CVE-2025-62469

// CVE-2025-62469 PoC - Race Condition in Microsoft Brokering File System // This PoC demonstrates the race condition vulnerability concept // Note: This is for educational purposes only #include <windows.h> #include <stdio.h> #include <threads.h> #define MAX_ATTEMPTS 1000 volatile LONG g_shared_counter = 0; volatile BOOL g_trigger_race = FALSE; int race_thread(void* arg) { while (!g_trigger_race) { // Busy wait for trigger } // Simulate unsafe read-modify-write operation for (int i = 0; i < MAX_ATTEMPTS; i++) { LONG old_value = g_shared_counter; // Small delay to increase chance of race condition Sleep(0); LONG new_value = old_value + 1; // Check-then-act without proper synchronization if (InterlockedCompareExchange(&g_shared_counter, new_value, old_value) != old_value) { printf("Race condition detected at attempt %d\n", i); // Here attacker could manipulate the shared resource } } return 0; } int main() { printf("CVE-2025-62469 Race Condition PoC\n"); printf("Target: Microsoft Brokering File System\n\n"); thrd_t threads[4]; // Create multiple threads to trigger race condition for (int i = 0; i < 4; i++) { thrd_create(&threads[i], race_thread, NULL); } Sleep(100); // Allow threads to start g_trigger_race = TRUE; // Wait for all threads for (int i = 0; i < 4; i++) { thrd_join(threads[i], NULL); } printf("Final counter value: %ld (expected: %d)\n", g_shared_counter, MAX_ATTEMPTS * 4); printf("Race condition test completed\n"); return 0; }

{"cve": {"id": "CVE-2025-62469", "sourceIdentifier": "[email protected]", "published": "2025-12-09T18:15:59.063", "lastModified": "2025-12-12T20:04:14.387", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Brokering File System 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:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.0, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-362"}, {"lang": "en", "value": "CWE-415"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"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_2025:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.7392", "matchCriteriaId": "35BBEADA-D039-479B-A1BA-B2A7E37235BE"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62469", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}