CVE-2015-8660

HIGH

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.

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/

Details

Source: MITRE

Published: 2015-12-28

Updated: 2017-09-10

Type: CWE-264

Risk Information

CVSS v2.0

Base Score: 7.2

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

CVSS v3.0

Base Score: 6.7

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

Impact Score: 5.9

Exploitability Score: 0.8

Severity: MEDIUM