# CVE-2021-39234: Raw block data can be read bypassing ACL/authorization

> Authenticated users can bypass ACLs to read raw block data in Apache Ozone by crafting specific requests with known block IDs.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 19 Nov 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-c8cw-2c5j-xff3

## What is CVE-2021-39234?

CVE-2021-39234 is a medium-severity missing authorization vulnerability in Apache Ozone, published on 19 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In Apache Ozone versions prior to 1.2.0, Authenticated users knowing the ID of an existing block can craft specific request allowing access those blocks, bypassing other security checks like ACL.

Weakness: CWE-863 (Incorrect Authorization), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-39234?

2 open source packages ship an affected version, including org.apache.ozone:ozone-main. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.apache.ozone:ozone-main` | Maven | All versions | 1.2.0 |
| `org.apache.ozone:ozone-main` | Maven | All versions | 1.2.0 |

Products: Apache Ozone.

## How do I fix CVE-2021-39234?

Upgrade org.apache.ozone:ozone-main to 1.2.0 or later.

## Is CVE-2021-39234 being exploited?

There is no known exploitation of CVE-2021-39234 in the wild and no public exploit code.

## Other vulnerabilities in Apache Ozone

- [CVE-2021-36372](https://insights.sbomify.com/CVE-2021-36372/): Original block tokens are persisted and can be retrieved (critical 9.8)
- [CVE-2021-39231](https://insights.sbomify.com/CVE-2021-39231/): Missing authentication/authorization on internal RPC endpoints (critical 9.1)
- [CVE-2021-39233](https://insights.sbomify.com/CVE-2021-39233/): Container-related datanode operations can be called without authorization (critical 9.1)
- [CVE-2021-39232](https://insights.sbomify.com/CVE-2021-39232/): Missing admin check for SCM related admin commands (high 8.8)
- [CVE-2021-39236](https://insights.sbomify.com/CVE-2021-39236/): Owners of the S3 tokens are not validated (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-39234 and fix it if it is affected.

What it is: CVE-2021-39234 is a medium-severity missing authorization vulnerability in Apache Ozone, published on 19 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-39234 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.apache.ozone:ozone-main (Maven): affected all versions; fixed in 1.2.0
- org.apache.ozone:ozone-main (Maven): affected all versions; fixed in 1.2.0

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-2021-39234/ (Markdown: https://insights.sbomify.com/CVE-2021-39234/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-39234
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-39234
- OSV: https://osv.dev/vulnerability/CVE-2021-39234

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-39234/
Summaries are generated and may contain mistakes; the official description above is the record.