vulnserver | Vulnerable server used for learning software exploitation | Hacking library

by stephenbradshaw C Version: Current License: BSD-3-Clause

X-Ray Key Features Code Snippets Community Discussions(3)Vulnerabilities Install Support

kandi X-RAY | vulnserver Summary

vulnserver is a C library typically used in Security, Hacking applications. vulnserver has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Vulnserver is a multithreaded Windows based TCP server that listens for client connections on port 9999 (by default) and allows the user to run a number of different commands that are vulnerable to various types of exploitable buffer overflows. This software is intended mainly as a tool for learning how to find and exploit buffer overflow bugs, and each of the bugs it contains is subtly different from the others, requiring a slightly different approach to be taken when writing the exploit. Though it does make an attempt to mimic a (simple) legitimate server program this software has no functional use beyond that of acting as an exploit target, and this software should not generally be run by anyone who is not using it as a learning tool.

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Quality

Security

License

Reuse

Support

vulnserver has a medium active ecosystem.

It has 851 star(s) with 231 fork(s). There are 28 watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 3 have been closed. On average issues are closed in 28 days. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of vulnserver is current.

Quality

vulnserver has 0 bugs and 0 code smells.

Security

vulnserver has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

vulnserver code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

vulnserver is licensed under the BSD-3-Clause License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

vulnserver releases are not available. You will need to build from source code and install.

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vulnserver Key Features

No Key Features are available at this moment for vulnserver.

vulnserver Examples and Code Snippets

No Code Snippets are available at this moment for vulnserver.

Community Discussions

Trending Discussions on vulnserver

Buffer Overflow Not working in Windows 7 x64?

Python cannot find substring that I can see in EIP overflow

Python script generating file with exploit code - unicodeescape unicode error

QUESTION

Buffer Overflow Not working in Windows 7 x64?

Asked 2019-Nov-27 at 14:54

I previously had exploited buffer overflows in Linux, have decent knowledge on how|why it happens, protections against it(ASLR,DEP).

Recently came to try it in windows, so first google search shows to exploit vulnserver's TRUN command, URL: https://github.com/stephenbradshaw/vulnserver based on my research, in windows you can't disable ASLR but can disable DEP for programs through Data Execution Prevention or https://community.ipswitch.com/s/article/Understanding-Data-Execution-Prevention-in-Windows-1307565976900

Before jumping to my script, below is the Immunity Debugger's parts after executing my exploit:

Portion of stack:

...

ANSWER

Answered 2019-Aug-03 at 21:06

Have to answer my own question for others who face the same problem as me

My shell code was for x86 bit architecture, below is for a All Windows calculator shellcode which worked for me.

Source https://stackoverflow.com/questions/57335109

QUESTION

Python cannot find substring that I can see in EIP overflow

Asked 2019-Apr-17 at 09:13

I have a script that I am using to automate and understand application fuzzing. I am running vulnserver and fuzzing to find the point at which the stack is overflowed and then generate a unique string that will then be sent again to locate at what point the EIP is being overwritten.

The issue that I have is that I have determined that the overflow happens when the initial set 2100 of As are sent. From there I am generating a string of sequential characters with the script below, an excerpt...

...

ANSWER

Answered 2019-Apr-17 at 09:13

So I figured out what the issue was. Obviously the EIP value was little endian. Because of that, all I had to do was reverse the produced string and that solved my issue.

Basic PICNIC error!

Source https://stackoverflow.com/questions/55657458

QUESTION

Python script generating file with exploit code - unicodeescape unicode error

Asked 2017-Jan-16 at 15:13

I'm writing a script that should generate a file for exploiting the Vulnserver.

Everything appears to be fine, but then I added the shellcode and now I run into a unicode error (unicodeescape).

...

ANSWER

Answered 2017-Jan-16 at 15:13

Every hex code need two digits but you have \x2 at the end of first line - and this makes your problem. I don't know maybe it has to be \x02

You have also \xa at the end of other line - maybe you need \x0a

Python treats this as text in UNICODE and tries to convert to bytes using CP1252 (Code Page 1252)

Better use bytes - add prefix b to all text. And save in file with wb

Source https://stackoverflow.com/questions/41678880

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install vulnserver

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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