CVE-2016-1237

Ubuntu Security Notice USN-3070-1

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

nfsd in the Linux kernel through 4.6.3 allows local users to bypass intended file-permission restrictions by setting a POSIX ACL, related to nfs2acl.c, nfs3acl.c, and nfs4acl.c.

nfsd en el kernel de Linux hasta la versión 4.6.3 permite a usuarios locales eludir las restricciones destinadas al permiso de archivo ajustando una POSIX ACL relacionada con nfs2acl.c, nfs3acl.c y nfs4acl.c.

A missing permission check when settings ACLs was discovered in nfsd. A local user could exploit this flaw to gain access to any file by setting an ACL. It was discovered that the keyring implementation in the Linux kernel did not ensure a data structure was initialized before referencing it after an error condition occurred. A local attacker could use this to cause a denial of service. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2015-12-27 CVE Reserved
2016-06-28 CVE Published
2024-08-05 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-284: Improper Access Control

CAPEC

References (11)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2016/06/25/2	Mailing List
http://www.securityfocus.com/bid/91456	Vdb Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1350845	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=999653786df6954a31044528ac3f7a5dadca08f4	2016-11-28
http://www.debian.org/security/2016/dsa-3607	2016-11-28
http://www.ubuntu.com/usn/USN-3053-1	2016-11-28
http://www.ubuntu.com/usn/USN-3070-1	2016-11-28
http://www.ubuntu.com/usn/USN-3070-2	2016-11-28
http://www.ubuntu.com/usn/USN-3070-3	2016-11-28
http://www.ubuntu.com/usn/USN-3070-4	2016-11-28
https://github.com/torvalds/linux/commit/999653786df6954a31044528ac3f7a5dadca08f4	2016-11-28

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				<= 4.6.3 Search vendor "Linux" for product "Linux Kernel" and version " <= 4.6.3"		-		Affected