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Linux BSD-derived Telnet Service Encryption Key ID Buffer Overflow

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Linux BSD-derived Telnet Service Encryption Key ID Buffer Overflow

Disclosed
12/23/2011
Created
05/30/2018

Description

This module exploits a buffer overflow in the encryption option handler of the Linux BSD-derived telnet service (inetutils or krb5-telnet). Most Linux distributions use NetKit-derived telnet daemons, so this flaw only applies to a small subset of Linux systems running telnetd.

Author(s)

  • Jaime Penalba Estebanez <jpenalbae@gmail.com>
  • Brandon Perry <bperry.volatile@gmail.com>
  • Dan Rosenberg
  • hdm <x@hdm.io>

Platform

Linux

Development

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/linux/telnet/telnet_encrypt_keyid
msf exploit(telnet_encrypt_keyid) > show targets
    ...targets...
msf exploit(telnet_encrypt_keyid) > set TARGET < target-id >
msf exploit(telnet_encrypt_keyid) > show options
    ...show and set options...
msf exploit(telnet_encrypt_keyid) > exploit

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security

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