CVE-2020-20949 Information

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.

CVSS Vector

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

Reference

https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bb http://st.com http://x-cube-cryptolib.com https://www.st.com/en/embedded-software/x-cube-cryptolib.html http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdf

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.9