CVE-2016-1576 Information

Description

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 Vector

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

Reference

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/ http://www.openwall.com/lists/oss-security/2016/02/24/8 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

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8