Buffer overflow in Azure Azure-C-Shared-Utility
CVE-2024-29195
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.
Vulnerability class: Buffer Overflow
EPSS: 0.050 (91.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L.
Affected products
- Azure Azure-c-shared-utility — versions < 2024-02-08
- Microsoft Azure_c_shared_utility
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2024-29195?
- CVE-2024-29195 is a medium-severity vulnerability in Azure Azure-C-Shared-Utility, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.0/10. Published 2024-03-26.
- How severe is CVE-2024-29195?
- Medium severity. CVSS v3 base score is 6.0 out of 10.
- Is CVE-2024-29195 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.