# CVE-2019-19101: Incomplete communication encryption and validation in B&R Automation Studio upgrade service

> Incomplete TLS validation in B&R Automation Studio allows unauthenticated attackers to perform man-in-the-middle attacks on the upgrade service.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 29 Apr 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-xfj2-8v99-wp6x

## What is CVE-2019-19101?

CVE-2019-19101 is a medium-severity vulnerability in B&R Automation Studio, published on 29 Apr 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A missing secure communication definition and an incomplete TLS validation in the upgrade service in B&R Automation Studio versions 4.0.x, 4.1.x, 4.2.x, < 4.3.11SP, < 4.4.9SP, < 4.5.5SP, < 4.6.4 and < 4.7.2 enable unauthenticated users to perform MITM attacks via the B&R upgrade server.

Weakness: CWE-295 (Improper Certificate Validation), CWE-326 (Inadequate Encryption Strength)

## Which versions are affected by CVE-2019-19101?

It affects 1 product.


Products: Br-Automation Automation Studio.

## How do I fix CVE-2019-19101?

No fix has been published for CVE-2019-19101 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-19101 being exploited?

There is no known exploitation of CVE-2019-19101 in the wild and no public exploit code.

## Other vulnerabilities in B&R Automation Studio

- [CVE-2024-0220](https://insights.sbomify.com/CVE-2024-0220/): B&R products use insufficient communication encryption (high 8.3)
- [CVE-2021-22282](https://insights.sbomify.com/CVE-2021-22282/): RCE in B&R Automation Studio with crafted project files (high 8.3)
- [CVE-2020-24681](https://insights.sbomify.com/CVE-2020-24681/): Automation Studio and PVI Multiple incorrect permission assignments for services (high 8.2)
- [CVE-2019-19100](https://insights.sbomify.com/CVE-2019-19100/): Privilege escalation via B&R Automation Studio upgrade service (high 7.5)
- [CVE-2021-22280](https://insights.sbomify.com/CVE-2021-22280/): DLL Hijacking Vulnerability in Automation Studio (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-19101 and fix it if it is affected.

What it is: CVE-2019-19101 is a medium-severity vulnerability in B&R Automation Studio, published on 29 Apr 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-19101 in the wild and no public exploit code.

Affected product: B&R Automation Studio. 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-2019-19101/ (Markdown: https://insights.sbomify.com/CVE-2019-19101/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-19101
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-19101
- OSV: https://osv.dev/vulnerability/CVE-2019-19101

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-19101/
Summaries are generated and may contain mistakes; the official description above is the record.