CVE-2021-33910 Denial of service in n/a
Medium 5.5
Published
Updated
Check this codebase for CVE-2021-33910 and fix it if it is affected.
What it is: CVE-2021-33910 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 20 Jul 2021. 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-2021-33910 in the wild and no public exploit code.
Affected product: Debian Debian 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-2021-33910/ (Markdown: https://insights.sbomify.com/CVE-2021-33910/index.md)
A local attacker can crash the operating system by triggering excessive memory allocation in systemd's unit name parser.
- 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-2021-33910?
CVE-2021-33910 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 20 Jul 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.
Weakness: CWE-770
Which versions are affected by CVE-2021-33910?
It affects 5 products.
Linux distribution packages (40)
systemd Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-container Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-container-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-devel Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-journal-remote Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-journal-remote-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-libs Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-libs-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-pam Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-pam-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-tests Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-tests-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-udev Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd-udev-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:239-45.el8_4.2 |
systemd Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-container Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-container-debuginfo Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-debuginfo Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-debugsource Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-devel Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-journal-remote Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-journal-remote-debuginfo Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-libs Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-libs-debuginfo Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-pam Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-pam-debuginfo Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-tests Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-tests-debuginfo Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-udev Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd-udev-debuginfo Red Hat:rhel_eus:8.1::baseos | All versions | 0:239-18.el8_1.8 |
systemd Red Hat:rhel_eus:8.2::baseos | All versions | 0:239-31.el8_2.4 |
systemd-container Red Hat:rhel_eus:8.2::baseos | All versions | 0:239-31.el8_2.4 |
systemd-container-debuginfo Red Hat:rhel_eus:8.2::baseos | All versions | 0:239-31.el8_2.4 |
systemd-debuginfo Red Hat:rhel_eus:8.2::baseos | All versions | 0:239-31.el8_2.4 |
systemd-debugsource Red Hat:rhel_eus:8.2::baseos | All versions | 0:239-31.el8_2.4 |
systemd-devel Red Hat:rhel_eus:8.2::baseos | All versions | 0:239-31.el8_2.4 |
systemd-journal-remote Red Hat:rhel_eus:8.2::baseos | All versions | 0:239-31.el8_2.4 |
systemd-journal-remote-debuginfo Red Hat:rhel_eus:8.2::baseos | All versions | 0:239-31.el8_2.4 |
Products include Debian Debian Linux, Fedoraproject Fedora, Netapp Hci Management Node, Netapp Solidfire, Systemd Project Systemd.
How do I fix CVE-2021-33910?
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-2021-33910 being exploited?
There is no known exploitation of CVE-2021-33910 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as CLSA-2021-1635459232, DEBIAN-CVE-2021-33910, DLA-2715-1, DSA-4942-1, GHSA-5337-wcgc-wcvp, OESA-2021-1271 and 17 more.