Aloha,

*7z1602-x64**.exe* loads and executes dll from its "application directory".

For software downloaded with a web browser the applicationdirectory is
typically the user's "Downloads" directory: see <
https://insights.sei.cmu.edu/cert/2008/09/carpet-bombing-and-directory-poisoning.html
>,
<https://blog.acrossecurity.com/2012/02/downloads-folder-binary-planting.html
>
and <https://seclists.org/fulldisclosure/2012/Aug/134> for "prior art" about
this well-known and well-documented vulnerability.


If an attacker places one of the above named DLL in the user's "Downloads"
directory (for example per "drive-by download" or "social engineering")
this vulnerability becomes a remote code execution.


Proof of concept/demonstration:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1. Create a malicious dll file and save it in your "Downloads" directory.

2. Download 7z1602-x64.exe from https://www.7-zip.org/
 and save it in your "Downloads" directory.

3. Execute 7z1602-x64.exe from your "Downloads" directory.

4. Malicious dll file gets executed.

Chao!!