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FreeBSD: VID-BF1F47C4-7F1B-11EA-BF94-001CC0382B2F (CVE-2020-10932): Mbed TLS -- Side channel attack on ECDSA

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FreeBSD: VID-BF1F47C4-7F1B-11EA-BF94-001CC0382B2F (CVE-2020-10932): Mbed TLS -- Side channel attack on ECDSA

Severity
2
CVSS
(AV:L/AC:M/Au:N/C:P/I:N/A:N)
Published
04/14/2020
Created
04/18/2020
Added
04/16/2020
Modified
03/06/2023

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.

Solution(s)

  • freebsd-upgrade-package-mbedtls

References

  • CVE-2020-10932

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