CVE-2021-3905 Denial of service in openvswitch (ovs)
High 7.5
Published
Updated
Check this codebase for CVE-2021-3905 and fix it if it is affected.
What it is: CVE-2021-3905 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 23 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-3905 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-2021-3905/ (Markdown: https://insights.sbomify.com/CVE-2021-3905/index.md)
An attacker can exhaust system memory by sending fragmented IP packets, causing a denial of service in Open vSwitch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-3905?
CVE-2021-3905 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 23 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially exhaust available memory by keeping sending packet fragments.
Weakness: CWE-401
Which versions are affected by CVE-2021-3905?
It affects 4 products.
Linux distribution packages (27)
network-scripts-openvswitch2.13 Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.13.0-139.el8fdp |
network-scripts-openvswitch2.15 Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.15.0-55.el8fdp |
network-scripts-openvswitch2.16 Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.16.0-86.el8fdp |
openvswitch2.13 Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.13.0-139.el8fdp |
openvswitch2.13-debuginfo Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.13.0-139.el8fdp |
openvswitch2.13-debugsource Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.13.0-139.el8fdp |
openvswitch2.13-devel Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.13.0-139.el8fdp |
openvswitch2.13-ipsec Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.13.0-139.el8fdp |
openvswitch2.13-test Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.13.0-139.el8fdp |
openvswitch2.15 Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.15.0-55.el8fdp |
openvswitch2.15-debuginfo Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.15.0-55.el8fdp |
openvswitch2.15-debugsource Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.15.0-55.el8fdp |
openvswitch2.15-devel Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.15.0-55.el8fdp |
openvswitch2.15-ipsec Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.15.0-55.el8fdp |
openvswitch2.15-test Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.15.0-55.el8fdp |
openvswitch2.16 Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.16.0-86.el8fdp |
openvswitch2.16-debuginfo Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.16.0-86.el8fdp |
openvswitch2.16-debugsource Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.16.0-86.el8fdp |
openvswitch2.16-devel Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.16.0-86.el8fdp |
openvswitch2.16-ipsec Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.16.0-86.el8fdp |
openvswitch2.16-test Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.16.0-86.el8fdp |
python3-openvswitch2.13 Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.13.0-139.el8fdp |
python3-openvswitch2.13-debuginfo Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.13.0-139.el8fdp |
python3-openvswitch2.15 Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.15.0-55.el8fdp |
python3-openvswitch2.15-debuginfo Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.15.0-55.el8fdp |
python3-openvswitch2.16 Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.16.0-86.el8fdp |
python3-openvswitch2.16-debuginfo Red Hat:enterprise_linux:8::fastdatapath | All versions | 0:2.16.0-86.el8fdp |
Products include Canonical Ubuntu Linux, Fedoraproject Fedora, Openvswitch Openvswitch, Redhat Enterprise Linux Fast Datapath.
How do I fix CVE-2021-3905?
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-2021-3905 being exploited?
There is no known exploitation of CVE-2021-3905 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as GHSA-w2f8-jf7v-2cj4, OESA-2022-1778, RHBA-2022:0051, RHBA-2022:0052, RHBA-2022:5792.