CVE-2025-71373

描述

### Summary Picklescan uses `operator.methodcaller`, which is a built-in python library function to execute remote pickle files. ### Details The attack payload executes in the following steps: - First, the attacker crafts the payload by calling the `operator.methodcaller` function in method `reduce`. - Then, when the victim checks whether the pickle file is safe using the Picklescan library and this library doesn't detect any dangerous functions, they decide to use pickle.load() on this malicious pickle file, thus leading to remote code execution. ### PoC ``` import pickle import pickletools opcode1 = b'''cbuiltins __import__ (Vos tRp0 0coperator methodcaller (Vsystem Vecho "pwned by operator.methodcaller" tR(g0 tR.''' pickletools.dis(opcode1) pickle.loads(opcode1) ``` This PoC can't be easily created by pickle.dumps, therefore it was manually built. ### Impact Any organization or individual relying on picklescan to detect malicious pickle files inside PyTorch models. Attackers can embed malicious code in pickle file that remains undetected but executes when the pickle file is loaded. Attackers can distribute infected pickle files across ML models, APIs, or saved Python objects. ### Report by Pinji Chen (cpj24@mails.tsinghua.edu.cn) from the NISL lab (https://netsec.ccert.edu.cn/about) at Tsinghua University, Guanheng Liu (coolwind326@gmail.com).

如何修補 CVE-2025-71373

要修補 CVE-2025-71373,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

CVE-2025-71373 正在被利用嗎?

低 — EPSS 為 0.4%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 0.0.33

CVSS 分數

參考連結(4)

• PATCHgithub.com/mmaitre314/picklescan
• WEBgithub.com/mmaitre314/picklescan/commit/70c1c6c31beb6baaf52c8db1b6c3c0e84a6f9dab
• WEBgithub.com/mmaitre314/picklescan/pull/53
• WEBgithub.com/mmaitre314/picklescan/security/advisories/GHSA-x843-g5mx-g377