CVE-2024-27099 in azure-uamqp-c
Summary
by MITRE • 02/27/2024
The uAMQP is a C library for AMQP 1.0 communication to Azure Cloud Services. When processing an incorrect `AMQP_VALUE` failed state, may cause a double free problem. This may cause a RCE. Update submodule with commit 2ca42b6e4e098af2d17e487814a91d05f6ae4987.
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Analysis
by VulDB Data Team • 02/14/2025
The uAMQP library represents a critical security vulnerability classified as CVE-2024-27099 that affects the underlying C implementation used for AMQP 1.0 communication with Azure Cloud Services. This vulnerability manifests specifically during the processing of malformed `AMQP_VALUE` failed states, creating a dangerous double free condition within the memory management system. The flaw exists at the intersection of protocol handling and memory allocation, where improper state transitions lead to memory corruption that can be exploited by attackers to execute arbitrary code on affected systems.
The technical implementation of this vulnerability stems from inadequate error handling within the AMQP protocol processing logic. When the library encounters an incorrect `AMQP_VALUE` in a failed state, the memory cleanup routines execute twice on the same memory block, resulting in a double free condition that corrupts the heap management structures. This type of vulnerability maps directly to CWE-415, which describes improper handling of memory deallocation sequences, and potentially to CWE-416 when the subsequent use of freed memory leads to code execution. The memory corruption created by this double free can be leveraged to manipulate program execution flow through controlled memory overwrite attacks.
The operational impact of CVE-2024-27099 extends beyond simple denial of service, as the vulnerability creates a potential remote code execution vector that could allow attackers to gain unauthorized access to systems communicating with Azure services through the uAMQP library. Systems utilizing this library for cloud communication, particularly those in industrial control systems, IoT deployments, or enterprise environments relying on Azure cloud services, face significant risk. The vulnerability's exploitation potential aligns with ATT&CK technique T1059.007 for command and script execution, as successful exploitation could enable attackers to execute malicious code on compromised systems. Organizations using affected versions of the uAMQP library must urgently assess their attack surface and implement mitigation strategies.
The recommended mitigation strategy involves updating the affected submodule to the specific commit referenced in the advisory, which contains the necessary fixes to address the double free condition. This update resolves the improper memory handling logic that leads to the vulnerability. Additionally, organizations should implement network segmentation to limit access to systems using the vulnerable library, deploy intrusion detection systems to monitor for exploitation attempts, and conduct comprehensive vulnerability assessments of their Azure cloud service integrations. The fix addresses the root cause by implementing proper memory management practices and ensuring that deallocation routines execute only once per memory block, thereby preventing the heap corruption that enables remote code execution attacks.