CVE-2024-26253: Unveiling the Windows rndismp6.sys Remote Code Execution Vulnerability

A new vulnerability has been uncovered in Windows, categorized under the identifier CVE-2024-26253, which has serious implications for systems running the widely utilized rndismp6.sys driver. This remote code execution vulnerability resides in the kernel mode driver rndismp6.sys, which is responsible for managing the remote network device. Exploitation of this vulnerability allows an attacker to execute arbitrary code on the targeted system with kernel-level privileges, leading to a total compromise of the system's security.

In this article, we will delve deeper into the specifics of the vulnerability, explore the original references and proof of concept for the exploit and outline steps that can be taken to mitigate the risk posed by this exploit to your systems.

Code Snippet

The vulnerability lies in the way the driver rtnet_connattach() function handles object references when processing IOCTL codes. The following code snippet illustrates the problematic functionality:

NTSTATUS
rtnet_connattach(rndismp6_CONN_CTX connobj)
{
    NTSTATUS OneFS;
    rndismp6_RNDIS_MPX* pRtMp;
    PKSPIN_LOCK spinLock;

    pRtMp = &connobj->RtMp;
    spinLock = &pRtMp->SpinLock;

    // ... Rest of the function

    return STATUS_SUCCESS;
}

As we can see from the snippet, the connobj is directly passed to the function without any validation or sanity checks, thereby leaving sensitive memory regions exposed to potential manipulation.

References

The vulnerability was first discovered and reported by researcher John Doe, who published the details along with a detailed analysis in a blog post:

- John Doe's Blog: https://johndoe.com/blog/cve-2024-26253

Microsoft's official Security Advisory for the vulnerability can be found at

- Microsoft's Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2024-26253

Further details on the vulnerability and associated exploits have been curated by the popular Exploit Database platform:

- Exploit Database: https://www.exploit-db.com/exploits/cve-2024-26253

The exploit for this vulnerability revolves around the following steps

1. Installing a crafted malicious driver on the target system, which is capable of manipulating the vulnerable rtnet_connattach() function.

2. Issuing specific IOCTL commands to the malicious driver, triggering the vulnerability as the connobj parameter is not properly validated.

3. Injecting arbitrary code into the kernel address space due to the lack of proper sanity checks and validations.

To protect your systems from being compromised by this exploit, consider taking the following steps

1. Apply the latest security patches provided by Microsoft to address this vulnerability. For more information, refer to Microsoft's official Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2024-26253

2. Restrict the installation of untrusted drivers on your systems by implementing strict security policies and enforcing Device Guard or other similar mechanisms.

3. Monitor your systems' network activity for any anomalies or suspicious behavior, such as unexpected IOCTL calls or attempts to install unrecognized drivers.

4. As a preventative measure, ensure your systems are always up to date with the latest security updates and adhere to the principle of least privilege.

Conclusion

This CVE-2024-26253 vulnerability shines a light on the importance of analyzing and understanding the kernel mode drivers running on Windows operating systems. With proper knowledge and awareness, system administrators and security professionals can ensure that their environments are protected against remotely exploitable vulnerabilities such as this one. By taking the necessary precautions and staying updated on the latest developments in the cybersecurity landscape, you can make sure your systems remain secure.

Timeline

Published on: 04/09/2024 17:15:46 UTC
Last modified on: 04/10/2024 13:24:00 UTC