CVE-2016-1575

Severity

72%

Complexity

39%

Confidentiality

165%

The overlayfs implementation in the Linux kernel through 4.5.2 does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.

CVSS 3.0 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 7.2. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:C/I:C/A:C).

Overview

First reported 9 years ago

2016-05-02 10:59:00

Last updated 8 years ago

2017-05-08 15:31:00

Affected Software

Linux Kernel

Canonical Ubuntu Core 15.04

15.04

Canonical Ubuntu Linux 12.04 LTS

12.04

Canonical Ubuntu Linux 14.04 LTS (Long-Term Support)

14.04

Canonical Ubuntu Linux 15.10

15.10

Canonical Ubuntu Linux 16.04 LTS (Long-Term Support)

16.04

Canonical Ubuntu Linux 16.10

16.10

Canonical Ubuntu Touch 15.04

15.04

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e9f57ebcba563e0cd532926cab83c92bb4d79360

Patch, Vendor Advisory

http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1575.html

Third Party Advisory

http://www.halfdog.net/Security/2016/UserNamespaceOverlayfsXattrSetgidPrivilegeEscalation/

Exploit, Third Party Advisory

[oss-security] 20160224 User Namespaces Overlayfs Xattr Setgid Privilege Escalation: Overlayfs

Mailing List, Third Party Advisory

https://launchpad.net/bugs/1534961