CVE-2016-1576

Severity

72%

Complexity

39%

Confidentiality

165%

The overlayfs implementation in the Linux kernel through 4.5.2 does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an overlayfs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program.

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 8 years ago

2016-05-02 10:59:00

Last updated 8 years ago

2016-05-06 12:57:00

Affected Software

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

Linux Kernel

References

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

http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1576.html

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

Exploit

[oss-security] 20160224 Overlayfs over Fuse Privilege Escalation in USERNS

https://bugs.launchpad.net/bugs/1535150

https://launchpadlibrarian.net/235300093/0005-overlayfs-Be-more-careful-about-copying-up-sxid-file.patch

https://launchpadlibrarian.net/235300225/0006-overlayfs-Propogate-nosuid-from-lower-and-upper-moun.patch

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