CVE-2025-31719 TEE EcDSA算法内存一致性问题导致签名错误

// CVE-2025-31719 PoC - TEE EcDSA Memory Consistency Issue // Note: This is a theoretical PoC as actual exploitation requires specific hardware and TEE access #include <stdio.h> #include <pthread.h> #include <stdint.h> // Simulated TEE EcDSA signature context typedef struct { uint8_t private_key[32]; uint8_t signature[64]; uint32_t state; } ecdsa_context_t; ecdsa_context_t ctx; void* signature_worker(void* arg) { // Trigger ECDSA signature generation // In vulnerable implementation, memory consistency issues may occur for (int i = 0; i < 1000; i++) { // Simulate signature generation with concurrent access ctx.state = i; // Memory barrier missing in vulnerable code __asm__ volatile("" ::: "memory"); // Read private key - may get stale data due to consistency issue uint8_t key_copy[32]; for (int j = 0; j < 32; j++) { key_copy[j] = ctx.private_key[j]; } // Generate signature using potentially inconsistent key data // This may produce incorrect signatures with low probability } return NULL; } void* key_update_worker(void* arg) { // Concurrently update key material for (int i = 0; i < 1000; i++) { // Update private key for (int j = 0; j < 32; j++) { ctx.private_key[j] = (uint8_t)(i + j); } // Memory synchronization issue - no proper barrier ctx.state = 0xFFFFFFFF; // State update without proper sync } return NULL; } int main() { pthread_t t1, t2; // Initialize context memset(&ctx, 0, sizeof(ctx)); for (int i = 0; i < 32; i++) { ctx.private_key[i] = 0xAB; } // Create concurrent threads to trigger race condition pthread_create(&t1, NULL, signature_worker, NULL); pthread_create(&t2, NULL, key_update_worker, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); printf("PoC demonstration complete.\n"); printf("In vulnerable implementation, signatures may be incorrect.\n"); return 0; }