cve/2019/CVE-2019-16784.md

### [CVE-2019-16784](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-16784)
![](https://img.shields.io/static/v1?label=Product&message=PyInstaller&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-250%20Execution%20with%20Unnecessary%20Privileges&color=brighgreen)

### Description

In PyInstaller before version 3.6, only on Windows, a local privilege escalation vulnerability is present in this particular case: If a software using PyInstaller in "onefile" mode is launched by a privileged user (at least more than the current one) which have his "TempPath" resolving to a world writable directory. This is the case for example if the software is launched as a service or as a scheduled task using a system account (TempPath will be C:\Windows\Temp). In order to be exploitable the software has to be (re)started after the attacker launch the exploit program, so for a service launched at startup, a service restart is needed (e.g. after a crash or an upgrade).

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/0xT11/CVE-POC
- https://github.com/AlterSolutions/PyInstallerPrivEsc
- https://github.com/Ckrielle/CVE-2019-16784-POC
- https://github.com/developer3000S/PoC-in-GitHub
- https://github.com/hectorgie/PoC-in-GitHub