CVE-2019-18425

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Summary

CVECVE-2019-18425
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2019-10-31 14:15:00 UTC
Updated2023-11-07 03:06:00 UTC
DescriptionAn issue was discovered in Xen through 4.12.x allowing 32-bit PV guest OS users to gain guest OS privileges by installing and using descriptors. There is missing descriptor table limit checking in x86 PV emulation. When emulating certain PV guest operations, descriptor table accesses are performed by the emulating code. Such accesses should respect the guest specified limits, unless otherwise guaranteed to fail in such a case. Without this, emulation of 32-bit guest user mode calls through call gates would allow guest user mode to install and then use descriptors of their choice, as long as the guest kernel did not itself install an LDT. (Most OSes don't install any LDT by default). 32-bit PV guest user mode can elevate its privileges to that of the guest kernel. Xen versions from at least 3.2 onwards are affected. Only 32-bit PV guest user mode can leverage this vulnerability. HVM, PVH, as well as 64-bit PV guests cannot leverage this vulnerability. Arm systems are unaffected.

Risk And Classification

Problem Types: CWE-269

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 9.0 All All All
Operating System Fedoraproject Fedora 29 All All All
Operating System Fedoraproject Fedora 30 All All All
Operating System Fedoraproject Fedora 31 All All All
Operating System Opensuse Leap 15.0 All All All
Operating System Xen Xen All All All All

References

ReferenceSourceLinkTags
Debian -- Security Information -- DSA-4602-1 xen DEBIAN www.debian.org
Xen: Multiple vulnerabilities (GLSA 202003-56) — Gentoo security GENTOO security.gentoo.org
[SECURITY] Fedora 30 Update: xen-4.11.2-3.fc30 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 29 Update: xen-4.11.2-2.fc29 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
oss-security - Xen Security Advisory 298 v3 (CVE-2019-18425) - missing descriptor table limit checking in x86 PV emulation MLIST www.openwall.com Mailing List, Third Party Advisory
[SECURITY] Fedora 29 Update: xen-4.11.2-2.fc29 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
Bugtraq: [SECURITY] [DSA 4602-1] xen security update BUGTRAQ seclists.org
[security-announce] openSUSE-SU-2019:2506-1: important: Security update SUSE lists.opensuse.org
[SECURITY] Fedora 31 Update: xen-4.12.1-6.fc31 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
XSA-298 - Xen Security Advisories MISC xenbits.xen.org Patch, Vendor Advisory
[SECURITY] Fedora 31 Update: xen-4.12.1-6.fc31 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 30 Update: xen-4.11.2-3.fc30 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 500754 Alpine Linux Security Update for xen
  • 504531 Alpine Linux Security Update for xen
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