ctfworkshop-2017

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ctfworkshop-2017

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Welcome to the SkullSpace CTF workshop!

This is a list of all the levels. You can find all the files you need to complete each level in the appropriate folders. You'll be given the port number, and occasionally source files or other things you need. And sometimes hints!

You might also want to check out [FLAGS.md](FLAGS.md) to verify your flags.

And, most importantly, have a look at [PRIMER.md](PRIMER.md), which explains everything you need to know about tools, assembly, and everything else!

These are roughly ordered by difficulty, easiest to hardest.

# Easier / training challenges

These are challenges designed to teach basic CTF skills, the primary theme being writing shellcode.

## [easyauth](easyauth/)

Port: 6112

A simple web problem.

## [dontcrash](dontcrash)

Port: 6113

This is a great beginner level, simply write shellcode that doesn't crash!

## [easycap](easycap)

Port: n/a

Can you read a pcap?

## [easyreverse](easyreverse)

Port: n/a

Reverse engineer this simple program!

## [seteax](seteax) [seteax-nz](seteax-nz)

Port: 6114 (basic) and 6115 (nz)

Write some fairly simple shellcode (the -nz variation doesn't allow NUL bytes)

## [readmem](readmem) [readmem-nz](readmem-nz)

Port: 6116 (basic) and 6117 (nz)

Read the flag from a known memory address

## [writemem](writemem) [writemem-nz](writemem-nz)

Port: 6118 (basic) and 6119 (nz)

Write a special value to a known memory address

## [readstack](readstack) [readstack-nz](readstack-nz)

Port: 6120 (basic) and 6121 (nz)

Read the flag off the stack!

## [writestack](writestack) [writestack-nz](writestack-nz)

Port: 6122 (basic) and 6123 (nz)

Write a special value to the stack (without damaging the rest of the stack)

## [readfile](readfile) [readfile-nz](readfile-nz)

Port: 6124 (basic) and 6125 (nz)

Read the flag from a file on the disk

# Harder / real challenges

These are challenges from BSidesSF CTF. Some are easier, some are harder. You can find solutions if you google the name, so only do that if you're completely stuck!

## [skipper](skipper), [skipper2](skipper2)

Port: n/a

Modify a binary (on disk or in memory) to decrypt the flag

## [hashecute](hashecute)

Port: 6126

Shellcode with an MD5 prefix

## [shortest](shortest)

Port: 6127

Shellcode, in 5 bytes or less

## [b-64-b-tuff](b-64-b-tuff)

Port: 6128

Shellcode, that's base64 compatible

## [in-plain-sight](in-plain-sight)

Port: n/a

A fun little crypto problem

## [ximage](ximage)

Port: n/a

Good luck figuring out the flag! Just remember the theme. :)

## [vhash](vhash)

Port: 6129

Some reverse engineering, some crypto, and some web. Fairly difficult!

## [nibbler](nibbler)

Port: 6130

Write some game AI to build shellcode! Really

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