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

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CVE-2020-36478

Severity CVSS v4.0:
Pending analysis
Type:
CWE-295 Improper Certificate Validation
Publication date:
23/08/2021
Last modified:
11/01/2023

Description

An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS). A NULL algorithm parameters entry looks identical to an array of REAL (size zero) and thus the certificate is considered valid. However, if the parameters do not match in any way, then the certificate should be considered invalid.

Impact

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

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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

Base Score 3.x
7.50
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:L/Au:N/C:N/I:P/A:N CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N

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

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* 2.7.18 (excluding)
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* 2.8.0 (including) 2.16.9 (excluding)
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* 2.17.0 (including) 2.25.0 (excluding)
cpe:2.3:o:siemens:logo\!_cmr2020_firmware:*:*:*:*:*:*:*:* 2.2 (excluding)
cpe:2.3:h:siemens:logo\!_cmr2020:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:logo\!_cmr2040_firmware:*:*:*:*:*:*:*:* 2.2 (excluding)
cpe:2.3:h:siemens:logo\!_cmr2040:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_rtu3031c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_rtu3031c:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_rtu3041c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_rtu3041c:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_rtu3030c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_rtu3030c:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_rtu3000c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_rtu3000c:-:*:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools