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challenges-category-Binary+Exploitation.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>
Challenges : IrisCTF 2023 - CTF fun for hackers of all skill levels
</title>
<meta content="A fun, lighthearted, and educational 48-hour online CTF aimed towards hackers of all levels. Takes place the first full Friday-to-Sunday weekend every year." name="description"/>
<meta content="" name="author"/>
<meta content="/static/img/favicon.png" property="og:image">
<link href="/static/img/favicon.png" rel="icon" type="image/png"/>
<link href="/static/theme.css-v-1.3.0r5.css" rel="stylesheet"/>
<script src="/static/theme_min.js">
</script>
</meta>
</head>
<body>
<div id="navbar">
<a href="/">
<img id="navbar-logo" src="/static/img/logo_navbar.png"/>
</a>
<div id="navbar-buttons">
<a href="/home.html">
Home
</a>
<a class="active" href="/challenges.html">
Challenges
</a>
<a href="/scoreboard.html">
Scoreboard
</a>
<a href="/profile.html">
</a>
<form action="/api" method="post">
</form>
</div>
</div>
<div id="body-content">
<div class="pre-category-name">
Challenge category:
</div>
<div class="category-name typewriter">
Binary Exploitation
</div>
<div style="display:flex; flex-wrap:wrap">
<div class="decorator-square-container" style="transform: rotate(270deg)">
<div class="decorator-square-component" style="background-color:#009927">
</div>
<div class="decorator-square-component title-decorator-gray">
</div>
<div class="decorator-square-component decorator-square-icon" style="background-image: url('/static/img/icons/arrow.png');background-size: 16px;filter:invert(1);">
</div>
</div>
<a class="btn-solid btn-solid-warning active" href="challenges-category-Binary+Exploitation.html" style="margin:0px 8px 8px 0px">
Binary Exploitation
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Cryptography.html" style="margin:0px 8px 8px 0px">
Cryptography
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Forensics.html" style="margin:0px 8px 8px 0px">
Forensics
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Miscellaneous.html" style="margin:0px 8px 8px 0px">
Miscellaneous
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Networks.html" style="margin:0px 8px 8px 0px">
Networks
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Radio+Frequency.html" style="margin:0px 8px 8px 0px">
Radio Frequency
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Reverse+Engineering.html" style="margin:0px 8px 8px 0px">
Reverse Engineering
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Web+Exploitation.html" style="margin:0px 8px 8px 0px">
Web Exploitation
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Welcome.html" style="margin:0px 8px 8px 0px">
Welcome
</a>
</div>
<div style="margin-bottom: 8px">
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-10.html">
babyseek
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
167 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
I'll let you seek around my file as far as you want, but you can't go anywhere since it's /dev/null.
</p>
<p>
<br>
</p>
<p>
To figure out where things are, you can use the
<code>
gdb
</code>
debugger. I recommend using a Docker instance, such as with the Dockerfile provided, to ensure you have an environment that matches the remote server you are attacking.
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<div href="nc seek.chal.irisc.tf 10004" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-danger btn-solid-link btn-solid-link-unclickable" style="margin-bottom:0px">
<img src="/static/img/icons/target.png" style="width:20px; height:20px; margin-right:8px">
nc seek.chal.irisc.tf 10004
</img>
</div>
</div>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060457227770671104/seek.zip" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
seek.zip
</img>
</div>
</a>
</div>
<div>
<div class="tag tag-inline">
<img src="/static/img/icons/info.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
Hint!
</b>
<p>
You can find the location of functions in the Global Offset Table by using their name followed by
<code>
@got.plt
</code>
- for example,
<code>
print &'
<a class="__cf_email__" data-cfemail="fa9c8d88938e9fba9d958ed48a968e" href="/cdn-cgi/l/email-protection.html">
[email protected]
</a>
'
</code>
.
</p>
</div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
sera
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-34.html">
ret2libm
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
392 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
I need to make a pwn? Let's go with that standard warmup rop thing... what was it... ret2libm?
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<div href="nc ret2libm.chal.irisc.tf 10001" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-danger btn-solid-link btn-solid-link-unclickable" style="margin-bottom:0px">
<img src="/static/img/icons/target.png" style="width:20px; height:20px; margin-right:8px">
nc ret2libm.chal.irisc.tf 10001
</img>
</div>
</div>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1056146650860621834/ret2libm.zip" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px"/>
ret2libm.zip
</div>
</a>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1061498899271004251/Dockerfile" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px"/>
Dockerfile
</div>
</a>
</div>
<div>
<div class="tag tag-inline">
<img src="/static/img/icons/info.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
Hint!
</b>
<p>
<strong>
The challenge server may be acting up. If your solution works locally and on the docker but not on remote, please open a ticket!
</strong>
</p>
</div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
sera
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-16.html">
baby?socat
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
478 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
I love sockets and cats and socat and
<code>
ls
</code>
</p>
<p>
<br>
</p>
<p>
Socat version on remote is
<code>
1.7.4.1
</code>
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<div href="nc socat.chal.irisc.tf 10000" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-danger btn-solid-link btn-solid-link-unclickable" style="margin-bottom:0px">
<img src="/static/img/icons/target.png" style="width:20px; height:20px; margin-right:8px">
nc socat.chal.irisc.tf 10000
</img>
</div>
</div>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1057439960187289757/socat.zip" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px"/>
socat.zip
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
sera
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-24.html">
Michael Bank
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
494 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
This is Michael's bank. You can't break into it, it's just impossible.
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<div href="nc michaelbank.chal.irisc.tf 10003" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-danger btn-solid-link btn-solid-link-unclickable" style="margin-bottom:0px">
<img src="/static/img/icons/target.png" style="width:20px; height:20px; margin-right:8px">
nc michaelbank.chal.irisc.tf 10003
</img>
</div>
</div>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060743193441873930/Program.cs" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px"/>
Program.cs
</div>
</a>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060743194008096838/currency_conversion.txt" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px"/>
currency_conversion.txt
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
nope
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-17.html">
Infinite Descent
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
500 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
At the end lies your flag.
</p>
<p>
<br>
</p>
<p>
Updated distribution file: added Dockerfile and run script
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<div href="nc infinitedescent.chal.irisc.tf 10002" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-danger btn-solid-link btn-solid-link-unclickable" style="margin-bottom:0px">
<img src="/static/img/icons/target.png" style="width:20px; height:20px; margin-right:8px">
nc infinitedescent.chal.irisc.tf 10002
</img>
</div>
</div>
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1061333718226182274/infinitedescent.zip" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px"/>
infinitedescent.zip
</div>
</a>
</div>
<div>
<div class="tag tag-inline">
<img src="/static/img/icons/info.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
Hint!
</b>
<p>
How is memory laid out in the binary that's very different than a non-embedded binary? Also if you're scared of the qemu, it might help to know you can debug the binary with the
<code>
-s -S
</code>
flags and gdb-multiarch.
</p>
</div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
sera
</div>
</div>
</div>
</div>
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<a href="https://github.com/Milkdrop/CTFx">
CTFx
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