#VU65801 Resource exhaustion in Xen - CVE-2022-33745

Vulnerability identifier: #VU65801

Vulnerability risk: Medium

CVSSv4.0: 5.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green]

CVE-ID: CVE-2022-33745

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to an error in code responsible for migration and work around of kernels unaware of L1TF in shadow mode, related to TLB flush. A remote user with access to x86 PV guest can start the migration process to trigger the vulnerability and exhaust all available memory, resulting in a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: 4.13.0 - 4.14.5

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External links
https://xenbits.xenproject.org/xsa/advisory-408.txt

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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.