# CVE-2018-0495: Information disclosure in Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 > Attackers with local or co-tenant access can recover ECDSA private keys via memory-cache side-channel attacks in Libgcrypt. - **Severity:** Medium 4.7 (`CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 13 Jun 2018 - **Updated:** 14 Oct 2026 - **Also known as:** ALPINE-CVE-2018-0495, DEBIAN-CVE-2018-0495, DLA-1405-1, DSA-4231-1, GHSA-q2v2-pgm4-m8c8, MGASA-2018-0301, MGASA-2018-0306, MGASA-2019-0038, SUSE-SU-2018:1993-1, SUSE-SU-2018:2089-1, SUSE-SU-2018:2452-2, UBUNTU-CVE-2018-0495, USN-3689-1 ## What is CVE-2018-0495? CVE-2018-0495 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 13 Jun 2018. It can only be exploited from the same machine or local network, with no action from the victim. ### Official 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. Weakness: CWE-203 (Observable Discrepancy) ## Which versions are affected by CVE-2018-0495? It affects 8 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `libgcrypt` | SUSE:Linux Enterprise Desktop 12 SP3 | All versions | 1.6.1-16.55.1 | | `libgcrypt` | SUSE:Linux Enterprise Desktop 12 SP3 | All versions | 1.6.1-16.62.1 | | `libgcrypt` | SUSE:Linux Enterprise Desktop 12 SP4 | All versions | 1.6.1-16.62.1 | | `libgcrypt` | SUSE:Linux Enterprise Module for Basesystem 15 | All versions | 1.8.2-6.3.1 | | `libgcrypt` | SUSE:Linux Enterprise Server 12 SP3 | All versions | 1.6.1-16.55.1 | | `libgcrypt` | SUSE:Linux Enterprise Server 12 SP3 | All versions | 1.6.1-16.62.1 | | `libgcrypt` | SUSE:Linux Enterprise Server 12 SP4 | All versions | 1.6.1-16.62.1 | | `libgcrypt` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 1.6.1-16.55.1 | | `libgcrypt` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 1.6.1-16.62.1 | | `libgcrypt` | SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | All versions | 1.6.1-16.62.1 | | `libgcrypt` | SUSE:Linux Enterprise Software Development Kit 12 SP3 | All versions | 1.6.1-16.55.1 | | `libgcrypt` | SUSE:Linux Enterprise Software Development Kit 12 SP3 | All versions | 1.6.1-16.62.1 | | `libgcrypt` | SUSE:Linux Enterprise Software Development Kit 12 SP4 | All versions | 1.6.1-16.62.1 | Products: Canonical Ubuntu Linux, Debian Debian Linux, Gnupg Libgcrypt, Oracle Traffic Director, Redhat Ansible Tower, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Workstation. ## How do I fix CVE-2018-0495? Upgrade to a fixed version. ## Is CVE-2018-0495 being exploited? There is no known exploitation of CVE-2018-0495 in the wild and no public exploit code. ## Other vulnerabilities in Canonical Ubuntu Linux - [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild) - [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild) - [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2018-0495 and fix it if it is affected. What it is: CVE-2018-0495 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 13 Jun 2018. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2018-0495 in the wild and no public exploit code. Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2018-0495/ (Markdown: https://insights.sbomify.com/CVE-2018-0495/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0495 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0495 - OSV: https://osv.dev/vulnerability/CVE-2018-0495 --- From sbomify Insights: https://insights.sbomify.com/CVE-2018-0495/ Summaries are generated and may contain mistakes; the official description above is the record.