CVE-2024-26252 - Exploring the Windows rndismp6.sys Remote Code Execution Vulnerability and Its Exploitation

CVE-2024-26252 outlines a critical vulnerability in the Microsoft Windows rndismp6.sys driver, potentially allowing an attacker to execute remote code on a target system. This vulnerability stems from a bug in the driver's processing of specially crafted network packets. In this post, we will delve into the exploit details, provide a code snippet to demonstrate the issue, and link to original references for further understanding.

Background

The rndismp6.sys driver is responsible for the proper functioning of Remote Network Driver Interface Specification (RNDIS) devices on Windows systems. RNDIS is a protocol for virtual communication between a host and a physical network device, developed by Microsoft. It allows for the communication of ethernet packets over a USB interface, commonly used for sharing network connectivity between devices, such as a PC and a smartphone.

Exploit Details

This vulnerability exists in the processing of network packets by the rndismp6.sys driver. By sending a specially crafted packet, an attacker can trigger an out-of-bounds buffer overflow issue. This, in turn, could allow arbitrary code execution on the target system, potentially leading to a complete system compromise. An attacker would need to be on the same local network or have access to a connected RNDIS device, which may limit the attack surface somewhat.

To exploit this vulnerability, a rogue packet may be constructed as follows

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

unsigned char exploit_payload[] = {
    /* ... Exploit payload code here ... */
};

void craft_rogue_packet(unsigned char *buffer, size_t buffer_size) {
    /* ... Craft the rogue packet here ... */
    memcpy(buffer + SOME_OFFSET, exploit_payload, sizeof(exploit_payload));
}

When the crafted packet is sent out to a vulnerable device with the rndismp6.sys driver, it triggers the buffer overflow. Next, the exploit payload is executed, and the attacker gains control of the vulnerable system.

Original References

Microsoft has acknowledged this vulnerability and assigned it the identifier CVE-2024-26252. More information can be found in the following references:

1. CVE-2024-26252 - National Vulnerability Database (NVD)
2. Microsoft Security Advisory for CVE-2024-26252

Mitigation

While there is no known patch for this vulnerability at the time of writing, users are advised to restrict access to their network and ensure it is only accessible to trusted devices. Furthermore, users should regularly update their Windows systems and keep their antivirus software updated.

Conclusion

CVE-2024-26252 is a critical remote code execution vulnerability affecting the rndismp6.sys driver on Windows systems. An attacker, with access to the same network as a target or a connected RNDIS device, can exploit this vulnerability to gain control of the target system. Users should follow the recommendations above to reduce their risk of being compromised by this vulnerability.

Timeline

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