-binary to gain administrative privileges.

Status

Notes

android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3339
• http://www.openwall.com/lists/oss-security/2015/04/20/1
• https://ubuntu.com/security/notices/USN-2583-1
• https://ubuntu.com/security/notices/USN-2584-1
• https://ubuntu.com/security/notices/USN-2596-1
• https://ubuntu.com/security/notices/USN-2597-1
• https://ubuntu.com/security/notices/USN-2598-1
• https://ubuntu.com/security/notices/USN-2599-1
• https://ubuntu.com/security/notices/USN-2600-1
• https://ubuntu.com/security/notices/USN-2601-1
• https://ubuntu.com/security/notices/USN-2612-1
• NVD
• Launchpad
• Debian

Bugs

• https://launchpad.net/bugs/1447373