# CVE-2018-0495: libgcrypt20: 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...

CVE-2018-0495 is fixed in 7 products on 1 platform, first by libgcrypt20 1.8.1-4ubuntu1.1, released June 12, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-0495
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0087
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 12, 2018

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libgcrypt20 Ubuntu 18.04.6 LTS (bionic) | 1.8.1-4ubuntu1.1 | [libgcrypt20 1.8.1-4ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libgcrypt20-1.8.1-4ubuntu1.1.md) | Jun 12, 2018 |
| Linux | libnss3 Ubuntu 18.04.6 LTS (bionic) | 2:3.35-2ubuntu2.1 | [libnss3 2:3.35-2ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss3-2-3.35-2ubuntu2.1.md) | Dec 11, 2018 |
| Linux | libnss3-tools Ubuntu 18.04.6 LTS (bionic) | 2:3.35-2ubuntu2.1 | [libnss3-tools 2:3.35-2ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss3-tools-2-3.35-2ubuntu2.1.md) | Dec 11, 2018 |
| Linux | libssl1.0.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.1 | [libssl1.0.0 1.0.2n-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.0.0-1.0.2n-1ubuntu5.1.md) | Jun 12, 2018 |
| Linux | libssl1.1 Ubuntu 18.04.6 LTS (bionic) | 1.1.0g-2ubuntu4.1 | [libssl1.1 1.1.0g-2ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.1-1.1.0g-2ubuntu4.1.md) | Jun 12, 2018 |
| Linux | openssl Ubuntu 18.04.6 LTS (bionic) | 1.1.0g-2ubuntu4.1 | [openssl 1.1.0g-2ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl-1.1.0g-2ubuntu4.1.md) | Jun 12, 2018 |
| Linux | openssl1.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.1 | [openssl1.0 1.0.2n-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl1.0-1.0.2n-1ubuntu5.1.md) | Jun 12, 2018 |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo