cve/2023/CVE-2023-49797.md

### [CVE-2023-49797](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-49797)
![](https://img.shields.io/static/v1?label=Product&message=pyinstaller&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3C%205.13.1%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-379%3A%20Creation%20of%20Temporary%20File%20in%20Directory%20with%20Insecure%20Permissions&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-732%3A%20Incorrect%20Permission%20Assignment%20for%20Critical%20Resource&color=brighgreen)

### Description

PyInstaller bundles a Python application and all its dependencies into a single package. A PyInstaller built application, elevated as a privileged process, may be tricked by an unprivileged attacker into deleting files the unprivileged user does not otherwise have access to. A user is affected if **all** the following are satisfied: 1. The user runs an application containing either `matplotlib` or `win32com`. 2. The application is ran as administrator (or at least a user with higher privileges than the attacker). 3. The user's temporary directory is not locked to that specific user (most likely due to `TMP`/`TEMP` environment variables pointing to an unprotected, arbitrary, non default location). Either: A. The attacker is able to very carefully time the replacement of a temporary file with a symlink. This switch must occur exactly between `shutil.rmtree()`'s builtin symlink check and the deletion itself B: The application was built with Python 3.7.x or earlier which has no protection against Directory Junctions links. The vulnerability has been addressed in PR #7827 which corresponds to `pyinstaller >= 5.13.1`. Users are advised to upgrade. There are no known workarounds for this vulnerability.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/fkie-cad/nvd-json-data-feeds