7-Zip 16.02 DLL Hijacking

Risk: Medium
Local: Yes
Remote: No

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 >, <http://blog.acrossecurity.com/2012/02/downloads-folder-binary-planting.html > and <http://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 http://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!!

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