5.9
MEDIUM
CVE-2020-20949
STM32Cube RSA Padding Vulnerability
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.

INFO

Published Date :

Jan. 20, 2021, 4:15 p.m.

Last Modified :

Nov. 21, 2024, 5:12 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

2.2
Affected Products

The following products are affected by CVE-2020-20949 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 St stm32cubef0
2 St stm32cubef1
3 St stm32cubef2
4 St stm32cubef3
5 St stm32cubef4
6 St stm32cubef7
7 St stm32cubeg0
8 St stm32cubeg4
9 St stm32cubeh7
10 St stm32cubeide
11 St stm32cubel0
12 St stm32cubel1
13 St stm32cubel4
14 St stm32cubel4\+
15 St stm32cubel5
16 St stm32cubemonitor
17 St stm32cubemp1
18 St stm32cubemx
19 St stm32cubeprogrammer
20 St stm32cubewb
21 St stm32cubewl
1 Ietf public_key_cryptography_standards_\#1
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2020-20949.

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

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-20949 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-20949 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdf
    Added Reference http://st.com
    Added Reference http://x-cube-cryptolib.com
    Added Reference https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bb
    Added Reference https://www.st.com/en/embedded-software/x-cube-cryptolib.html
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CWE Remap by [email protected]

    Jul. 21, 2021

    Action Type Old Value New Value
    Changed CWE CWE-326 CWE-327
  • Initial Analysis by [email protected]

    Feb. 02, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:N/A:N)
    Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
    Changed Reference Type http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdf No Types Assigned http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdf Technical Description, Third Party Advisory
    Changed Reference Type http://st.com No Types Assigned http://st.com Product
    Changed Reference Type http://x-cube-cryptolib.com No Types Assigned http://x-cube-cryptolib.com Broken Link
    Changed Reference Type https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bb No Types Assigned https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bb Technical Description, Third Party Advisory
    Changed Reference Type https://www.st.com/en/embedded-software/x-cube-cryptolib.html No Types Assigned https://www.st.com/en/embedded-software/x-cube-cryptolib.html Third Party Advisory
    Added CWE NIST CWE-326
    Added CPE Configuration OR *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:-:*:*:*:*:*:*:* *cpe:2.3:a:st:stm32cubemonitor:-:*:*:*:*:*:*:* *cpe:2.3:a:st:stm32cubemp1:-:*:*:*:*:*:*:* *cpe:2.3:a:st:stm32cubemx:-:*:*:*:*:*:*:* *cpe:2.3:a:st:stm32cubeprogrammer:-:*:*:*:*:*:*:* *cpe:2.3:a:st:stm32cubewb:-:*:*:*:*:*:*:* *cpe:2.3:a:st:stm32cubewl:-:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:ietf:public_key_cryptography_standards_\#1:1.5:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-20949 is associated with the following CWEs:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.12 }} -0.04%

score

0.46363

percentile

CVSS31 - Vulnerability Scoring System
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