#VU73893 Use-after-free in Xen - CVE-2022-42332

Vulnerability identifier: #VU73893

Vulnerability risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-42332

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows an attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when guests are running in the shadow mode. An attacker with access to the guest OS can trigger a use-after-free error and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: All versions

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External links
https://xenbits.xenproject.org/xsa/advisory-427.txt
https://www.openwall.com/lists/oss-security/2023/03/21/1
https://xenbits.xen.org/xsa/advisory-427.html

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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