The following code is for security research and authorized testing only.
python
/*
* CVE-2025-63757 PoC - Integer overflow in FFmpeg yuv2ya16_X_c_template
* This PoC demonstrates triggering the integer overflow in libswscale
* Compile: gcc -o poc poc.c -lavutil -lavcodec -lavformat -lavswscale
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
// Simulate the vulnerable function behavior
void simulate_yuv2ya16_overflow(int width, int height, int srcStride, int dstStride) {
// Vulnerable calculation without overflow check
int64_t required_size = (int64_t)height * srcStride;
int64_t output_size = (int64_t)height * dstStride;
printf("Width: %d, Height: %d\n", width, height);
printf("Source stride: %d, Dest stride: %d\n", srcStride, dstStride);
printf("Calculated size: %lld\n", required_size);
// Trigger overflow with large values
if (required_size > INT32_MAX || output_size > INT32_MAX) {
printf("[+] Integer overflow detected!\n");
printf("[+] This can lead to buffer overflow or crash\n");
}
}
int main() {
printf("CVE-2025-63757 PoC - FFmpeg Integer Overflow\n");
printf("===========================================\n\n");
// Test case 1: Normal values
printf("Test 1: Normal values\n");
simulate_yuv2ya16_overflow(1920, 1080, 1920, 3840);
printf("\n");
// Test case 2: Values that trigger overflow
printf("Test 2: Overflow triggering values\n");
simulate_yuv2ya16_overflow(65536, 65536, 131072, 262144);
return 0;
}
/*
* Real-world exploitation:
* 1. Create a malicious video file with crafted dimensions
* 2. Use FFmpeg to process the file
* 3. The yuv2ya16_X_c_template function will process the malformed YUV data
* 4. Integer overflow occurs in size calculations
* 5. This can lead to heap buffer overflow or denial of service
*/