# CVE-2024-29976: Information disclosure in NAS326 firmware

> An authenticated attacker can obtain administrator session cookies via the show_allsessions command, potentially leading to account takeover on Zyxel NAS devices.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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:** No
- **Published:** 4 Jun 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-f5mr-vq5h-37xc

## What is CVE-2024-29976?

CVE-2024-29976 is a medium-severity vulnerability in Zyxel NAS326 firmware, published on 4 Jun 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

** UNSUPPORTED WHEN ASSIGNED **
The improper privilege management vulnerability in the command “show_allsessions” in Zyxel NAS326 firmware versions before V5.21(AAZF.17)C0 and NAS542 firmware versions before V5.21(ABAG.14)C0 could allow an authenticated attacker to obtain a logged-in administrator’s session information containing cookies on an affected device.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2024-29976?

It affects 2 products.


Products: Zyxel Nas326 Firmware, Zyxel Nas542 Firmware.

## How do I fix CVE-2024-29976?

No fix has been published for CVE-2024-29976 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-29976 being exploited?

There is no known exploitation of CVE-2024-29976 in the wild and no public exploit code.

## Other vulnerabilities in Zyxel NAS326 firmware

- [CVE-2023-27992](https://insights.sbomify.com/CVE-2023-27992/): Zyxel Multiple NAS Devices Command Injection (critical 9.8, exploited in the wild)
- [CVE-2024-6342](https://insights.sbomify.com/CVE-2024-6342/): Command injection in NAS326 firmware (critical 9.8)
- [CVE-2024-29972](https://insights.sbomify.com/CVE-2024-29972/): Command injection in NAS326 firmware (critical 9.8)
- [CVE-2024-29973](https://insights.sbomify.com/CVE-2024-29973/): Command injection in NAS326 firmware (critical 9.8)
- [CVE-2024-29974](https://insights.sbomify.com/CVE-2024-29974/): File upload in NAS326 firmware (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-29976 and fix it if it is affected.

What it is: CVE-2024-29976 is a medium-severity vulnerability in Zyxel NAS326 firmware, published on 4 Jun 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-29976 in the wild and no public exploit code.

Affected product: Zyxel NAS326 firmware. 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-2024-29976/ (Markdown: https://insights.sbomify.com/CVE-2024-29976/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-29976
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-29976
- OSV: https://osv.dev/vulnerability/CVE-2024-29976

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-29976/
Summaries are generated and may contain mistakes; the official description above is the record.