CVE-2024-29195

Azure C Shared Utility vulnerability

CVSS

6.0

EPSS

5.0%

EPSS pct

91th

Exploited

No known

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 vendor

Microsoft

Affected product

Azure C Shared Utility

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L

Weakness type (CWE)

CWE-120 — Classic Buffer Overflow

Published

2024-03-26

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring high privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, low impact to availability.

Its EPSS score of 5.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2024-29195

Confirm whether Microsoft Azure C Shared Utility is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2024-29195.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2024-29195

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