Vulnerability Description
An issue was discovered in Arm Mbed TLS before 2.16.6 and 2.7.x before 2.7.15. An attacker that can get precise enough side-channel measurements can recover the long-term ECDSA private key by (1) reconstructing the projective coordinate of the result of scalar multiplication by exploiting side channels in the conversion to affine coordinates; (2) using an attack described by Naccache, Smart, and Stern in 2003 to recover a few bits of the ephemeral scalar from those projective coordinates via several measurements; and (3) using a lattice attack to get from there to the long-term ECDSA private key used for the signatures. Typically an attacker would have sufficient access when attacking an SGX enclave and controlling the untrusted OS.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Arm | Mbed Tls | >= 2.7.0, < 2.7.15 |
| Fedoraproject | Fedora | 31 |
| Debian | Debian Linux | 10.0 |
Related Weaknesses (CWE)
References
- https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- https://tls.mbed.org/tech-updates/releases/mbedtls-2.16.6-and-2.7.15-releasedRelease Notes
- https://tls.mbed.org/tech-updates/security-advisoriesVendor Advisory
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- https://tls.mbed.org/tech-updates/releases/mbedtls-2.16.6-and-2.7.15-releasedRelease Notes
- https://tls.mbed.org/tech-updates/security-advisoriesVendor Advisory
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-Vendor Advisory
FAQ
What is CVE-2020-10932?
CVE-2020-10932 is a vulnerability with a CVSS score of 4.7 (MEDIUM). An issue was discovered in Arm Mbed TLS before 2.16.6 and 2.7.x before 2.7.15. An attacker that can get precise enough side-channel measurements can recover the long-term ECDSA private key by (1) reco...
How severe is CVE-2020-10932?
CVE-2020-10932 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-10932?
Check the references section above for vendor advisories and patch information. Affected products include: Arm Mbed Tls, Fedoraproject Fedora, Debian Debian Linux.