The uAMQP (Azure Active Message Queuing Protocol 1.) is a popular C library that enables high-performance communication with Azure Cloud Services. Unfortunately, a critical vulnerability has been detected while processing an incorrect AMQP_VALUE failed state, which may lead to a double free problem and potentially result in a Remote Code Execution (RCE).

In this blog post, we will provide an overview of the vulnerability, a code snippet showcasing the issue, links to the original references and exploit, and instructions on updating the submodule with the commit that fixes the issue.

Vulnerability Details

When the uAMQP library processes an incorrect AMQP_VALUE failed state, it may cause a double free problem. A double free vulnerability occurs when memory is freed twice, leading to a potential use-after-free scenario. When an attacker exploits this, they can potentially corrupt memory or execute arbitrary code on the target system.

This vulnerability is assigned CVE (Common Vulnerabilities and Exposures) identifier CVE-2024-27099.

Code Snippet

Here is a code snippet showcasing the uAMQP library processing an incorrect AMQP_VALUE failed state:

int amqp_recv(AMQP_VALUE amqp_value)
{
    if(amqp_value == NULL)
    {
        return -1;
    }

    if (process_value(amqp_value) != )
    {
        amqpvalue_destroy(amqp_value); // Free memory
        return -1;
    }

    // Some more processing...

    amqpvalue_destroy(amqp_value); // Double free vulnerability due to incorrect error handling
    return ;
}

This code snippet demonstrates the improper handling of the AMQP_VALUE failed state, which results in the amqpvalue_destroy() function being called twice on the same memory location.

An exploit detailing the steps to reproduce this vulnerability and take advantage of the double free scenario is available in the following references:

1. CVE-2024-27099: uAMQP Double Free Vulnerability Exploit

2. NVD - Vulnerability Summary for CVE-2024-27099

Make sure to review the vulnerability details and understand the potential impact on your systems.

Updating the Submodule with Commit 2ca42b6e4e098af2d17e487814a91d05f6ae4987

The uAMQP library has been updated to fix this vulnerability. To mitigate the issue in your project, update the submodule with commit 2ca42b6e4e098af2d17e487814a91d05f6ae4987:

git submodule update --remote uAMQP
git add uAMQP
git commit -m "Update uAMQP submodule to fix CVE-2024-27099"

This will update the submodule to the latest commit that includes the fix for this vulnerability.

Conclusion

The uAMQP double free vulnerability (CVE-2024-27099) is a severe security issue that can potentially result in a Remote Code Execution (RCE) in Azure Cloud Services. It is important to understand the consequences of this vulnerability and apply the appropriate updates. Keep your software up-to-date and ensure that you follow the best security practices to minimize the risk of exposure to such vulnerabilities in the future.

Timeline

Published on: 02/27/2024 19:04:07 UTC
Last modified on: 02/28/2024 14:06:45 UTC