# CVE-2024-47126: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in goTenna Pro

> Attackers can brute force shared encryption keys due to weak PRNG usage in the goTenna Pro app when optional key broadcasting is enabled.

- **Severity:** High 7.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **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:** 26 Sep 2024
- **Updated:** 17 Oct 2024
- **Also known as:** GHSA-7vrc-hc62-3f49

## What is CVE-2024-47126?

CVE-2024-47126 is a high-severity vulnerability in goTenna Pro, published on 26 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The goTenna Pro App does not use SecureRandom when generating passwords 
for sharing cryptographic keys. The random function in use makes it 
easier for attackers to brute force this password if the broadcasted 
encryption key is captured over RF. This only applies to the optional 
broadcast of an encryption key, so it is advised to share the key with 
local QR code for higher security operations.

Weakness: CWE-338 (Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG))

## Which versions are affected by CVE-2024-47126?

It affects 1 product.


Products: Gotenna Gotenna Pro.

## How do I fix CVE-2024-47126?

No fix has been published for CVE-2024-47126 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-47126 being exploited?

There is no known exploitation of CVE-2024-47126 in the wild and no public exploit code.

## Other vulnerabilities in goTenna Pro

- [CVE-2024-47130](https://insights.sbomify.com/CVE-2024-47130/): Missing Authentication for Critical Function in goTenna Pro (high 8.7)
- [CVE-2024-47125](https://insights.sbomify.com/CVE-2024-47125/): Improper Restriction of Communication Channel to Intended Endpoints in goTenna Pro (high 7.6)
- [CVE-2024-47121](https://insights.sbomify.com/CVE-2024-47121/): Weak Passwords Requirements in goTenna Pro (medium 6.0)
- [CVE-2024-47123](https://insights.sbomify.com/CVE-2024-47123/): Missing Support for Integrity Check in goTenna Pro (medium 6.0)
- [CVE-2024-47127](https://insights.sbomify.com/CVE-2024-47127/): Weak Authentication in goTenna Pro (medium 6.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-47126 and fix it if it is affected.

What it is: CVE-2024-47126 is a high-severity vulnerability in goTenna Pro, published on 26 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-47126 in the wild and no public exploit code.

Affected product: goTenna Pro. 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-2024-47126/ (Markdown: https://insights.sbomify.com/CVE-2024-47126/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-47126
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-47126
- OSV: https://osv.dev/vulnerability/CVE-2024-47126

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-47126/
Summaries are generated and may contain mistakes; the official description above is the record.