CVE-2020-20949
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.
Does this matter?
Lower severity and a low EPSS score (0.93%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.93% probability · 59th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-327
- Affected
- st/stm32cubef0 · st/stm32cubef1 · st/stm32cubef2 · st/stm32cubef3 · st/stm32cubef4 · st/stm32cubef7 · st/stm32cubeg0 · st/stm32cubeg4 · st/stm32cubeh7 · st/stm32cubeide · st/stm32cubel0 · st/stm32cubel1 · st/stm32cubel4 · st/stm32cubel4\+ · st/stm32cubel5 · st/stm32cubemonitor · st/stm32cubemp1 · st/stm32cubemx · st/stm32cubeprogrammer · st/stm32cubewb · +2 more
- Source
- cve@mitre.org
References
- http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfTechnical Description, Third Party Advisory
- https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bbTechnical Description, Third Party Advisory
- https://www.st.com/en/embedded-software/x-cube-cryptolib.htmlThird Party Advisory
- http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfTechnical Description, Third Party Advisory
- https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bbTechnical Description, Third Party Advisory
- https://www.st.com/en/embedded-software/x-cube-cryptolib.htmlThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.