vulnserver-exploits

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vulnserver-exploits

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Vulnserver exploits

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// repository documentation

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# Vulnserver: Fuzzing and Exploits

OS: Windows 7 SP1 version 6.1 (32 bits). All of them work (TRUN and GTER *socket reuse* scripts must be updated).

## Exploits

GMON

- Vanilla Buffer Overflow

GTER

- Egghunter

- Socket reuse (*buf* variable must be updated, check notes)

HTER

- Hexadecimal encoding Buffer Overflow

KSTET

- Egghunter

- Socket reuse

LTER

- SEH (bypassing ASLR)

TRUN

- Vanilla Buffer Overflow

- Socket reuse (*buf* variable must be updated, check notes)

--------------------------------------------------------------------------------------------------------

## Fuzzing with Peach

1. Start Peach

```
C:\> peach.exe -a tcp
```

![Screenshot](https://i.imgur.com/BtTm27l.png)

2. Run the "vulnserver.xml" Peach file and test the command you want:

```
C:\> peach.exe vulnserver.xml TestKSTET
```

![Screenshot](https://i.imgur.com/pPbw2aP.png)

## Fuzzing with Boofuzz

1. Run the "vulnserver_boofuzz.py" Boofuzz file and test the command you want:

```
python vulnserver_boofuzz.py 192.168.112.145 9999 TRUN
```

2. Attach the process to OllyDbg to check when and how it crashes

--------------------------------------------------------------------------------------------------------

## Installation

Vulnserver:

- Download Vulnserver from https://github.com/stephenbradshaw/vulnserver

Ollydbg:

- Download OllyDbg from http://www.ollydbg.de/odbg110.zip

Peach (optional):

- Download and install .NET 4 from https://www.microsoft.com/en-us/download/details.aspx?id=17851

- Download and install Windows SDK from https://www.microsoft.com/en-us/download/details.aspx?id=8279

- Download Peach from https://sourceforge.net/projects/peachfuzz/

Boofuzz (optional)([[docs](https://buildmedia.readthedocs.org/media/pdf/boofuzz/latest/boofuzz.pdf)]):

- *pip install boofuzz*

--------------------------------------------------------------------------------------------------------

## References

Fuzzing with Peach:

http://www.rockfishsec.com/2014/01/fuzzing-vulnserver-with-peach-3.html

https://sh3llc0d3r.com/fuzzing-vulnserver-with-peach/

KSTET Socket reuse

https://deceiveyour.team/2018/10/15/vulnserver-kstet-ws2_32-recv-function-re-use/

https://rastating.github.io/using-socket-reuse-to-exploit-vulnserver/

GTER Socket reuse

https://www.absolomb.com/2018-07-24-VulnServer-GTER/

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