CVE-2019-17210
Severity CVSS v4.0:
Pending analysis
Type:
CWE-20
Input Validation
Publication date:
04/11/2019
Last modified:
13/11/2019
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.
Impact
Base Score 3.x
7.50
Severity 3.x
HIGH
Base Score 2.0
5.00
Severity 2.0
MEDIUM
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:a:arm:mbed-mqtt:2017-11-02:*:*:*:*:*:*:* | ||
| cpe:2.3:o:arm:mbed-os:-:*:*:*:*:*:*:* |
To consult the complete list of CPE names with products and versions, see this page