Hyundai Motor America Blue Link
Plan Patch7.5ICS-CERT ICSA-17-115-03Apr 25, 2017
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
Hyundai Motor America Blue Link versions 3.9.4 and 3.9.5 contain improper certificate validation and weak authentication mechanisms (CWE-300, CWE-321) that allow remote attackers to read vehicle data without authentication. The vulnerabilities affect the Blue Link mobile application communication with Hyundai's backend service. Blue Link Version 3.9.6, released March 6, 2017 (Android) and March 8, 2017 (iOS), mitigates these issues.
What this means
What could happen
An attacker could remotely read sensitive vehicle data from the Blue Link mobile app without authentication, potentially exposing vehicle location, status, and other operational information.
Who's at risk
Fleet operators and municipal vehicle owners using Hyundai vehicles with Blue Link telematics integration should prioritize this update. Affected are Hyundai vehicles equipped with the Blue Link connected-car platform that rely on the mobile application for remote monitoring and control.
How it could be exploited
An attacker on the internet can send specially crafted requests to the Blue Link service without credentials, exploiting improper certificate validation and insufficient authentication mechanisms to access vehicle data associated with a target user's account.
Prerequisites
- Network access to Blue Link service endpoints
- Target vehicle must be registered with Blue Link service
- No authentication credentials required
remotely exploitableno authentication requiredlow complexityaffects connected vehicle systemshigh CVSS score (7.5)
Exploitability
Low exploit probability (EPSS 0.9%)
Affected products (2)
2 with fix
ProductAffected VersionsFix Status
Blue Link:3.9.43.9.6
Blue Link:3.9.53.9.6
Remediation & Mitigation
0/2
Schedule — requires maintenance window
0/2Patching may require device reboot — plan for process interruption
HOTFIXUpdate Blue Link application to version 3.9.6 or later on Android and iOS devices
HARDENINGReview network access logs for unauthorized Blue Link API requests to identify potential exploitation
CVEs (2)
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API:
/api/v1/advisories/2ed99577-ac8e-4f1d-9792-7d33e685a6f7