Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-33626

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
01/10/2021
Last modified:
24/04/2022

Description

A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer(QWORD values for CommBuffer). This can be used by an attacker to corrupt data in SMRAM memory and even lead to arbitrary code execution.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.80
Severity 3.x
HIGH
Vector 2.0
AV:L/AC:L/Au:N/C:P/I:P/A:P CVSS v2.0 Severity and Metrics:

Base Score: 4.60 MEDIUM
Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

Attack Vector (AV): Local
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): Physical
Availability (A): Physical

Base Score 2.0
4.60
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* 5.3 (including) 5.34.44 (excluding)
cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* 5.2 (including) 5.25.44 (excluding)
cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* 5.1 (including) 5.16.25 (excluding)
cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* 5.4 (including) 5.42.44 (excluding)
cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* 5.3 (including) 5.35.25 (excluding)
cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* 5.2 (including) 5.26.25 (excluding)
cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:* 5.4 (including) 5.43.25 (excluding)
cpe:2.3:o:siemens:ruggedcom_apr1808_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:ruggedcom_apr1808:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_field_pg_m5_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_field_pg_m5:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_field_pg_m6_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_field_pg_m6:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_ipc127e_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc127e:-:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools