Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability in the gpsd software could allow an attacker to disrupt services or potentially execute malicious code by sending specially crafted data packets. This issue impacts systems that rely on gpsd for location data, and while typically a local service, its potential for broad impact warrants attention.
- gpsd can be disrupted by malicious data.
- Affects systems using gpsd for location services.
- Confirm relevance and exposure to mitigate risk.
Attack Path
How an attacker could exploit the issue
An attacker can remotely trigger a vulnerability in the gpsd service by sending specially crafted NMEA2000 packets. The service, which processes GPS data, does not properly check the number of satellites reported in a specific packet type. This could lead to memory corruption, potentially allowing an attacker to disrupt the service or execute their own code.
- No authentication or user interaction needed.
- Triggered by malformed NMEA2000 packets.
- Risk of denial-of-service or code execution.
Live Threat
Current exploitation, exposure, and threat context
When supported by the advisory, this vulnerability could allow an unauthenticated attacker to corrupt memory in the gpsd service by sending specially crafted NMEA2000 packets. This could lead to the service crashing or, under certain conditions, potentially allow the attacker to execute arbitrary code.
- gpsd service memory.
- Network-sent NMEA2000 packets.
- Service instability or code execution.
Operational Fix
Recommended remediation, mitigation, and detection steps
The critical vulnerability in gpsd's NMEA2000 PGN 129540 handling impacts systems that process these specific GPS packets, potentially leading to memory corruption or code execution. System owners and platform teams are likely responsible for managing gpsd deployments. The first practical step involves identifying all instances of gpsd, determining their network exposure and business criticality, and then coordinating remediation with the accountable teams, which may involve vendor coordination or temporary risk reduction measures if immediate patching is not feasible.
- Ownership: Platform and application owners.
- Verify: Network reachability and asset criticality.
- Action: Plan and execute risk-based remediation.
