# CVE-2022-24042: Auth bypass in Desigo DXR2

> Attackers can reuse expired session tokens to bypass authentication and gain unauthorized access to Siemens Desigo building automation controllers.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 May 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-7rrh-86wh-4q5p

## What is CVE-2022-24042?

CVE-2022-24042 is a critical authentication bypass vulnerability in Siemens Desigo DXR2, published on 10 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been identified in Desigo DXR2 (All versions < V01.21.142.5-22), Desigo PXC3 (All versions < V01.21.142.4-18), Desigo PXC4 (All versions < V02.20.142.10-10884), Desigo PXC5 (All versions < V02.20.142.10-10884). The web application returns an AuthToken that does not expire at the defined auto logoff delay timeout. An attacker could be able to capture this token and re-use old session credentials or session IDs for authorization.

Weakness: CWE-613 (DEPRECATED: Insufficient Session Expiration)

## Which versions are affected by CVE-2022-24042?

It affects 4 products.


Products: Siemens Desigo Dxr2 Firmware, Siemens Desigo Pxc3 Firmware, Siemens Desigo Pxc4 Firmware, Siemens Desigo Pxc5 Firmware.

## How do I fix CVE-2022-24042?

No fix has been published for CVE-2022-24042 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-24042 being exploited?

There is no known exploitation of CVE-2022-24042 in the wild and no public exploit code.

## Other vulnerabilities in Siemens Desigo DXR2

- [CVE-2021-41545](https://insights.sbomify.com/CVE-2021-41545/): Denial of service in Desigo DXR2 (high 7.5)
- [CVE-2022-24044](https://insights.sbomify.com/CVE-2022-24044/): Auth bypass in Desigo DXR2 (high 7.5)
- [CVE-2022-24040](https://insights.sbomify.com/CVE-2022-24040/): Denial of service in Desigo DXR2 (medium 6.5)
- [CVE-2022-24041](https://insights.sbomify.com/CVE-2022-24041/): Weak cryptography in Desigo DXR2 (medium 6.5)
- [CVE-2022-24045](https://insights.sbomify.com/CVE-2022-24045/): Information disclosure in Desigo DXR2 (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-24042 and fix it if it is affected.

What it is: CVE-2022-24042 is a critical authentication bypass vulnerability in Siemens Desigo DXR2, published on 10 May 2022. 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-2022-24042 in the wild and no public exploit code.

Affected product: Siemens Desigo DXR2. 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-2022-24042/ (Markdown: https://insights.sbomify.com/CVE-2022-24042/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-24042
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-24042
- OSV: https://osv.dev/vulnerability/CVE-2022-24042

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-24042/
Summaries are generated and may contain mistakes; the official description above is the record.