Privilege escalation in Xen



Published: 2021-11-24
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-28703
CWE-ID CWE-264
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Xen
Server applications / Virtualization software

Vendor Xen Project

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU58343

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-28703

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to escalate privileges on the system.

The vulnerability exists due to grant table v2 status pages may remain accessible after de-allocation, which leads to security restrictions bypass and privilege escalation.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Xen: 2.0 - 25588

CPE2.3 External links

http://xenbits.xen.org/xsa/advisory-387.html


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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