Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2020-20949

Severity CVSS v4.0:
Pending analysis
Type:
CWE-327 Use of a Broken or Risky Cryptographic Algorithm
Publication date:
20/01/2021
Last modified:
21/07/2021

Description

Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA in STM32 cryptographic firmware library software expansion for STM32Cube (UM1924). The vulnerability can allow one to use Bleichenbacher's oracle attack to decrypt an encrypted ciphertext by making successive queries to the server using the vulnerable library, resulting in remote information disclosure.

Impact

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

Base Score: 5.90 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

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

Base Score 3.x
5.90
Severity 3.x
MEDIUM
Vector 2.0
AV:N/AC:M/Au:N/C:P/I:N/A:N CVSS v2.0 Severity and Metrics:

Base Score: 4.30 MEDIUM
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

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

Base Score 2.0
4.30
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:st:stm32cubef0:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubef1:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubef2:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubef3:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubef4:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubef7:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubeg0:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubeg4:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubeh7:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubeide:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubel0:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubel1:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubel4:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubel4\+:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubel5:-:*:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools