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RevSuit - A Flexible and Powerful Reverse Connection Platform

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Overview

RevSuit is a flexible and powerful reverse connection platform designed for receiving connection from target host in penetration. It currently supports HTTP, DNS, RMI, LDAP, MySQL and FTP protocols.

Flexible:

  1. RevSuit can set flexible rules to capture different connections.
  2. Deploy and run via binaries without worrying about nasty dependency errors.

Powerful:

  1. Allows to customize the response for different connections through rules and supports dynamic response generation using template variables.
  2. Support a variety of protocols, and support the in-depth utilization of some protocols, such as DNS rebinding, MySQL Load Local Data, JDBC Deserialize Exploit, FTP Passive Mode SSRF, etc.
  3. Native support for use with scanners.
  4. Support push notifications to popular office software.
  5. Other thoughtful and detailed features.

Basic Usage

Installation and Configuration

Download the latest release directly or build by following steps:

git clone https://github.com/Li4n0/revsuit.git
cd revsuit/frontend && yarn install && yarn build
cd ../ && go build ./cmd/revsuit/revsuit.go

RevSuit will generate default configuration file on first run. Modify the configuration file according to your needs, then re-run. A detailed description of the configuration file can be found at: Configuration Notes

Run

In order to confirm the IP location, it needs to use the IP location database. QQwry is used as the data source by default, you can also modify the configuration to use GeoIP. If the selected database is not available in the current directory or the database is updated for more than a week, RevSuit will automatically download the latest database. If the download fails, the IpArea field will always be null.

$ ./revsuit   
2021/05/16 22:55:10 [ INFO] Downloading qqwry.dat...

    ____            _____       _ __ 
   / __ \___ _   __/ ___/__  __(_) /_
  / /_/ / _ \ | / /\__ \/ / / / / __/
 / _, _/  __/ |/ /___/ / /_/ / / /_  
/_/ |_|\___/|___//____/\__,_/_/\__/    
                                   vBeta0.1
     https://revsuit.pro
2021/05/16 22:55:22 [ INFO] Starting HTTP Server at :80, token:your_token
2021/05/16 22:55:22 [ INFO] Start to listen FTP PASV port at :2020, PasvIP is 10.9.8.7
2021/05/16 22:55:22 [ INFO] Starting FTP Server at :21
2021/05/16 22:55:22 [ INFO] Starting MySQL Server at :3306
2021/05/16 22:55:22 [ INFO] Starting RMI Server at :1099
2021/05/16 22:55:22 [ INFO] Starting DNS Server at :53

After running, you can visit the /revsuit/admin/ path of HTTP Server and enter the token to access the control panel.

Create Rules and Receive Connection

Take the creation of HTTP rules as an example:

A few notes are as follows：

  1. The name and flagFormat of rule are unique.
  2. FlagFormat uses regular expression syntax, and for different protocols, the fields matched by flagFormat are different, you can check the corresponding hints to get details when creating rules.
  3. Rules with high rank will take effect first.
  4. For different protocol rules, you can make different custom responses, and for some protocols, template variables can be used.
  5. You can set the named grouping of regular expressions in flagFormat, and the result of the matching grouping will also be used as a template variable.

As shown below, we create a rule that uses the built-in template variables and custom template variables of the http protocol, and names it test_create_rule:

img.png

Then make a request that satisfies the rule and view the response.

img.png

The request will be logged on the platform at the same time.

img.png

Notice

If you want to be notified of new connections on your office software, you can configure the webhook address of the relevant software in the configuration file and turn on the Notice switch for the corresponding rule. Only support to four software types currently: dingtalk,wechat,lark,slack.(Discord and telegram support is in the plan.)

Import/Export Rules

If you're migrating platforms or purging data, it can be a hassle to recreate rules. That's why the platform supports import and export of rules.

The entry point for this function is located at Settings>RULES.

The rules are stored in yaml format for import and export, like the following:

http:
  - name: test_create_rule
    flag_format: (?P<what>\w+)\?
    rank: 0
    push_to_client: false
    notice: false
    response_status_code: "302"
    response_headers:
      Location: ${query.url}
    response_body: ${header.say} ${what}
  - name: other_rule
    flag_format: other
    rank: 1
    push_to_client: false
    notice: true
    response_status_code: "200"
    response_headers: { }
    response_body: Hello Revsuit!
dns:
  ... ...

Advance Usage

Use with Scanner

RevSuit was split from my scanner project, so its native support works with scanners.

From RevSuit's perspective, we call a scanner a client.

Establish connection

RevSuit uses HTTP Server-sent Events (SSE) to establish a one-way communication channel with the client.

The API for the channel is: /revsuit/api/events?message .The client first needs to add the Token: your token header to the Header, and then access the API to establish the channel. When the platform receives a new connection, the flag captured by the rule will be passed to the client through this channel. img.png

Here is a simple demo using Golang's sse library as an example.

Multi-client

As shown above, RevSuit supports multiple clients, and each client in the connected state receives a push of flag, so distributed scanning can be supported.

If you don't want every client to receive all flag pushes, you can use the Flag-Filter request header when creating an sse connection to set the format(regular expressions) of the flag you want that client to receive:

img.png

Temporary storage queue

RevSuit will store flag temporarily in the queue when there is no client connection and send it when the client connects, so you don't have to worry about missing the vulnerability because the client disconnects. (This is especially helpful for discovering delay-triggered vulnerabilities.)

Use flagGroup

In a real-world vulnerability scanning scenario, you may send a large number of different payloads for a single vulnerability point, and they may all be valid, which can result in the backlink platform receiving many requests, yet they are caused by the same vulnerability. If you don't want the client to receive so many flags for the same vulnerability, you can take advantage of the flagGroup feature of rule's flagFormat.

FlagGroup is the content matched by the anonymous group in the flagFormat field of the rule. The platform will check the content matched in the grouping,and the flag is only pushed to the client when then content(flagGroup) captured for the first time.

For example, SSRF scanning.

Firstly create a rule like the following:

http:
  - name: ssrf
    flag_format: (ssrf[a-z0-9]{6})[0-9]{1,3}
    rank: 0
    push_to_client: false
    notice: false
    response_status_code: "200"
    response_headers: { }
    response_body: "Here is a SSRF!"

Suppose our target is https://www.testvuln.com?url=api.com&p=useless, and for SSRF we have 5 payloads. The final request sent by the scanner may be ['https://www.testvuln.com?url=http://revsuit.com/ssrfa98oni1&p=useless','https://www.testvuln.com?url=http://revsuit.com/ssrfa98oni2&p=useless', ... ,'https://www.testvuln.com?url=//revsuit.com/ssrfa98oni5&p=useless'] . They may all attack successfully.

However, because anonymous grouping is used in the rule's flagFormat, The platform will query the connected flagGroup, in this case ssrfa98oni, and push flag to the client only at its first appearance, so the client will only receive one flag:ssrfa98oni1. It already proves that the url parameter of the target is vulnerable.

Multi-module collocation

In actual penetration testing scenarios, certain tasks can be done easily and quickly by combining and matching various modules of RevSuit. The following is an example of a blind XXE in Java Web, showing how to use RevSuit's HTTP and FTP modules, combined with template variables, to quickly complete a port scan.

First create an HTTP rule to return evil.dtd, customize the response to the contents of dtd so that it goes to connect to RevSuit's FTP service, and use template variables to pass the Host and Port to be scanned to FTP via FTP's user and password.

create evil.dtd rule

Then create an FTP rule that receives the Host and port to be scanned from the user and password template variables, set to Pasv Address.

create ftp scan rule

Then use BurpSuit to launch the scan, by setting the host and port parameters in the evil.dtd URL to set the target of the port scan.

xxe

The running effect is as follows:

ftp-scan

It because the FTP connection will be crashed if Passive Address is not accessible, we can determine whether the port is open or not based on whether the connection exits normally.For this example, we successfully detected that port 8005 and 8080 are open.

More Usage

A more detailed wiki is being prepared, you can explore by yourself before it.

Feedback, Suggestions and Communication

Submit an issue or contact me through Weixin: TGk0bjA2Cg==

Acknowledgements

Reference

This project draws on the code of the following outstanding projects:

Specifically

Thanks to my friend @E99p1ant for all the help and advice I received during the development of this project.

License

@Apache License 2.0