CVE-2022-33986

15.11.2022, 00:15

DMA attacks on the parameter buffer used by the VariableRuntimeDxe software SMI handler could lead to a TOCTOU attack. DMA attacks on the parameter buffer used by the software SMI handler used by the driver VariableRuntimeDxe could lead to a TOCTOU attack on the SMI handler and lead to corruption of SMRAM. This issue was discovered by Insyde engineering during a security review. This issue is fixed in Kernel 5.4: 05.44.23 and Kernel 5.5: 05.52.23. CWE-367 CWE-367 Report at: https://www.insyde.com/security-pledge/SA-2022056

TOCTOU

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	6.4 MEDIUM	LOCAL	HIGH	HIGH	CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
mitre	CNA	---				---
CVE	ADP	---				---
CISA-ADP	ADP	6.4 MEDIUM	LOCAL	HIGH	HIGH	CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 8%

Vendor	Product	Version
insyde	kernel	5.4 ≤ 𝑥 < 5.4.05.44.23
insyde	kernel	5.5 ≤ 𝑥 < 5.5.05.52.23

𝑥

= Vulnerable software versions

Common Weakness Enumeration

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
The software checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the software to perform invalid actions when the resource is in an unexpected state.

References

https://www.insyde.com/security-pledge

https://www.insyde.com/security-pledge/SA-2022056

https://www.insyde.com/security-pledge

https://www.insyde.com/security-pledge/SA-2022056