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LNK Code Execution Vulnerability

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LNK Code Execution Vulnerability

Disclosed
06/13/2017
Created
06/14/2018

Description

This module exploits a vulnerability in the handling of Windows Shortcut files (.LNK) that contain a dynamic icon, loaded from a malicious DLL. This vulnerability is a variant of MS15-020 (CVE-2015-0096). The created LNK file is similar except an additional SpecialFolderDataBlock is included. The folder ID set in this SpecialFolderDataBlock is set to the Control Panel. This is enough to bypass the CPL whitelist. This bypass can be used to trick Windows into loading an arbitrary DLL file. The PATH option must be an absolute path to a writeable directory which is indexed for searching. If no PATH is specified, the module defaults to %USERPROFILE%.

Author(s)

  • Uncredited
  • Yorick Koster
  • Spencer McIntyre

Platform

Windows

Architectures

x86, x64

Development

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/windows/local/cve_2017_8464_lnk_lpe
msf exploit(cve_2017_8464_lnk_lpe) > show targets
    ...targets...
msf exploit(cve_2017_8464_lnk_lpe) > set TARGET < target-id >
msf exploit(cve_2017_8464_lnk_lpe) > show options
    ...show and set options...
msf exploit(cve_2017_8464_lnk_lpe) > exploit

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