CVE-2020-20949

CVSS V2 Medium 4.3 CVSS V3 Medium 5.9
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.
Overview
  • CVE ID
  • CVE-2020-20949
  • Assigner
  • cve@mitre.org
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-01-20T16:15:14
  • Last Modified Date
  • 2021-07-21T11:39:23
Weakness Enumerations
CWE URL
CWE-327 http://cwe.mitre.org/data/definitions/327.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:a:st:stm32cubef0:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubef1:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubef2:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubef3:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubef4:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubef7:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubeg0:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubeg4:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubeh7:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubeide:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubel0:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubel1:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubel4:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubel4\+:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubel5:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubemonitor:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubemp1:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubemx:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubeprogrammer:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubewb:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:st:stm32cubewl:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:ietf:public_key_cryptography_standards_\#1:1.5:*:*:*:*:*:*:* 1 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:M/Au:N/C:P/I:N/A:N
  • Access Vector
  • NETWORK
  • Access Compatibility
  • MEDIUM
  • Authentication
  • NONE
  • Confidentiality Impact
  • PARTIAL
  • Integrity Impact
  • NONE
  • Availability Impact
  • NONE
  • Base Score
  • 4.3
  • Severity
  • MEDIUM
  • Exploitability Score
  • 8.6
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • HIGH
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • HIGH
  • Availability Impact
  • NONE
  • Base Score
  • 5.9
  • Base Severity
  • MEDIUM
  • Exploitability Score
  • 2.2
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
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
http://st.com Product
http://x-cube-cryptolib.com Broken Link
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
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2020-20949
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-20949
History
Created Old Value New Value Data Type Notes
2022-05-10 07:03:15 Added to TrackCVE
2022-12-05 20:34:14 2021-01-20T16:15Z 2021-01-20T16:15:14 CVE Published Date updated
2022-12-05 20:34:14 2021-07-21T11:39:23 CVE Modified Date updated
2022-12-05 20:34:14 Analyzed Vulnerability Status updated