Memory-cache side-channel vulnerability in Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 during ECDSA signature signing process (ROHNP)

CVE-2018-0495 · LOW Severity

AV:L/AC:M/AU:N/C:P/I:N/A:N

Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

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