Description

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions 4.2.1 and below contain an information disclosure vulnerability in the UDR (Unified Data Repository) service. The handler for GET /nudr-dr/v2/application-data/influenceData/subs-to-notify sends an HTTP 400 error response when required query parameters are missing but does not return afterward. Execution continues into the processor function, which queries the data repository and appends the full list of Traffic Influence Subscriptions, including SUPI/IMSI values, to the response body. An unauthenticated attacker with network access to the 5G Service Based Interface can retrieve stored subscriber identifiers with a single parameterless HTTP GET request. The SUPI is the most sensitive subscriber identifier in 5G networks, and its exposure undermines the privacy guarantees of the 3GPP SUCI concealment mechanism at the core network level. A similar bypass exists when sending a malformed snssai parameter due to the same missing return pattern.

Type de vulnérabilité

• CWE-200
• CWE-202
• CWE-209

Vecteur d'attaque

Complexité : LOW

Privilèges requis : NONE

Interaction utilisateur : NONE

Impact

• Confidentialité : HIGH
• Intégrité : NONE
• Disponibilité : NONE

Recommandations

Appliquer les correctifs de sécurité fournis par le vendeur dès que possible.