CVE-2024-29195: Azure C SDK Integer Wraparound Vulnerability

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-26 · updated 2026-06-17
Weakness: CWE-120

Description

The azure-c-shared-utility is a C library for AMQP/MQTT communication to Azure Cloud Services. This library may be used by the Azure IoT C SDK for communication between IoT Hub and IoT Hub devices. An attacker can cause an integer wraparound or under-allocation or heap buffer overflow due to vulnerabilities in parameter checking mechanism, by exploiting the buffer length parameter in Azure C SDK, which may lead to remote code execution. Requirements for RCE are 1. Compromised Azure account allowing malformed payloads to be sent to the device via IoT Hub service, 2. By passing IoT hub service max message payload limit of 128KB, and 3. Ability to overwrite code space with remote code. Fixed in commit https://github.com/Azure/azure-c-shared-utility/commit/1129147c38ac02ad974c4c701a1e01b2141b9fe2.

Affected products

azure-c-shared-utility: through 2023-12-01
azure-c-shared-utility: before 2024.02.08 — fixed in 2024.02.08
azure-c-shared-utility: before 2024-02-08

How to fix

Upgrade to a fixed version: azure-c-shared-utility 2024.02.08. Check the vendor advisory for mitigations.

References

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