CVE-2016-2854

Description

The aufs module for the Linux kernel 3.x and 4.x does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.

CVSS Metrics

• v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
• v2.0•MEDIUM•Score: 4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.35%• Percentile: 58%

Techniques & Countermeasures

• CWE-269•Improper Privilege Management

  The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Affected Systems

• linux•linux_kernel

  ≥ 3.0.0, ≤ 3.19.8 | ≥ 4.0.0, ≤ 4.20.15

References (4)

• http://www.halfdog.net/Security/2016/AufsPrivilegeEscalationInUserNamespaces/
• http://www.openwall.com/lists/oss-security/2016/02/24/9
• https://sourceforge.net/p/aufs/mailman/message/34864744/
• http://www.securityfocus.com/bid/96838