Home→Vulnerabilities→CVE-2020-20949
Disclosed

CVE-2020-20949

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.

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Exploitation Probability (EPSS)

Low Priority
0.54%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

2 events
Jan 20, 2021
Vulnerability Disclosed
Published to component-level vulnerability database.
Jul 21, 2021
Last Updated
Record updated with new analysis or tags.

Threat Actor Attribution

PREMIUM INTEL
Associated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

Affected Products

22 Total
st/stm32cubef0-
st/stm32cubef1-
st/stm32cubef2-
st/stm32cubef3-
st/stm32cubef4-

References

http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfEthz
Technical DescriptionThird Party Advisory
http://st.comSt
Product
http://x-cube-cryptolib.comX-cube-cryptolib
Broken Link
https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bbMedium
Technical DescriptionThird Party Advisory

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Vulnerability Details

CVSS Base Score
5.9/ 10
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Published Date
Jan 20, 2021
Last Modified
Jul 21, 2021
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