PT-2021-10560 · Stmicroelectronics · Stm32Cube

Published 2021-01-20 · Updated 2021-07-21 · CVE-2020-20949

Positive Technologies (AI Summary)

CVSS v3.1

5.9

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: STM32 cryptographic firmware library software expansion for STM32Cube (UM1924) (affected versions not specified)

Description: The issue concerns Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA, which can be exploited using Bleichenbacher's oracle attack. This allows an attacker to decrypt an encrypted ciphertext by making successive queries to the server using the vulnerable library, resulting in remote information disclosure.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use of a Broken Cryptographic Algorithm

Weakness Enumeration

CWE-327

Related Identifiers

CVE-2020-20949

Affected Products

Stm32Cube

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2020-20949 · Security Note
• https://osv.dev/vulnerability/CVE-2020-20949 · Vendor Advisory
• http://st.com · Note
• https://t.me/cibsecurity/22419 · Telegram Post
• http://x-cube-cryptolib.com · Note
• https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bb · Note
• https://st.com/en/embedded-software/x-cube-cryptolib.html · Note
• http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdf · Note