BTC/SRSO protections bypass in Xen



Published: 2023-11-15
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-46836
CWE-ID CWE-254
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Xen
Server applications / Virtualization software

Vendor Xen Project

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Security features bypass

EUVDB-ID: #VU83163

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-46836

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

The vulnerability allows a remote guest to bypass implemented security restrictions.

The vulnerability exists due to improper implementation of mitigations against BTC/SRSO. A malicious guest can bypass BTC/SRSO protections and launch a BTC/SRSO attack against Xen, which can result in memory access to other guests.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Xen: All versions

External links

http://xenbits.xen.org/xsa/advisory-446.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker 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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