Medium · published June 14, 2018
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.
| Product | Versions | Fixed in |
|---|---|---|
| gnupg/libgcrypt | < 1.7.10 | 1.7.10 |
| gnupg/libgcrypt | ≥ 1.8.0, < 1.8.3 | 1.8.3 |
| canonical/ubuntu_linux | all versions | — |
| canonical/ubuntu_linux | all versions | — |
| canonical/ubuntu_linux | all versions | — |
| canonical/ubuntu_linux | all versions | — |
| canonical/ubuntu_linux | all versions | — |
| canonical/ubuntu_linux | all versions | — |
| debian/debian_linux | all versions | — |
| debian/debian_linux | all versions | — |
| redhat/ansible_tower | all versions | — |
| redhat/enterprise_linux_desktop | all versions | — |
| redhat/enterprise_linux_server | all versions | — |
| redhat/enterprise_linux_workstation | all versions | — |
| oracle/traffic_director | all versions | — |