SB2020122328 - Allocation of Resources Without Limits or Throttling in xen (Alpine package) 

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Main Vulnerability Database SB2020122328

SB2020122328 - Allocation of Resources Without Limits or Throttling in xen (Alpine package)

Published: December 23, 2020

Security Bulletin ID SB2020122328
Severity
Low
Patch available
YES
Number of vulnerabilities 1
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 1 security vulnerability.


1) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2020-29486)

The vulnerability allows a local privileged user to a crash the entire system.

An issue was discovered in Xen through 4.14.x. Nodes in xenstore have an ownership. In oxenstored, a owner could give a node away. However, node ownership has quota implications. Any guest can run another guest out of quota, or create an unbounded number of nodes owned by dom0, thus running xenstored out of memory A malicious guest administrator can cause a denial of service against a specific guest or against the whole host. All systems using oxenstored are vulnerable. Building and using oxenstored is the default in the upstream Xen distribution, if the Ocaml compiler is available. Systems using C xenstored are not vulnerable.


Remediation

Install update from vendor's website.

References