Introduction
In this level of the OverTheWire Bandit challenges, we'll learn how to scan for open ports and establish an SSL connection to retrieve the flag for the next level.
Previous Flag
Flag: JQttfApK4SeyHwDlI9SXGR50qclOAil1
Step 1: Scanning for Open Ports
Begin by using the nmap command to scan for open ports on the local machine. We're particularly interested in ports within the range of 31000 to 32000.
nmap -vvv -p 31000-32000 -Pn -n localhost
The output will identify which of these ports are open and may provide additional details about the services running on them.
Step 2: Scanning Specific Ports
After identifying open ports, proceed to scan specific ports for additional information. We'll use the nmap command again with specific ports: 31046, 31518, 31691, 31790, and 31960. We'll also include service and script scanning for comprehensive information.
nmap -p31046,31518,31691,31790,31960 -vvv -sC -sV -n -Pn localhost --min-rate=5000
This command will provide detailed information about the services running on these ports.
Step 3: Establishing an SSL Connection
Once we identify that port 31790 is open with an openSSL service running on it, we will use the openssl command to establish an SSL connection to that port:
openssl s_client localhost:31790
This will initiate an SSL/TLS session, and the login flag for the next level will be displayed as an RSA key:
-----BEGIN RSA PRIVATE KEY-----
MIIEogIBAAKCAQEAvmOkuifmMg6HL2YPIOjon6iWfbp7c3jx34YkYWqUH57SUdyJ
imZzeyGC0gtZPGujUSxiJSWI/oTqexh+cAMTSMlOJf7+BrJObArnxd9Y7YT2bRPQ
Ja6LLzb558YW3FZl87ORiO+rW4LCDCNd2lUvLE/GL2GWyuKN0K5iCd5TbtJzEkQTu
DSt2mcNn4rhAL+JFr56o4T6z8WWAW18BR6yGrMq7Q/kALHYW3OekePQAzL0VUYbW
JGTi65CxbCnzc/w4+mqQyvmzpWtMAzJTzAzQxNbkR2MBGySxDLrjg0LWN6sK7wNX
x0YVztz/zbIkPjfkU1jHS+9EbVNj+D1XFOJuaQIDAQABAoIBABagpxpM1aoLWfvD
KHcj10nqcoBc4oE11aFYQwik7xfW+24pRNuDE6SFthOar69jp5RlLwD1NhPx3iBl
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8c8hAuRBb2G82so8vUHk/fur85OEfc9TncnCY2crpoqsghifKLxrLgtT+qDpfZnx
SatLdt8GfQ85yA7hnWWJ2MxF3NaeSDm75Lsm+tBbAiyc9P2jGRNtMSkCgYEAypHd
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dxviW8+TFVEBl1
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