Vulnerability Description
A denial-of-service issue was discovered in the MQTT library in Arm Mbed OS 2017-11-02. The function readMQTTLenString() is called by the function MQTTDeserialize_publish() to get the length and content of the MQTT topic name. In the function readMQTTLenString(), mqttstring->lenstring.len is a part of user input, which can be manipulated. An attacker can simply change it to a larger value to invalidate the if statement so that the statements inside the if statement are skipped, letting the value of mqttstring->lenstring.data default to zero. Later, curn is accessed, which points to mqttstring->lenstring.data. On an Arm Cortex-M chip, the value at address 0x0 is actually the initialization value for the MSP register. It is highly dependent on the actual firmware. Therefore, the behavior of the program is unpredictable from this time on.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Arm | Mbed-Mqtt | 2017-11-02 |
| Arm | Mbed-Os | - |
Related Weaknesses (CWE)
References
- https://github.com/ARMmbed/mbed-os/issues/11802Issue TrackingThird Party Advisory
- https://github.com/ARMmbed/mbed-os/issues/11802Issue TrackingThird Party Advisory
FAQ
What is CVE-2019-17210?
CVE-2019-17210 is a vulnerability with a CVSS score of 7.5 (HIGH). A denial-of-service issue was discovered in the MQTT library in Arm Mbed OS 2017-11-02. The function readMQTTLenString() is called by the function MQTTDeserialize_publish() to get the length and conte...
How severe is CVE-2019-17210?
CVE-2019-17210 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-17210?
Check the references section above for vendor advisories and patch information. Affected products include: Arm Mbed-Mqtt, Arm Mbed-Os.