SB2014113003 - Permissions, Privileges, and Access Controls in Linux kernel 

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Main Vulnerability Database SB2014113003

SB2014113003 - Permissions, Privileges, and Access Controls in Linux kernel

Published: November 30, 2014 Updated: August 9, 2020

Security Bulletin ID SB2014113003
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2014-8989)

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The Linux kernel through 3.17.4 does not properly restrict dropping of supplemental group memberships in certain namespace scenarios, which allows local users to bypass intended file permissions by leveraging a POSIX ACL containing an entry for the group category that is more restrictive than the entry for the other category, aka a "negative groups" issue, related to kernel/groups.c, kernel/uid16.c, and kernel/user_namespace.c.


Remediation

Install update from vendor's website.

References