CVE-2020-10932

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.

• CWE-203
• CWE-327

• https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCWN5HIF4CJ2LZTOMEBJ7Q4IMMV7ZU2V/Mailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNOS2IIBH5WNJXZUV546PY7666DE7Y3L/Mailing List, Third 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-2020-04Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCWN5HIF4CJ2LZTOMEBJ7Q4IMMV7ZU2V/Mailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNOS2IIBH5WNJXZUV546PY7666DE7Y3L/Mailing List, Third 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-2020-04Vendor Advisory

Published

Apr 15, 2020

Last Modified

Jun 17, 2026

Status

Modified

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