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Vulnerability Details : CVE-2015-8660

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.
Publish Date : 2015-12-28 Last Update Date : 2017-09-09
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- CVSS Scores & Vulnerability Types

CVSS Score
7.2
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Bypass a restriction or similar
CWE ID 264

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2016:1539: kernel security and bug fix update (Important) oval:com.redhat.rhsa:def:20161539 unix
RHSA-2016:1541: kernel-rt security and bug fix update (Important) oval:com.redhat.rhsa:def:20161541 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2015-8660

# Product Type Vendor Product Version Update Edition Language
1 OS Linux Linux Kernel 4.3.2 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Linux Linux Kernel 1

- References For CVE-2015-8660

https://www.exploit-db.com/exploits/39230/
EXPLOIT-DB 39230
https://www.exploit-db.com/exploits/40688/
EXPLOIT-DB 40688
https://www.exploit-db.com/exploits/39166/
EXPLOIT-DB 39166
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=acff81ec2c79492b180fade3c2894425cd35a545 CONFIRM
https://bugzilla.redhat.com/show_bug.cgi?id=1291329 CONFIRM
http://www.ubuntu.com/usn/USN-2858-3
UBUNTU USN-2858-3
http://www.ubuntu.com/usn/USN-2858-2
UBUNTU USN-2858-2
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html CONFIRM
http://www.securitytracker.com/id/1034548
SECTRACK 1034548
http://www.ubuntu.com/usn/USN-2857-1
UBUNTU USN-2857-1
http://www.ubuntu.com/usn/USN-2857-2
UBUNTU USN-2857-2
http://www.ubuntu.com/usn/USN-2858-1
UBUNTU USN-2858-1
http://rhn.redhat.com/errata/RHSA-2016-1532.html
REDHAT RHSA-2016:1532
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html CONFIRM
http://packetstormsecurity.com/files/135151/Ubuntu-14.04-LTS-15.10-overlayfs-Local-Root.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00040.html
SUSE SUSE-SU-2016:0752
http://rhn.redhat.com/errata/RHSA-2016-1539.html
REDHAT RHSA-2016:1539
http://rhn.redhat.com/errata/RHSA-2016-1541.html
REDHAT RHSA-2016:1541
https://github.com/torvalds/linux/commit/acff81ec2c79492b180fade3c2894425cd35a545 CONFIRM
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00043.html
SUSE SUSE-SU-2016:0755
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00039.html
SUSE SUSE-SU-2016:0751
http://www.securityfocus.com/bid/79671
BID 79671 Linux Kernel 'fs/overlayfs/inode.c' Local Privilege Escalation Vulnerability Release Date:2016-08-30
http://www.openwall.com/lists/oss-security/2015/12/23/5
MLIST [oss-security] 20151223 CVE request -- linux kernel: overlay: fix permission checking for setattr

- Metasploit Modules Related To CVE-2015-8660

Overlayfs Privilege Escalation
This module attempts to exploit two different CVEs related to overlayfs. CVE-2015-1328: Ubuntu specific -> 3.13.0-24 (14.04 default) < 3.13.0-55 3.16.0-25 (14.10 default) < 3.16.0-41 3.19.0-18 (15.04 default) < 3.19.0-21 CVE-2015-8660: Ubuntu: 3.19.0-18 < 3.19.0-43 4.2.0-18 < 4.2.0-23 (14.04.1, 15.10) Fedora: < 4.2.8 (vulnerable, un-tested) Red Hat: < 3.10.0-327 (rhel 6, vulnerable, un-tested)
Module type : exploit Rank : good Platforms : Linux


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