CVE-2016-2853

Description

The aufs module for the Linux kernel 3.x and 4.x does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an aufs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program.

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: 4.4AV:L/AC:M/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.22%• Percentile: 45%

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 (5)

• http://www.securityfocus.com/bid/96839
• 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.openwall.com/lists/oss-security/2021/10/18/1