Allocation of Resources Without Limits or Throttling in Xen



Published: 2020-12-15 | Updated: 2020-12-23
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-29486
CWE-ID CWE-770
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Xen
Server applications / Virtualization software

Vendor Xen Project

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Allocation of Resources Without Limits or Throttling

EUVDB-ID: #VU49136

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2020-29486

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

Exploit availability: No

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Xen: 4.0.0 - 4.14.1


CPE2.3 External links

http://www.debian.org/security/2020/dsa-4812
http://xenbits.xenproject.org/xsa/advisory-352.html

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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