CVE-2016-7795 Denial of service in n/a
Medium 5.5
Published
Updated
Check this codebase for CVE-2016-7795 and fix it if it is affected.
What it is: CVE-2016-7795 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 13 Oct 2016. 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-2016-7795 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-2016-7795/ (Markdown: https://insights.sbomify.com/CVE-2016-7795/index.md)
Local attackers can cause a denial of service by sending a zero-length message to the systemd notify socket, triggering an assertion failure and hanging PID 1.
- 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-2016-7795?
CVE-2016-7795 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 13 Oct 2016. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The manager_invoke_notify_message function in systemd 231 and earlier allows local users to cause a denial of service (assertion failure and PID 1 hang) via a zero-length message received over a notify socket.
Weakness: CWE-20
Which versions are affected by CVE-2016-7795?
It affects 2 products.
Linux distribution packages (40)
libgudev1 Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
libgudev1-devel Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
systemd Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
systemd-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
systemd-devel Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
systemd-journal-gateway Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
systemd-libs Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
systemd-networkd Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
systemd-python Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
systemd-resolved Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
systemd-sysv Red Hat:enterprise_linux:7::client | All versions | 0:219-30.el7_3.3 |
libgudev1 Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
libgudev1-devel Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
systemd Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
systemd-debuginfo Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
systemd-devel Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
systemd-journal-gateway Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
systemd-libs Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
systemd-networkd Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
systemd-python Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
systemd-resolved Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
systemd-sysv Red Hat:enterprise_linux:7::computenode | All versions | 0:219-30.el7_3.3 |
libgudev1 Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
libgudev1-devel Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
systemd Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
systemd-debuginfo Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
systemd-devel Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
systemd-journal-gateway Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
systemd-libs Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
systemd-networkd Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
systemd-python Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
systemd-resolved Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
systemd-sysv Red Hat:enterprise_linux:7::server | All versions | 0:219-30.el7_3.3 |
libgudev1 Red Hat:enterprise_linux:7::workstation | All versions | 0:219-30.el7_3.3 |
libgudev1-devel Red Hat:enterprise_linux:7::workstation | All versions | 0:219-30.el7_3.3 |
systemd Red Hat:enterprise_linux:7::workstation | All versions | 0:219-30.el7_3.3 |
systemd-debuginfo Red Hat:enterprise_linux:7::workstation | All versions | 0:219-30.el7_3.3 |
systemd-devel Red Hat:enterprise_linux:7::workstation | All versions | 0:219-30.el7_3.3 |
systemd-journal-gateway Red Hat:enterprise_linux:7::workstation | All versions | 0:219-30.el7_3.3 |
systemd-libs Red Hat:enterprise_linux:7::workstation | All versions | 0:219-30.el7_3.3 |
Products include Canonical Ubuntu Linux, Systemd Project Systemd.
How do I fix CVE-2016-7795?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2016-7795 being exploited?
There is no known exploitation of CVE-2016-7795 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2016-7795, GHSA-r5cr-2q2m-4c59, MGASA-2016-0380, RHSA-2016:2610, RHSA-2016:2694, UBUNTU-CVE-2016-7795.