CVE-2022-26943 Weak PRNG entropy source used for authentication challenge generation in Motorola MTM5000

High 8.8 Published 19 Oct 2023 Updated 3 Aug 2024

Weak PRNG entropy allows attackers to predict authentication challenges, enabling unauthorized access to Motorola MTM5000 radios.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2022-26943?

CVE-2022-26943 is a high-severity vulnerability in Motorola Mobile Radio, 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 Motorola MTM5000 series firmwares generate TETRA authentication challenges using a PRNG using a tick count register as its sole entropy source. Low boottime entropy and limited re-seeding of the pool renders the authentication challenge vulnerable to two attacks. First, due to the limited boottime pool entropy, an adversary can derive the contents of the entropy pool by an exhaustive search of possible values, based on an observed authentication challenge. Second, an adversary can use knowledge of the entropy pool to predict authentication challenges. As such, the unit is vulnerable to CVE-2022-24400.

Weakness: CWE-338

Which versions are affected by CVE-2022-26943?

It affects 2 products.

Products include Motorola Mtm5400 Firmware, Motorola Mtm5500 Firmware.

How do I fix CVE-2022-26943?

No fix has been published for CVE-2022-26943 yet. Limit exposure of the affected software until one is available.

Is CVE-2022-26943 being exploited?

There is no known exploitation of CVE-2022-26943 in the wild and no public exploit code.

Sources

Also known as GHSA-cj2w-wj5h-c44x.