sshd is a really cool challenge that is based on the XZ Utils backdoor. I get an image that has an sshd coredump. In it, I’ll find where it crashed, in the liblzma library. I’ll reverse that to see where it is decrypting a static shellcode buffer and running it. That buffer is connecting to a TCP socket and reading off an encryption key and nonce, as well as a file path. It then reads the file at that path, encrypts it, and sends it back over the socket. I’ll use the core dump to get th...| 0xdf hacks stuff
If ssh private/public keypair authentication is failing, check the logs on the server side for permission errors. On Debian/Ubuntu check for these errors in “/var/log/auth.log”. # error if authorized_keys file has too wide a permission for others Authentication refused: bad ownership or modes for file /home/myuser/.ssh/authorized_keys # error if .ssh directory has too wide a ... Bash: fixing SSH authentication error “bad ownership or modes for file/directory”| Fabian Lee : Software Engineer