{"schemaVersion":3,"id":"CVE-2020-10932","aliases":["ALPINE-CVE-2020-10932","MGASA-2020-0265","openSUSE-SU-2021:0397-1","UBUNTU-CVE-2020-10932","DEBIAN-CVE-2020-10932","openSUSE-SU-2021:0384-1"],"status":"published","duplicateOf":null,"title":null,"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. 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