Improper access control in Xen - CVE-2019-17342

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Main Vulnerability Database Vulnerabilities #VU17905

Improper access control in Xen - CVE-2019-17342

Published: March 6, 2019 / Updated: July 28, 2020


Vulnerability identifier: #VU17905
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-17342
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the host system.

The vulnerability exists due security violations within the page structure access control implementation with introduction of XENMEM_exchange hypercall. A local user can leak arbitrary amounts of memory or use a cooperating pair of PV and HVM/PVH guests to get a writable pagetable entry and escalate privileges on the host operating system.


Affected software

Xen
Debian Linux
xen (Debian package)

How to mitigate CVE-2019-17342


xen (Debian package) - addressed in versions 4.8.5.final+shim4.10.4-1+deb9u12, 4.11.3+24-g14b62ab3e5-1~deb10u1

External References

Related Security Bulletins