# CVE-2023-43478: Unauthenticated configuration restore and firmware update

> Unauthenticated attackers can upload malicious firmware or configurations to the Telstra Smart Modem, leading to root code execution.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Sep 2023
- **Updated:** 24 Sep 2024
- **Also known as:** GHSA-x2v2-mj6c-wfp3

## What is CVE-2023-43478?

CVE-2023-43478 is a high-severity vulnerability in Telstra Smart Modem Gen 2 (Arcadyan LH1000), published on 20 Sep 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

fake_upload.cgi on the Telstra Smart Modem Gen 2 (Arcadyan LH1000), firmware versions < 0.18.15r, allows unauthenticated attackers to upload firmware images and configuration backups, which could allow them to alter the firmware or the configuration on the device, ultimately leading to code execution as root.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2023-43478?

It affects 1 product.


Products: Telstra Arcadyan Lh1000 Firmware.

## How do I fix CVE-2023-43478?

No fix has been published for CVE-2023-43478 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-43478 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-43478 exists.

## Other vulnerabilities in Telstra Smart Modem Gen 2 (Arcadyan LH1000)

- [CVE-2023-43477](https://insights.sbomify.com/CVE-2023-43477/): Post-Auth Command Injection in Telstra Smart Modem Gen 2 (Arcadyan LH1000) (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-43478 and fix it if it is affected.

What it is: CVE-2023-43478 is a high-severity vulnerability in Telstra Smart Modem Gen 2 (Arcadyan LH1000), published on 20 Sep 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-43478 exists.

Affected product: Telstra Smart Modem Gen 2 (Arcadyan LH1000). 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-2023-43478/ (Markdown: https://insights.sbomify.com/CVE-2023-43478/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43478
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43478
- OSV: https://osv.dev/vulnerability/CVE-2023-43478

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-43478/
Summaries are generated and may contain mistakes; the official description above is the record.