pyinstaller up to 5.13.0 Temporary Directory shutil.rmtree permission assignment

Summaryinfo

A vulnerability classified as critical was found in pyinstaller up to 5.13.0. Affected by this vulnerability is the function shutil.rmtree of the component Temporary Directory Handler. Executing a manipulation can lead to permission assignment. The identification of this vulnerability is CVE-2023-49797. The attack can only be executed locally. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in pyinstaller up to 5.13.0 and classified as critical. This vulnerability affects the function shutil.rmtree of the component Temporary Directory Handler. The manipulation with an unknown input leads to a permission assignment vulnerability. The CWE definition for the vulnerability is CWE-732. The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was shared 12/09/2023 as GHSA-9w2p-rh8c-v9g5. The advisory is shared for download at github.com. This vulnerability was named CVE-2023-49797 since 11/30/2023. There are known technical details, but no exploit is available.

Upgrading to version 5.13.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• pyinstaller

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13.0

Website

• Product: https://github.com/pyinstaller/pyinstaller/

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CPE 2.2info

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