# CVE-2020-10721: fabric8-maven-plugin: insecure way to construct Yaml Object leading to remote code execution

> A malicious YAML file can trigger unsafe deserialization in the fabric8-maven-plugin, leading to arbitrary code execution on the developer's machine.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** No
- **Published:** 22 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-w7gj-h6f2-x4c6

## What is CVE-2020-10721?

CVE-2020-10721 is a high-severity unsafe deserialization vulnerability in fabric8-maven-plugin, published on 22 Oct 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw was found in the fabric8-maven-plugin 4.0.0 and later. When using a wildfly-swarm or thorntail custom configuration, a malicious YAML configuration file on the local machine executing the maven plug-in could allow for deserialization of untrusted data resulting in arbitrary code execution. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2020-10721?

2 open source packages ship an affected version, including io.fabric8:fabric8-maven-plugin. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `io.fabric8:fabric8-maven-plugin` | Maven | From 4.0.0-M1 to 4.4.2 | None |
| `io.fabric8:fabric8-maven-plugin` | Maven | From 4.0.0-M1 to 4.4.2 | None |

Products: Redhat Fabric8-Maven.

## How do I fix CVE-2020-10721?

No fix has been published for CVE-2020-10721 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-10721 being exploited?

There is no known exploitation of CVE-2020-10721 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-10721 and fix it if it is affected.

What it is: CVE-2020-10721 is a high-severity unsafe deserialization vulnerability in fabric8-maven-plugin, published on 22 Oct 2020. 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-2020-10721 in the wild and no public exploit code.

Affected packages and fixed versions:
- io.fabric8:fabric8-maven-plugin (Maven): affected from 4.0.0-M1 up to 4.4.2; no fix listed
- io.fabric8:fabric8-maven-plugin (Maven): affected from 4.0.0-M1 up to 4.4.2; no fix listed

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-2020-10721/ (Markdown: https://insights.sbomify.com/CVE-2020-10721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-10721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-10721
- OSV: https://osv.dev/vulnerability/CVE-2020-10721

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-10721/
Summaries are generated and may contain mistakes; the official description above is the record.