#VU17905 Improper access control in Xen - CVE-2019-17342
Published: March 6, 2019 / Updated: July 28, 2020
Vulnerability identifier: #VU17905
Vulnerability risk: Low
CVSSv4.0: 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/E:U/U:Clear
CVE-ID: CVE-2019-17342
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Xen
Xen
Software vendor:
Xen Project
Xen Project
Description
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.
Remediation
Apply the following patches: