Platform
c
Component
azure-uamqp-c
Fixed in
2024.0.1
CVE-2024-21646 describes a Remote Code Execution (RCE) vulnerability within the Azure uAMQP library, a C library used for AMQP 1.0 communication. An attacker can exploit this flaw by sending specially crafted binary data, resulting in an integer overflow and potential code execution. This vulnerability impacts versions of Azure uAMQP prior to 2024-01-01, and a patch is available in version 2024-01-01.
The impact of CVE-2024-21646 is severe. Successful exploitation allows an attacker to execute arbitrary code on the system utilizing the Azure uAMQP library. This could lead to complete system compromise, data theft, or denial of service. Given the library's use in various AMQP clients, the potential blast radius is significant, affecting any application relying on vulnerable versions of Azure uAMQP. The integer overflow vulnerability is similar in nature to other memory corruption issues that have historically been exploited for RCE, highlighting the potential for rapid exploitation if a public proof-of-concept is released.
CVE-2024-21646 was publicly disclosed on January 9, 2024. Its CRITICAL CVSS score indicates a high probability of exploitation. As of this writing, it is not listed on the CISA KEV catalog, but this could change. The availability of a patch suggests that Microsoft is aware of the potential for exploitation. The absence of a public proof-of-concept does not diminish the risk, as the vulnerability's nature makes it relatively straightforward to exploit.
Exploit Status
EPSS
2.49% (85% percentile)
CVSS Vector
The primary mitigation for CVE-2024-21646 is to immediately upgrade to version 2024-01-01 or later. If upgrading is not immediately feasible due to compatibility issues or testing requirements, consider implementing input validation on the binary data received by the AMQP client. This validation should specifically check for potential integer overflows. While not a complete solution, this can reduce the attack surface. Monitor network traffic for unusual binary data patterns indicative of exploitation attempts. After upgrading, confirm the fix by sending a test message containing the crafted binary data that triggers the vulnerability and verifying that it no longer results in an overflow.
Update the azure-uamqp-c library to version 2024-01-01 or later. This corrects the remote code execution vulnerability caused by an integer overflow or memory safety issue when receiving crafted binary data. The update can be performed by downloading the latest version from the repository and replacing the existing library.
Vulnerability analysis and critical alerts directly to your inbox.
CVE-2024-21646 is a critical Remote Code Execution vulnerability in the Azure uAMQP library, allowing attackers to execute code through crafted binary data.
You are affected if you are using Azure uAMQP versions prior to 2024-01-01. Check your dependencies and upgrade immediately.
Upgrade to version 2024-01-01 or later. If immediate upgrade is not possible, implement input validation on binary data.
While no active exploitation has been publicly confirmed, the vulnerability's severity and ease of exploitation suggest a high risk of future attacks.
Refer to the Microsoft Security Update Guide for details: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21646
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