SB2020092336 - Resource management error in xen (Alpine package)

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2020092336

SB2020092336 - Resource management error in xen (Alpine package)

Published: September 23, 2020

Security Bulletin ID SB2020092336
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Resource management error (CVE-ID: CVE-2020-25598)

CWE-ID: CWE-399 - Resource Management Errors

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to missing unlock in XENMEM_acquire_resource error path in Xen. A malicious HVM stubdomain can cause an RCU reference to be leaked.  This causes subsequent administration operations, (e.g. CPU offline) to livelock, resulting in a host denial of service.

The vulnerability only affects VMs using HVM stubdomains.


Remediation

Install update from vendor's website.

References