#VU83162 Permissions, Privileges, and Access Controls in Xen - CVE-2023-46835

Vulnerability identifier: #VU83162

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-46835

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 guest to gain access to sensitive information.

The vulnerability exists due to improperly imposed security restrictions caused by a mismatch in IOMMU quarantine page table levels. A device in quarantine mode can access data from previous quarantine page table usages, possibly leaking data used by previous domains that also had the device assigned.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: All versions

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External links
https://xenbits.xen.org/xsa/advisory-445.html

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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.