# CVE-2023-5548: Moodle: cache poisoning risk with endpoint revision numbers

> Attackers can poison caches via weak revision numbers on file endpoints, potentially serving stale or malicious content to users.

- **Severity:** Low 3.3 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 9 Nov 2023
- **Updated:** 2 Aug 2024
- **Also known as:** BIT-moodle-2023-5548, GHSA-cwh2-q44x-5w3c, UBUNTU-CVE-2023-5548

## What is CVE-2023-5548?

CVE-2023-5548 is a low-severity vulnerability in Fedoraproject Extra Packages for Enterprise Linux, published on 9 Nov 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Stronger revision number limitations were required on file serving endpoints to improve cache poisoning protection.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity), CWE-349 (Acceptance of Extraneous Untrusted Data With Trusted Data)

## Which versions are affected by CVE-2023-5548?

3 open source packages ship an affected version, including moodle/moodle and moodle. It affects 3 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `moodle/moodle` | Packagist | All versions | 4.3.0-rc2 |
| `moodle/moodle` | Packagist | All versions | 4.3.0-rc2 |
| `moodle` | Bitnami | All versions | 3.9.24, 3.11.17, 4.0.11, 4.1.6, 4.2.3 |

Products: Fedoraproject Extra Packages for Enterprise Linux, Fedoraproject Fedora, Moodle Moodle.

## How do I fix CVE-2023-5548?

Upgrade moodle/moodle to 4.3.0-rc2 or later.

## Is CVE-2023-5548 being exploited?

There is no known exploitation of CVE-2023-5548 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Extra Packages for Enterprise Linux

- [CVE-2023-34152](https://insights.sbomify.com/CVE-2023-34152/): Command injection in ImageMagick (critical 9.8)
- [CVE-2022-4170](https://insights.sbomify.com/CVE-2022-4170/): Code injection in rxvt-unicode (critical 9.8)
- [CVE-2022-40315](https://insights.sbomify.com/CVE-2022-40315/): Moodle Minor SQL injection risk in admin user browsing (critical 9.8)
- [CVE-2022-45152](https://insights.sbomify.com/CVE-2022-45152/): Moodle blind Server-Side Request Forgery (SSRF) vulnerability in LTI provider library (critical 9.1)
- [CVE-2022-24882](https://insights.sbomify.com/CVE-2022-24882/): Server side NTLM does not properly check parameters in FreeRDP (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-5548 and fix it if it is affected.

What it is: CVE-2023-5548 is a low-severity vulnerability in Fedoraproject Extra Packages for Enterprise Linux, published on 9 Nov 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-5548 in the wild and no public exploit code.

Affected packages and fixed versions:
- moodle/moodle (Packagist): affected all versions; fixed in 4.3.0-rc2
- moodle/moodle (Packagist): affected all versions; fixed in 4.3.0-rc2
- moodle (Bitnami): affected all versions; fixed in 3.9.24, 3.11.17, 4.0.11, 4.1.6, 4.2.3

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-2023-5548/ (Markdown: https://insights.sbomify.com/CVE-2023-5548/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-5548
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-5548
- OSV: https://osv.dev/vulnerability/CVE-2023-5548

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-5548/
Summaries are generated and may contain mistakes; the official description above is the record.