Special register buffer speculative side channel attack in Xen



Published: 2020-06-10
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-0543
CWE-ID CWE-200
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Xen
Server applications / Virtualization software

Vendor Xen Project

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Information disclosure

EUVDB-ID: #VU28928

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-0543

CWE-ID: CWE-200 - Information Exposure

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to incomplete cleanup from specific special register read operations in some Intel(R) Processors. A local user can gain unauthorized access to sensitive information on the system.

Mitigation

Apply patched, issued by the vendor:

xsa320/xsa320-1.patch
xsa320/xsa320-2.patch
xsa320/xsa320-4.9-1.patch
xsa320/xsa320-4.9-2.patch
xsa320/xsa320-4.10-1.patch
xsa320/xsa320-4.10-2.patch
xsa320/xsa320-4.11-1.patch
xsa320/xsa320-4.11-2.patch
xsa320/xsa320-4.12-1.patch
xsa320/xsa320-4.12-2.patch
xsa320/xsa320-4.13-1.patch
xsa320/xsa320-4.13-2.patch

Vulnerable software versions

Xen: 2.0 - 25588


CPE2.3 External links

http://xenbits.xen.org/xsa/advisory-320.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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



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