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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| 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 | - |
Related Weaknesses (CWE)
References
- http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfTechnical DescriptionThird Party Advisory
- http://st.comProduct
- http://x-cube-cryptolib.comBroken Link
- https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-yTechnical DescriptionThird 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 DescriptionThird Party Advisory
- http://st.comProduct
- http://x-cube-cryptolib.comBroken Link
- https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-yTechnical DescriptionThird Party Advisory
- https://www.st.com/en/embedded-software/x-cube-cryptolib.htmlThird Party Advisory
FAQ
What is CVE-2020-20949?
CVE-2020-20949 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 oracl...
How severe is CVE-2020-20949?
CVE-2020-20949 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-20949?
Check the references section above for vendor advisories and patch information. Affected products include: St Stm32Cubef0, St Stm32Cubef1, St Stm32Cubef2, St Stm32Cubef3, St Stm32Cubef4.