CVE-2020-25602

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Summary

CVECVE-2020-25602
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-09-23 22:15:00 UTC
Updated2023-11-07 03:20:00 UTC
DescriptionAn issue was discovered in Xen through 4.14.x. An x86 PV guest can trigger a host OS crash when handling guest access to MSR_MISC_ENABLE. When a guest accesses certain Model Specific Registers, Xen first reads the value from hardware to use as the basis for auditing the guest access. For the MISC_ENABLE MSR, which is an Intel specific MSR, this MSR read is performed without error handling for a #GP fault, which is the consequence of trying to read this MSR on non-Intel hardware. A buggy or malicious PV guest administrator can crash Xen, resulting in a host Denial of Service. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only Xen versions 4.11 and onwards are vulnerable. 4.10 and earlier are not vulnerable. Only x86 systems that do not implement the MISC_ENABLE MSR (0x1a0) are vulnerable. AMD and Hygon systems do not implement this MSR and are vulnerable. Intel systems do implement this MSR and are not vulnerable. Other manufacturers have not been checked. Only x86 PV guests can exploit the vulnerability. x86 HVM/PVH guests cannot exploit the vulnerability.

Risk And Classification

Problem Types: CWE-755

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Fedoraproject Fedora 31 All All All
Operating System Fedoraproject Fedora 32 All All All
Operating System Fedoraproject Fedora 33 All All All
Operating System Opensuse Leap 15.2 All All All
Operating System Xen Xen All All All All

References

ReferenceSourceLinkTags
[SECURITY] Fedora 32 Update: xen-4.13.1-6.fc32 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
Xen: Multiple vulnerabilities (GLSA 202011-06) — Gentoo security GENTOO security.gentoo.org
[SECURITY] Fedora 33 Update: xen-4.14.0-5.fc33 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
XSA-333 - Xen Security Advisories MISC xenbits.xen.org Patch, Vendor Advisory
[SECURITY] Fedora 31 Update: xen-4.12.3-5.fc31 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
[SECURITY] Fedora 31 Update: xen-4.12.3-5.fc31 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 32 Update: xen-4.13.1-6.fc32 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org Third Party Advisory
[security-announce] openSUSE-SU-2020:1608-1: important: Security update SUSE lists.opensuse.org Third Party Advisory
Debian -- Security Information -- DSA-4769-1 xen DEBIAN www.debian.org Third Party Advisory
[SECURITY] Fedora 33 Update: xen-4.14.0-5.fc33 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 198943 Ubuntu Security Notification for Xen Vulnerabilities (USN-5617-1)
  • 500792 Alpine Linux Security Update for xen
  • 501512 Alpine Linux Security Update for xen
  • 504536 Alpine Linux Security Update for xen
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