Saint ROHNP

Technical record

Disclosed on

June 13 2018

CVE

CVE-2018-0495CVE-2018-12436CVE-2018-12440CVE-2018-12439CVE-2018-12438CVE-2018-12437CVE-2018-12435CVE-2018-12434CVE-2018-12433

Product

Libgcrypt before 1.7.10 and 1.8.x before 1.8.3

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.

Sources: nccgroup.trust · web.archive.org · fox-it.com · ches.iacr.org · wolfssl.com