PT-2020-6150 · Xen · Xen

Published 2020-12-15 · Updated 2021-03-16 · CVE-2020-29485

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Xen versions 4.6 through 4.14.x

Description An issue was discovered when acting upon a guest XS RESET WATCHES request, where not all tracking information is freed. This can cause unbounded memory usage in oxenstored, leading to a system-wide denial of service (DoS). The vulnerability is specific to systems using the Ocaml Xenstored implementation, while systems using the C Xenstored implementation are not affected.

Recommendations For Xen versions 4.6 through 4.14.x, consider disabling the XS RESET WATCHES request handling in oxenstored as a temporary workaround to minimize the risk of exploitation. Restrict access to the oxenstored service to prevent unbounded memory usage. Update to a version that includes the fix for this issue when available.

Fix

DoS

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

BDU:2021-03184

CVE-2020-29485

DSA-4812-1

Affected Products

Xen

References · 21

• https://osv.dev/vulnerability/UBUNTU-CVE-2020-29485 · Vendor Advisory
• https://xenbits.xenproject.org/xsa/advisory-330.txt · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-29485 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-29485 · Security Note
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-29485 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-29485 · Security Note
• https://debian.org/security/2020/dsa-4812 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2020-29485 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-29485 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-03184 · Security Note
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4812-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-29485 · Vendor Advisory