module

Firefox 5.0 - 15.0.1 __exposedProps__ XCS Code Execution

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Disclosed
2013-08-06
Created
2018-05-30

Description

On versions of Firefox from 5.0 to 15.0.1, the InstallTrigger global, when given
invalid input, would throw an exception that did not have an __exposedProps__
property set. By re-setting this property on the exception object's prototype,
the chrome-based defineProperty method is made available.

With the defineProperty method, functions belonging to window and document can be
overridden with a function that gets called from chrome-privileged context. From here,
another vulnerability in the crypto.generateCRMFRequest function is used to "peek"
into the context's private scope. Since the window does not have a chrome:// URL,
the insecure parts of Components.classes are not available, so instead the AddonManager
API is invoked to silently install a malicious plugin.

Authors

Mariusz Mlynski
moz_bug_r_a4
joev joev@metasploit.com

Platform

Java,Linux,OSX,Solaris,Windows

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/firefox_proto_crmfrequest
    msf exploit(firefox_proto_crmfrequest) > show targets
        ...targets...
    msf exploit(firefox_proto_crmfrequest) > set TARGET < target-id >
    msf exploit(firefox_proto_crmfrequest) > show options
        ...show and set options...
    msf exploit(firefox_proto_crmfrequest) > exploit
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