SB2014091918 - Amazon Linux AMI update for kernel

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Main Vulnerability Database SB2014091918

SB2014091918 - Amazon Linux AMI update for kernel

Published: September 19, 2014

Security Bulletin ID SB2014091918
Severity
High
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2014-5206)

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The do_remount function in fs/namespace.c in the Linux kernel through 3.16.1 does not maintain the MNT_LOCK_READONLY bit across a remount of a bind mount, which allows local users to bypass an intended read-only restriction and defeat certain sandbox protection mechanisms via a "mount -o remount" command within a user namespace.


2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2014-5207)

The vulnerability allows a local #AU# to execute arbitrary code.

fs/namespace.c in the Linux kernel through 3.16.1 does not properly restrict clearing MNT_NODEV, MNT_NOSUID, and MNT_NOEXEC and changing MNT_ATIME_MASK during a remount of a bind mount, which allows local users to gain privileges, interfere with backups and auditing on systems that had atime enabled, or cause a denial of service (excessive filesystem updating) on systems that had atime disabled via a "mount -o remount" command within a user namespace.


Remediation

Install update from vendor's website.

References