Off-by-one in Xen - #VU48639
Published: November 24, 2020
Vulnerability identifier: #VU48639
CSH Severity: Medium
CVSS v4: 7.5 [CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-193
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to an off-by-one error. A local user on the HVM or PVH system can run a specially crafted program on the guest OS, trigger an off-by-one error and execute arbitrary code on the hypervisor.
Note, the vulnerability exists due to incorrect patch of vulnerability #VU48638.
Affected software
Xen
Remediation
Install updates from vendor's website.