CVE-2016-1575 Information

Description

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 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-2016-1575.html http://www.halfdog.net/Security/2016/UserNamespaceOverlayfsXattrSetgidPrivilegeEscalation/ http://www.openwall.com/lists/oss-security/2016/02/24/7 https://launchpad.net/bugs/1534961

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