SB2018110805 - Amazon Linux AMI update for kernel

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Main Vulnerability Database SB2018110805

SB2018110805 - Amazon Linux AMI update for kernel

Published: November 8, 2018

Security Bulletin ID SB2018110805
Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Improper input validation (CVE-ID: CVE-2018-18021)

The vulnerability allows a local attacker to cause DoS condition on the target system.

The vulnerability exists in the arch/arm64/kvm/guest.c source code file due to the mishandling of the sanity check for the KVM_SET_ON_REG IOCTL function. A local attacker can create a malicious Kernel-based Virtual Machine (KVM), cause an illegal exception return and cause the system to crash.


2) Improper access control (CVE-ID: CVE-2018-17972)

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists within the proc_pid_stack() function in fs/proc/base.c due to the Linux kernel does not ensure that only root may inspect the kernel stack of an arbitrary task. A local user can exploit racy stack unwinding and leak kernel task stack contents.


Remediation

Install update from vendor's website.

References