Denial of service in Xen x86 HVM hypercalls



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-46842
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Xen
Server applications / Virtualization software

Vendor Xen Project

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU88228

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-46842

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a malicious guest to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of register values when invoking a hypercall. A malicious HVM or PVH guest can pass specially crafted input to the hypervisor and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Xen: All versions

CPE2.3 External links

https://xenbits.xen.org/xsa/advisory-454.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.



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