# CVE-2023-43477: Post-Auth Command Injection in Telstra Smart Modem Gen 2 (Arcadyan LH1000)

> Authenticated attackers can inject commands via the ping_from parameter to execute code as root on Telstra Smart Modem Gen 2 devices.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **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-87jp-gf78-6p6w

## What is CVE-2023-43477?

CVE-2023-43477 is a medium-severity command injection 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

The ping_from parameter of ping_tracerte.cgi in the web UI of Telstra Smart Modem Gen 2 (Arcadyan LH1000), firmware versions < 0.18.15r, was not properly sanitized before being used in a system call, which could allow an authenticated attacker to achieve command injection as root on the device.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2023-43477?

It affects 1 product.


Products: Telstra Arcadyan Lh1000 Firmware.

## How do I fix CVE-2023-43477?

No fix has been published for CVE-2023-43477 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-43477 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-43477 exists.

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

- [CVE-2023-43478](https://insights.sbomify.com/CVE-2023-43478/): Unauthenticated configuration restore and firmware update (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-43477 and fix it if it is affected.

What it is: CVE-2023-43477 is a medium-severity command injection 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-2023-43477 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-2023-43477/ (Markdown: https://insights.sbomify.com/CVE-2023-43477/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43477
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43477
- OSV: https://osv.dev/vulnerability/CVE-2023-43477

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-43477/
Summaries are generated and may contain mistakes; the official description above is the record.