CVE-2016-7056 Weak cryptography in openssl
Medium 5.5
Published
Updated
Check this codebase for CVE-2016-7056 and fix it if it is affected.
What it is: CVE-2016-7056 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 10 Sep 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-2016-7056 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-2016-7056/ (Markdown: https://insights.sbomify.com/CVE-2016-7056/index.md)
A local attacker can exploit a timing side-channel in OpenSSL to recover ECDSA P-256 private keys, compromising cryptographic security.
- 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
What is CVE-2016-7056?
CVE-2016-7056 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 10 Sep 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A timing attack flaw was found in OpenSSL 1.0.1u and before that could allow a malicious user with local access to recover ECDSA P-256 private keys.
Which versions are affected by CVE-2016-7056?
It affects 4 products.
Linux distribution packages (24)
openssl Red Hat:enterprise_linux:7::client | All versions | 1:1.0.2k-8.el7 |
openssl-debuginfo Red Hat:enterprise_linux:7::client | All versions | 1:1.0.2k-8.el7 |
openssl-devel Red Hat:enterprise_linux:7::client | All versions | 1:1.0.2k-8.el7 |
openssl-libs Red Hat:enterprise_linux:7::client | All versions | 1:1.0.2k-8.el7 |
openssl-perl Red Hat:enterprise_linux:7::client | All versions | 1:1.0.2k-8.el7 |
openssl-static Red Hat:enterprise_linux:7::client | All versions | 1:1.0.2k-8.el7 |
openssl Red Hat:enterprise_linux:7::computenode | All versions | 1:1.0.2k-8.el7 |
openssl-debuginfo Red Hat:enterprise_linux:7::computenode | All versions | 1:1.0.2k-8.el7 |
openssl-devel Red Hat:enterprise_linux:7::computenode | All versions | 1:1.0.2k-8.el7 |
openssl-libs Red Hat:enterprise_linux:7::computenode | All versions | 1:1.0.2k-8.el7 |
openssl-perl Red Hat:enterprise_linux:7::computenode | All versions | 1:1.0.2k-8.el7 |
openssl-static Red Hat:enterprise_linux:7::computenode | All versions | 1:1.0.2k-8.el7 |
openssl Red Hat:enterprise_linux:7::server | All versions | 1:1.0.2k-8.el7 |
openssl-debuginfo Red Hat:enterprise_linux:7::server | All versions | 1:1.0.2k-8.el7 |
openssl-devel Red Hat:enterprise_linux:7::server | All versions | 1:1.0.2k-8.el7 |
openssl-libs Red Hat:enterprise_linux:7::server | All versions | 1:1.0.2k-8.el7 |
openssl-perl Red Hat:enterprise_linux:7::server | All versions | 1:1.0.2k-8.el7 |
openssl-static Red Hat:enterprise_linux:7::server | All versions | 1:1.0.2k-8.el7 |
openssl Red Hat:enterprise_linux:7::workstation | All versions | 1:1.0.2k-8.el7 |
openssl-debuginfo Red Hat:enterprise_linux:7::workstation | All versions | 1:1.0.2k-8.el7 |
openssl-devel Red Hat:enterprise_linux:7::workstation | All versions | 1:1.0.2k-8.el7 |
openssl-libs Red Hat:enterprise_linux:7::workstation | All versions | 1:1.0.2k-8.el7 |
openssl-perl Red Hat:enterprise_linux:7::workstation | All versions | 1:1.0.2k-8.el7 |
openssl-static Red Hat:enterprise_linux:7::workstation | All versions | 1:1.0.2k-8.el7 |
Products include Canonical Ubuntu Linux, Debian Debian Linux, Openssl Openssl, Redhat Enterprise Linux.
How do I fix CVE-2016-7056?
Upgrade to a fixed version.
Is CVE-2016-7056 being exploited?
There is no known exploitation of CVE-2016-7056 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2016-7056, GHSA-9f4v-cw9w-g4cw, RHBA-2017:1929, UBUNTU-CVE-2016-7056.