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[email protected]CVE-2020-5953

HistoryFeb 03, 2022 - 1:15 a.m.

CVE-2020-5953

2022-02-0301:15:07

[email protected]

web.nvd.nist.gov

vulnerability

system management interrupt

swsmi handler

insydeh2o

uefi firmware

code execution

smm

privilege escalation

6.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:C/I:C/A:C

7.5 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

7.8 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

20.6%

JSON

A vulnerability exists in System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware code located in SWSMI handler that dereferences gRT (EFI_RUNTIME_SERVICES) pointer to call a GetVariable service, which is located outside of SMRAM. This can result in code execution in SMM (escalating privilege from ring 0 to ring -2).

Affected configurations

NVD

Node

insydeinsydeh2oMatch5.12.09.0074

insydeinsydeh2oMatch5.23.04.0045

insydeinsydeh2oMatch5.23.45.0023

insydeinsydeh2oMatch5.33.15.0034

insydeinsydeh2oMatch5.34.03.0029

insydeinsydeh2oMatch5.42.03.0010

Node

siemensruggedcom_ape1808Match-

AND

siemensruggedcom_ape1808_firmwareMatch-

Node

siemenssimatic_field_pg_m6Match-

AND

siemenssimatic_field_pg_m6_firmwareMatch-

Node

siemenssimatic_ipc127eMatch-

AND

siemenssimatic_ipc127e_firmwareMatch-

Node

siemenssimatic_ipc227gMatch-

AND

siemenssimatic_ipc227g_firmwareMatch-

Node

siemenssimatic_ipc277gMatch-

AND

siemenssimatic_ipc277g_firmwareMatch-

Node

siemenssimatic_itp1000Match-

AND

siemenssimatic_itp1000_firmwareMatch-

Node

siemenssimatic_ipc477e_proMatch-

AND

siemenssimatic_ipc477e_pro_firmwareMatch-

Node

siemenssimatic_ipc627eMatch-

AND

siemenssimatic_ipc627e_firmwareMatch-

Node

siemenssimatic_ipc647e_firmwareMatch-

AND

siemenssimatic_ipc647eMatch-

Node

siemenssimatic_ipc677e_firmwareMatch-

AND

siemenssimatic_ipc677eMatch-

Node

siemenssimatic_ipc847e_firmwareMatch-

AND

siemenssimatic_ipc847eMatch-

Node

siemenssimatic_ipc327g_firmwareMatch-

AND

siemenssimatic_ipc327gMatch-

Node

siemenssimatic_ipc377g_firmwareMatch-

AND

siemenssimatic_ipc377gMatch-

Node

siemenssimatic_ipc427e_firmwareMatch-

AND

siemenssimatic_ipc427eMatch-

Node

siemenssimatic_ipc477e_firmwareMatch-

AND

siemenssimatic_ipc477eMatch-

Node

siemenssimatic_field_pg_m5_firmwareMatch-

AND

siemenssimatic_field_pg_m5Match-

CPENameOperatorVersion
insyde:insydeh2oinsyde insydeh2oeq5.12.09.0074
insyde:insydeh2oinsyde insydeh2oeq5.23.04.0045
insyde:insydeh2oinsyde insydeh2oeq5.23.45.0023
insyde:insydeh2oinsyde insydeh2oeq5.33.15.0034
insyde:insydeh2oinsyde insydeh2oeq5.34.03.0029
insyde:insydeh2oinsyde insydeh2oeq5.42.03.0010

CPE	Name	Operator	Version
insyde:insydeh2o	insyde insydeh2o	eq	5.12.09.0074
insyde:insydeh2o	insyde insydeh2o	eq	5.23.04.0045
insyde:insydeh2o	insyde insydeh2o	eq	5.23.45.0023
insyde:insydeh2o	insyde insydeh2o	eq	5.33.15.0034
insyde:insydeh2o	insyde insydeh2o	eq	5.34.03.0029
insyde:insydeh2o	insyde insydeh2o	eq	5.42.03.0010

References

cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf

security.netapp.com/advisory/ntap-20220222-0005/

www.insyde.com/products

www.insyde.com/security-pledge

6.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:C/I:C/A:C

7.5 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

7.8 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

20.6%

JSON

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