PT-2019-15003 · Arm · Arm Mbed Os

Thesilentdawn · Published 2019-11-04 · Updated 2019-11-13 · CVE-2019-17210

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Arm Mbed OS version 2017-11-02

Description A denial-of-service issue was discovered in the MQTT library. The readMQTTLenString() function is vulnerable to manipulation, allowing an attacker to change the mqttstring->lenstring.len value to a larger value, skipping the if statement and defaulting mqttstring->lenstring.data to zero. This leads to unpredictable program behavior when curn is accessed, which points to mqttstring->lenstring.data. The behavior is highly dependent on the actual firmware.

Recommendations For Arm Mbed OS version 2017-11-02, consider disabling the readMQTTLenString() function as a temporary workaround until a patch is available. Restrict access to the MQTT library to minimize the risk of exploitation. Avoid using the mqttstring->lenstring.len variable in the affected function until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2019-17210

Affected Products

Arm Mbed Os

References · 3

• https://osv.dev/vulnerability/CVE-2019-17210 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-17210 · Security Note
• https://github.com/ARMmbed/mbed-os/issues/11802 · Note