# CVE-2023-42796: Path traversal in CP-8031 MASTER MODULE

> Authenticated attackers can traverse directories to download arbitrary files and potentially escalate privileges to administrator on Siemens CP-8031/8050 modules.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C`)
- **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:** 10 Oct 2023
- **Updated:** 27 Feb 2025
- **Also known as:** GHSA-fvx8-3v89-2x6h

## What is CVE-2023-42796?

CVE-2023-42796 is a high-severity path traversal vulnerability in Siemens CP-8031 MASTER MODULE, published on 10 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability has been identified in CP-8031 MASTER MODULE (All versions < CPCI85 V05.11), CP-8050 MASTER MODULE (All versions < CPCI85 V05.11). The web server of affected devices fails to properly sanitize user input for the /sicweb-ajax/tmproot/ endpoint.

This could allow an authenticated remote attacker to traverse directories on the system and download arbitrary files. By exploring active session IDs, the vulnerability could potentially be leveraged to escalate privileges to the administrator role.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2023-42796?

It affects 2 products.


Products: Siemens Cp-8031 Firmware, Siemens Cp-8050 Firmware.

## How do I fix CVE-2023-42796?

No fix has been published for CVE-2023-42796 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-42796 being exploited?

There is no known exploitation of CVE-2023-42796 in the wild and no public exploit code.

## Other vulnerabilities in Siemens CP-8031 MASTER MODULE

- [CVE-2023-36380](https://insights.sbomify.com/CVE-2023-36380/): Hardcoded credentials in CP-8031 MASTER MODULE (critical 9.8)
- [CVE-2023-28489](https://insights.sbomify.com/CVE-2023-28489/): Command injection in CP-8031 MASTER MODULE (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-42796 and fix it if it is affected.

What it is: CVE-2023-42796 is a high-severity path traversal vulnerability in Siemens CP-8031 MASTER MODULE, published on 10 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-42796 in the wild and no public exploit code.

Affected product: Siemens CP-8031 MASTER MODULE. 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-2023-42796/ (Markdown: https://insights.sbomify.com/CVE-2023-42796/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-42796
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-42796
- OSV: https://osv.dev/vulnerability/CVE-2023-42796

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-42796/
Summaries are generated and may contain mistakes; the official description above is the record.