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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2020-04-15T00:00:00

Updated: 2024-08-04T11:21:12.970Z

Reserved: 2020-03-24T00:00:00

Link: CVE-2020-10932

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2020-04-15T14:15:20.123

Modified: 2024-11-21T04:56:23.837

Link: CVE-2020-10932

cve-icon Redhat

No data.