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 Details
- CVSS 3.1 Base Score: 4.7
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | alpine-linux-upgrade-mbedtlsalpine-linux-upgrade-mbedtls2alpine-linux-upgrade-mbedtls3 | Aug 22, 2024 | Apr 15, 2020 | |
| Arch Linux | arch-linux-upgrade-latest | Jul 11, 2025 | Apr 15, 2020 | |
| Debian | debian-upgrade-mbedtls | Dec 28, 2022 | Apr 15, 2020 | |
| Freebsd | freebsd-upgrade-package-mbedtls | Apr 16, 2020 | Apr 15, 2020 | |
| Suse | — | suse-upgrade-libmbedcrypto3suse-upgrade-libmbedcrypto3-32bitsuse-upgrade-libmbedcrypto3-64bitsuse-upgrade-libmbedtls12suse-upgrade-libmbedtls12-32bitsuse-upgrade-libmbedtls12-64bitsuse-upgrade-libmbedx509-0suse-upgrade-libmbedx509-0-32bitsuse-upgrade-libmbedx509-0-64bitsuse-upgrade-mbedtls-devel | Mar 6, 2021 | Apr 15, 2020 |
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