# CVE-2020-29056: Command injection in n/a

> Attackers can escape a shell and gain root privileges on CDATA network devices by exploiting the TFTP download configuration.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Nov 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-3496-765w-5xgq

## What is CVE-2020-29056?

CVE-2020-29056 is a critical command injection vulnerability in n/a, published on 24 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered on CDATA 72408A, 9008A, 9016A, 92408A, 92416A, 9288, 97016, 97024P, 97028P, 97042P, 97084P, 97168P, FD1002S, FD1104, FD1104B, FD1104S, FD1104SN, FD1108S, FD1204S-R2, FD1204SN, FD1204SN-R2, FD1208S-R2, FD1216S-R1, FD1608GS, FD1608SN, FD1616GS, FD1616SN, and FD8000 devices. One can escape from a shell and acquire root privileges by leveraging the TFTP download configuration.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2020-29056?

It affects 29 products.


Products: Cdata Fd1104 Firmware, Cdatatec 72408a Firmware, Cdatatec 9008a Firmware, Cdatatec 9016a Firmware, Cdatatec 92408a Firmware, Cdatatec 92416a Firmware, Cdatatec 9288 Firmware, Cdatatec 97016 Firmware, Cdatatec 97024p Firmware, Cdatatec 97028p Firmware, Cdatatec 97042p Firmware, Cdatatec 97084p Firmware, Cdatatec 97168p Firmware, Cdatatec Fd1002s Firmware, Cdatatec Fd1104 Firmware, Cdatatec Fd1104b Firmware, Cdatatec Fd1104s Firmware, Cdatatec Fd1104sn Firmware, Cdatatec Fd1108s Firmware, Cdatatec Fd1204s-R2 Firmware and 9 more.

## How do I fix CVE-2020-29056?

No fix has been published for CVE-2020-29056 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-29056 being exploited?

There is no known exploitation of CVE-2020-29056 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-29056 and fix it if it is affected.

What it is: CVE-2020-29056 is a critical command injection vulnerability in n/a, published on 24 Nov 2020. 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-2020-29056 in the wild and no public exploit code.

Affected product: n/a. 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-2020-29056/ (Markdown: https://insights.sbomify.com/CVE-2020-29056/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-29056
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-29056
- OSV: https://osv.dev/vulnerability/CVE-2020-29056

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-29056/
Summaries are generated and may contain mistakes; the official description above is the record.