#VU58343 Permissions, Privileges, and Access Controls in Xen


Published: 2021-11-24

Vulnerability identifier: #VU58343

Vulnerability risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28703

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

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


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


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.


Latest bulletins with this vulnerability