# CVE-2022-24402: Intentionally weakened effective strength in TETRA TEA1

> The TETRA TEA1 algorithm uses a weakened 32-bit key, allowing attackers to perform exhaustive search and decrypt communications.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:U/RC:C/CR:H/IR:H/AR:H/MAV:A/MAC:L/MPR:N/MUI:N/MS:U/MC:H/MI:H/MA:H`)
- **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:** 19 Oct 2023
- **Updated:** 12 Sep 2024
- **Also known as:** GHSA-2hcc-ww5c-44wh

## What is CVE-2022-24402?

CVE-2022-24402 is a high-severity vulnerability in ETSI TETRA Standard, published on 19 Oct 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The TETRA TEA1 keystream generator implements a key register initialization function that compresses the 80-bit key to only 32 bits for usage during the keystream generation phase, which is insufficient to safeguard against exhaustive search attacks.

Weakness: CWE-307 (Improper Restriction of Excessive Authentication Attempts), CWE-334 (Small Space of Random Values)

## Which versions are affected by CVE-2022-24402?

It affects 1 product.


Products: Midnightblue Tetra\.

## How do I fix CVE-2022-24402?

No fix has been published for CVE-2022-24402 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-24402 being exploited?

There is no known exploitation of CVE-2022-24402 in the wild and no public exploit code.

## Other vulnerabilities in ETSI TETRA Standard

- [CVE-2022-24401](https://insights.sbomify.com/CVE-2022-24401/): Keystream recovery for arbitrary frames in TETRA (high 8.8)
- [CVE-2022-24400](https://insights.sbomify.com/CVE-2022-24400/): DCK pinning attack in TETRA (high 7.5)
- [CVE-2022-24404](https://insights.sbomify.com/CVE-2022-24404/): Ciphertext Malleability in TETRA (medium 5.9)
- [CVE-2022-24403](https://insights.sbomify.com/CVE-2022-24403/): De-anonymization attack in TETRA (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-24402 and fix it if it is affected.

What it is: CVE-2022-24402 is a high-severity vulnerability in ETSI TETRA Standard, published on 19 Oct 2023. 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-2022-24402 in the wild and no public exploit code.

Affected product: ETSI TETRA Standard. 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-2022-24402/ (Markdown: https://insights.sbomify.com/CVE-2022-24402/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-24402
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-24402
- OSV: https://osv.dev/vulnerability/CVE-2022-24402

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-24402/
Summaries are generated and may contain mistakes; the official description above is the record.