Vulnerability · Published Oct 19, 2023 · Assigned by NCSC-NL
CVE-2022-26943Weak PRNG entropy source used for authentication challenge generation in Motorola MTM5000
High 8.8
In plain English
A high-severity security flaw in Mobile Radio from Motorola. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Motorola | Mobile Radio | MTM5000 |
Weakness: CWE-338 · Vector: 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
References
- TETRA:BURST related