CVE-2025-36934: Google Android bigo.c 竞态条件导致Use After Free本地权限提升漏洞

// CVE-2025-36934 PoC Concept (Pseudocode) // This is a conceptual PoC demonstrating the race condition trigger // Actual exploitation requires kernel-level access #include <pthread.h> #include <stdint.h> // Simulated bigo_worker_thread structure typedef struct { void* shared_object; int thread_id; volatile int state; } bigo_worker_context_t; // Global flag to control race condition timing volatile int g_race_trigger = 0; void* victim_thread(void* arg) { bigo_worker_context_t* ctx = (bigo_worker_context_t*)arg; // Thread 1: Access shared object while (!g_race_trigger) {} // Use after free - object may have been freed by another thread if (ctx->shared_object != NULL) { // Access freed memory uint64_t* ptr = (uint64_t*)ctx->shared_object; *ptr = 0x4141414141414141; // Write primitive } return NULL; } void* attacker_thread(void* arg) { bigo_worker_context_t* ctx = (bigo_worker_context_t*)arg; // Trigger race condition g_race_trigger = 1; // Free the object while victim thread is using it if (ctx->shared_object != NULL) { free(ctx->shared_object); // UAF trigger ctx->shared_object = NULL; } return NULL; } int trigger_cve_2025_36934() { bigo_worker_context_t ctx; pthread_t t1, t2; // Initialize shared object ctx.shared_object = malloc(64); ctx.state = 0; // Create threads to trigger race condition pthread_create(&t1, NULL, victim_thread, &ctx); pthread_create(&t2, NULL, attacker_thread, &ctx); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; } /* * Note: This is a simplified conceptual PoC. * Real exploitation requires: * 1. Kernel module access (bigo.ko) * 2. Precise timing control via system calls * 3. Heap spraying techniques for object placement * 4. Kernel ROP chain for privilege escalation */