SB2017052515 - Multiple vulnerabilities in Linux Kernel

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Main Vulnerability Database SB2017052515

SB2017052515 - Multiple vulnerabilities in Linux Kernel

Published: May 15, 2017

Security Bulletin ID SB2017052515
Severity
Low
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 secuirty vulnerabilities.


1) Security restrictions bypass (CVE-ID: CVE-2016-9604)

The vulnerability allows a local attacker to write arbitrary files on the target system.

The weakness exists due to root can gain direct access to an internal keyring, such as '.dns_resolver' or '.builtin_trusted_keys' upstream, by joining it as its session keyring. A local attacker can bypass module signature verification by adding a new public key of its own devising to the keyring.

2) Information disclosure (CVE-ID: CVE-2015-8944)

The vulnerability allows a local attacker to obtain potentially sensitive information on the target system.

The weakness exists due to weak permissions for /proc/iomem used by the ioresources_init function in kernel/resource.c in the Linux kernel. A local attacker can read arbitrary file on the system.

3) Privilege escalation (CVE-ID: CVE-2016-7097)

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to the setgid bit being preserved during a setxattr call by the filesystem implementation. A local attacker can leverage the existence of a setgid program to gain group privileges.

Successful exploitation of the vulnerability results in privileges escalation.

Remediation

Install update from vendor's website.

References