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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-0495 from the MITRE CVE dictionary dictionary and NIST NVD.
| CVSS3 Base Score | 5.1 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| Attack Vector | Local |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | None |
| Availability Impact | None |
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 7 (openssl) | RHSA-2018:3221 | 2018-10-30 |
| Platform | Package | State |
|---|---|---|
| Red Hat Virtualization 4 | bouncycastle | Not affected |
| Red Hat Subscription Asset Manager 1 | bouncycastle | Not affected |
| Red Hat Satellite 6 | bouncycastle | Not affected |
| Red Hat JBoss Web Server 3 | openssl | Affected |
| Red Hat JBoss EWS 2 | openssl | Will not fix |
| Red Hat JBoss EAP 7 | bouncycastle | Not affected |
| Red Hat JBoss EAP 6 | openssl | Will not fix |
| Red Hat JBoss EAP 5 | openssl | Under investigation |
| Red Hat JBoss Core Services 1 | openssl | Affected |
| Red Hat Enterprise Linux 7 | libgcrypt | Not affected |
| Red Hat Enterprise Linux 7 | openssl098e | Will not fix |
| Red Hat Enterprise Linux 7 | nss | Affected |
| Red Hat Enterprise Linux 7 | OVMF | Under investigation |
| Red Hat Enterprise Linux 6 | libgcrypt | Not affected |
| Red Hat Enterprise Linux 6 | openssl | Will not fix |
| Red Hat Enterprise Linux 6 | nss | Affected |
| Red Hat Enterprise Linux 6 | openssl098e | Will not fix |
| Red Hat Enterprise Linux 5 | openssl097a | Will not fix |
| Red Hat Enterprise Linux 5 | openssl | Will not fix |
| Red Hat Enterprise Linux 5 | libgcrypt | Not affected |
| Red Hat Enterprise Linux 5 | nss | Will not fix |
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