CVE-2015-8660

Description

The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application.

Predictions

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

References

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=acff81ec2c79492b180fade3c2894425cd35a545
• http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00039.html
• http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00040.html
• http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00043.html
• http://packetstormsecurity.com/files/135151/Ubuntu-14.04-LTS-15.10-overlayfs-Local-Root.html
• http://rhn.redhat.com/errata/RHSA-2016-1532.html
• http://rhn.redhat.com/errata/RHSA-2016-1539.html
• http://rhn.redhat.com/errata/RHSA-2016-1541.html
• http://www.openwall.com/lists/oss-security/2015/12/23/5
• http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
• http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
• http://www.securityfocus.com/bid/79671
• http://www.securitytracker.com/id/1034548
• http://www.ubuntu.com/usn/USN-2857-1
• http://www.ubuntu.com/usn/USN-2857-2
• http://www.ubuntu.com/usn/USN-2858-1
• http://www.ubuntu.com/usn/USN-2858-2
• http://www.ubuntu.com/usn/USN-2858-3
• https://bugzilla.redhat.com/show_bug.cgi?id=1291329
• https://github.com/torvalds/linux/commit/acff81ec2c79492b180fade3c2894425cd35a545
• https://www.exploit-db.com/exploits/39166/
• https://www.exploit-db.com/exploits/39230/
• https://www.exploit-db.com/exploits/40688/
• https://security-tracker.debian.org/tracker/CVE-2015-8660

CWEs

CWE-264