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.
References
Link Providers
https://tetraburst.com/ cve-icon cve-icon cve-icon
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: NCSC-NL

Published: 2023-10-19T09:34:20.646Z

Updated: 2024-08-03T05:18:38.337Z

Reserved: 2022-03-11T22:19:24.849Z

Link: CVE-2022-26943

cve-icon Vulnrichment

Updated: 2024-08-03T05:18:38.337Z

cve-icon NVD

Status : Modified

Published: 2023-10-19T10:15:09.963

Modified: 2023-11-07T03:45:15.897

Link: CVE-2022-26943

cve-icon Redhat

No data.