Leaked debug logs suggest the flaw resides in the crypto_ssh_kex_cisco_int function—a proprietary Cisco enhancement to the SSH key exchange that handles legacy KEX algorithms (e.g., diffie-hellman-group-exchange-sha1 ).
leak = s.recv(1024) if b"enable secret" in leak: print("[!] Memory leak contains credential hash!") print(leak[leak.find(b"enable"):leak.find(b"enable")+256])
banner = s.recv(1024) print(f"Banner: banner") ssh20cisco125 vulnerability exclusive
To patch the vulnerability, you can use a tool like Ansible to automate the process. Here's an example playbook:
for a specific version of Cisco IOS you are currently running? Leaked debug logs suggest the flaw resides in
Never allow SSH daemons to listen openly to unauthenticated interfaces. Harden your lines by attaching an access-class control scheme: line vty 0 4 transport input ssh access-class 10 in Use code with caution. 3. Deploy Platform-Specific Workarounds
This flaw fundamentally breaks the security model of public-key cryptography on affected devices. It allows a remote, unauthenticated attacker to log in to a device by bypassing the requirement for a private SSH key. Never allow SSH daemons to listen openly to
An attacker could exploit this by continuously connecting to an affected device and sending specially crafted SSH requests. A successful exploit causes the device to reload unexpectedly
