Rapid7

module

Java Signed Applet Social Engineering Code Execution

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Disclosed
Feb 19, 1997
Created
May 30, 2018

Description

This exploit dynamically creates a .jar file via the
Msf::Exploit::Java mixin, then signs the it. The resulting
signed applet is presented to the victim via a web page with
an applet tag. The victim's JVM will pop a dialog asking if
they trust the signed applet.

On older versions the dialog will display the value of CERTCN
in the "Publisher" line. Newer JVMs display "UNKNOWN" when the
signature is not trusted (i.e., it's not signed by a trusted
CA). The SigningCert option allows you to provide a trusted
code signing cert, the values in which will override CERTCN.
If SigningCert is not given, a randomly generated self-signed
cert will be used.

Either way, once the user clicks "run", the applet executes
with full user permissions.

Author

natron [email protected]

Platform

Java,Linux,OSX,Windows

Architectures

java, x86, ppc

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':


    msf > use exploit/multi/browser/java_signed_applet
    msf exploit(java_signed_applet) > show targets
        ...targets...
    msf exploit(java_signed_applet) > set TARGET < target-id >
    msf exploit(java_signed_applet) > show options
        ...show and set options...
    msf exploit(java_signed_applet) > exploit
Title
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