CVE-2015-8660 Information

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.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Reference

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/

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction Required

HIGH

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

6.7