Mount.ecryptfs_private.c in eCryptfs-utils does not validate mount filesystem

National Cyber Awareness System Vulnerability Summary for CVE-2016-1572

Original release date: 01/22/2016

Last revised: 06/09/2016

Source: US-CERT/NIST

Overview

mount.ecryptfs_private.c in eCryptfs-utils does not validate mount destination filesystem types, which allows local users to gain privileges by mounting over a nonstandard filesystem, as demonstrated by /proc/$pid.

Impact CVSS Severity (version 3.0):

CVSS v3 Base Score: 8.4 High

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

Impact Score: 5.9

Exploitability Score: 2.5

CVSS Version 3 Metrics:

Attack Vector (AV): Local

Attack Complexity (AC): Low

Privileges Required (PR): None

User Interaction (UI): None

Scope (S): Unchanged

Confidentiality (C): High

Integrity (I): High

Availability (A): High

CVSS Severity (version 2.0):

CVSS v2 Base Score: 4.6 MEDIUM

Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P) ( legend )

Impact Subscore: 6.4

Exploitability Subscore: 3.9

CVSS Version 2 Metrics:

Access Vector: Locally exploitable

Access Complexity: Low

Authentication: Not required to exploit

Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service

References to Advisories, Solutions, and Tools

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External Source: MLIST

Name: [oss-security] 20160120 Security issue in eCryptfs-utils (CVE-2016-1572)

Hyperlink: http://www.openwall.com/lists/oss-security/2016/01/20/6

External Source: CONFIRM

Name: https://bugs.launchpad.net/ecryptfs/+bug/1530566

Type: Advisory

Hyperlink: https://bugs.launchpad.net/ecryptfs/+bug/1530566

External Source: UBUNTU

Name: USN-2876-1

Type: Patch Information

Hyperlink: http://www.ubuntu.com/usn/USN-2876-1

External Source: CONFIRM