CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
5.1%
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.
[
{
"vendor": "pyinstaller",
"product": "pyinstaller",
"versions": [
{
"version": "< 5.13.1",
"status": "affected"
}
]
}
]
github.com/pyinstaller/pyinstaller/pull/7827
github.com/pyinstaller/pyinstaller/security/advisories/GHSA-9w2p-rh8c-v9g5
github.com/python/cpython/blob/0fb18b02c8ad56299d6a2910be0bab8ad601ef24/Lib/shutil.py#L623
lists.fedoraproject.org/archives/list/[email protected]/message/2K2XIQLEMZIKUQUOWNDYWTEWYQTKMAN7/
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