Apache mod_isapi Dangling Pointer - Metasploit


This page contains detailed information about how to use the auxiliary/dos/http/apache_mod_isapi metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
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Module Overview

Name: Apache mod_isapi Dangling Pointer
Module: auxiliary/dos/http/apache_mod_isapi
Source code: modules/auxiliary/dos/http/apache_mod_isapi.rb
Disclosure date: 2010-03-05
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 80
List of CVEs: CVE-2010-0425

This module triggers a use-after-free vulnerability in the Apache Software Foundation mod_isapi extension for versions 2.2.14 and earlier. In order to reach the vulnerable code, the target server must have an ISAPI module installed and configured. By making a request that terminates abnormally (either an aborted TCP connection or an unsatisfied chunked request), mod_isapi will unload the ISAPI extension. Later, if another request comes for that ISAPI module, previously obtained pointers will be used resulting in an access violation or potentially arbitrary code execution. Although arbitrary code execution is theoretically possible, a real-world method of invoking this consequence has not been proven. In order to do so, one would need to find a situation where a particular ISAPI module loads at an image base address that can be re-allocated by a remote attacker. Limited success was encountered using two separate ISAPI modules. In this scenario, a second ISAPI module was loaded into the same memory area as the previously unloaded module.

Module Ranking and Traits

Module Ranking:

  • normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.

Basic Usage

msf > use auxiliary/dos/http/apache_mod_isapi
msf auxiliary(apache_mod_isapi) > show targets
    ... a list of targets ...
msf auxiliary(apache_mod_isapi) > set TARGET target-id
msf auxiliary(apache_mod_isapi) > show options
    ... show and set options ...
msf auxiliary(apache_mod_isapi) > exploit

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 dos/http/apache_mod_isapi auxiliary module looks in the msfconsole:

msf6 > use auxiliary/dos/http/apache_mod_isapi

msf6 auxiliary(dos/http/apache_mod_isapi) > show info

       Name: Apache mod_isapi Dangling Pointer
     Module: auxiliary/dos/http/apache_mod_isapi
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2010-03-05

Provided by:
  Brett Gervasoni
  jduck <[email protected]>

Check supported:
  No

Basic options:
  Name    Current Setting        Required  Description
  ----    ---------------        --------  -----------
  ISAPI   /cgi-bin/SMTPSend.dll  yes       ISAPI URI to request
  RHOSTS                         yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT   80                     yes       The target port (TCP)

Description:
  This module triggers a use-after-free vulnerability in the Apache 
  Software Foundation mod_isapi extension for versions 2.2.14 and 
  earlier. In order to reach the vulnerable code, the target server 
  must have an ISAPI module installed and configured. By making a 
  request that terminates abnormally (either an aborted TCP connection 
  or an unsatisfied chunked request), mod_isapi will unload the ISAPI 
  extension. Later, if another request comes for that ISAPI module, 
  previously obtained pointers will be used resulting in an access 
  violation or potentially arbitrary code execution. Although 
  arbitrary code execution is theoretically possible, a real-world 
  method of invoking this consequence has not been proven. In order to 
  do so, one would need to find a situation where a particular ISAPI 
  module loads at an image base address that can be re-allocated by a 
  remote attacker. Limited success was encountered using two separate 
  ISAPI modules. In this scenario, a second ISAPI module was loaded 
  into the same memory area as the previously unloaded module.

References:
  https://nvd.nist.gov/vuln/detail/CVE-2010-0425
  OSVDB (62674)
  http://www.securityfocus.com/bid/38494
  https://issues.apache.org/bugzilla/show_bug.cgi?id=48509
  http://www.gossamer-threads.com/lists/apache/cvs/381537
  http://www.senseofsecurity.com.au/advisories/SOS-10-002
  https://www.exploit-db.com/exploits/11650

Module Options

This is a complete list of options available in the dos/http/apache_mod_isapi auxiliary module:

msf6 auxiliary(dos/http/apache_mod_isapi) > show options

Module options (auxiliary/dos/http/apache_mod_isapi):

   Name    Current Setting        Required  Description
   ----    ---------------        --------  -----------
   ISAPI   /cgi-bin/SMTPSend.dll  yes       ISAPI URI to request
   RHOSTS                         yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT   80                     yes       The target port (TCP)

Advanced Options

Here is a complete list of advanced options supported by the dos/http/apache_mod_isapi auxiliary module:

msf6 auxiliary(dos/http/apache_mod_isapi) > show advanced

Module advanced options (auxiliary/dos/http/apache_mod_isapi):

   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
   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

Auxiliary Actions

This is a list of all auxiliary actions that the dos/http/apache_mod_isapi module can do:

msf6 auxiliary(dos/http/apache_mod_isapi) > show actions

Auxiliary actions:

   Name  Description
   ----  -----------

Evasion Options

Here is the full list of possible evasion options supported by the dos/http/apache_mod_isapi auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(dos/http/apache_mod_isapi) > 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:

Authors

  • Brett Gervasoni
  • jduck

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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