PT-2021-24327 · Wolfssl · Wolfssl Wolfmqtt

Embhorn · Published 2021-12-31 · Updated 2022-01-11 · CVE-2021-45938

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: wolfSSL wolfMQTT version 1.9

Description: The issue is a heap-based buffer overflow in the MqttClient DecodePacket function, which is called from MqttClient WaitType and MqttClient Unsubscribe.

Recommendations: For wolfSSL wolfMQTT version 1.9, consider disabling the MqttClient DecodePacket function as a temporary workaround until a patch is available. Restrict access to the MqttClient WaitType and MqttClient Unsubscribe functions to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2021-45938

Affected Products

Wolfssl Wolfmqtt

References · 6

• 🔥 https://github.com/google/oss-fuzz-vulns/blob/main/vulns/wolfmqtt/OSV-2021-1353.yaml · Exploit
• 🔥 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39056 · Exploit
• https://github.com/wolfSSL/wolfMQTT/commit/84d4b53122e0fa0280c7872350b89d5777dabbb2 · Patch
• https://osv.dev/vulnerability/CVE-2021-45938 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-45938 · Security Note
• https://t.me/cibsecurity/34803 · Telegram Post