Security aspects concerning code written in the programming language PHP which is often used for web applications.

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27
votes
3answers
8k views

How does “check.torproject.org.” know if you're using TOR?

I'm looking at the results from the following URL and would like to know how does the TOR website "know" that TOR is being used or not. ...
2
votes
1answer
1k views

ALERT - ASCII-NUL chars not allowed within request variables

In a Drupal site, I get this error in my Debian's syslog: suhosin[9413]: ALERT - ASCII-NUL chars not allowed within request variables - dropped variable 'name' (attacker 'x.x.x.x', file ...
5
votes
3answers
205 views

Can I limit PHP include() to specific directory trees?

I know I can use the php.ini open_basedir directive to limit the directory trees where files can be opened by PHP. But in a directory structure such as this: ├── application │   ├── index.php │   ...
2
votes
2answers
1k views

Is $_REQUEST['id'] vulnerable to sql injection

I have the code below in my newsview.php.I want to know why the code below vulnerable to sql injection.I already test the sql injection in the code below. $id = intval($_REQUEST['id']); $result = ...
3
votes
3answers
515 views

Tokenless REST API security concerns

I'm designing an API in PHP/MySQL that, by its design, will not store a user's password in the database and thus does not generate authorization tokens for the client to hold. The reason for this is ...
1
vote
4answers
4k views

SQL injection with “INSERT” statement

I am currently studying the most basic SQL injections that are possible. Pure and solely for the purpose of teaching myself the basics before advancing to more advanced ones. I am recreating this ...
15
votes
4answers
2k views

What are the security threats of zip file uploads and what preventive actions should be taken?

We have a Drupal application developed for sharing files. We are allowing zip files to be uploaded by logged in departmental user. We are using Drupal private file system (outside webroot). We are ...
1
vote
3answers
317 views

Pentesting my Own Server File Upload

I recently created my own IIS server (set on version 7.5) and I was going through checks to make sure my webdav is not vulnerable. My users need to upload files to their individual accounts and can ...
0
votes
0answers
23 views

IIS 7.5 WebDav with Student Security [duplicate]

Hello Currently I am setting up a server for college students (this includes tech-savy IT students as well) and I will be using IIS 7.5 with Webdav for the students to access their files from home. ...
4
votes
3answers
2k views

Is it possible for a hacker to bypass upload php file?

I wanna give a filtering system in my script. here it is : <?php $allowedExts = array("gif", "jpeg", "jpg", "png","bmp"); $temp = explode(".", $_FILES["file"]["name"]); $extension = end($temp); ...
9
votes
4answers
535 views

How can I be secure with a global salt?

If I understood the basic of password hashing and storing, what we need are: a "strong" salt a "real" random salt a unique salt per password a password hashing function with a high CPU cost We ...
2
votes
0answers
331 views

how to prevent ASCII Encoded / Binary String SQL injection in Codeigniter

I am using CodeIgniter for two years and I am digging into penetration testing nowadays. I think that ActiveRecord does good job for preventing sql injections, but i have following questions: I want ...
2
votes
1answer
264 views

Communicate between two sites both with SSL

I now have two websites - site A and B, both with SSL-certificate, and they have exact same users. So when a user log into site A and click the link to site B, I want to make him auto log in to site ...
0
votes
2answers
881 views

Google Authenticator - Counter Based [duplicate]

I'm trying to understand How google authenticator - counter based work. I have tried googling around finding a demo or at least how this work. I understand its a one time password but not like TOTP. I ...
1
vote
0answers
35 views

Removing PHP Shell from server [duplicate]

I have looked at a few other questions related to this but nothing specifically answered what I was wondering about. Say for example you have a server that is infected with a php shell such as c99. ...
10
votes
3answers
429 views

has scrypt withstood the test of time?

I've always heard that scrypt was better than bcrpyt... because of memory causing GPU a very difficult time to crack. However, the notion always was that scrypt hadn't been tested, it was kind of a ...
5
votes
3answers
6k views

Testing PHP form injection

I'm writing a very small PHP app that takes input via a form. As could be expected for a first revision, the code does no escaping or sanitisation of input: if( $_POST["var"] != "" ) { print ...
1
vote
1answer
755 views

Why: Default salt and cipher seed value at Cake PHP Framework?

I am wondering, why in cake php framework, they include default values for this variable: salt cipher seed I found these default values while doing application review (white box approach). And I ...
5
votes
1answer
367 views

Web Applications terminate strings on null-byte

I have just been doing some penetration testing on a site, and I have noticed (and I have noticed before but now seems like a good point to bring it up) that putting a null byte in the search string ...
1
vote
1answer
209 views

PHP gethostbyname security implications

I'm working on a PHP application. There is a requirement to find IP's by hostname and i have to resort to gethostbynamel for that. Looks like there is no other way. I was wondering if there are any ...
3
votes
1answer
102 views

How can I migrate from filter-on-output to filter-on-input?

I recently joined a company with a million+ lines-of-code PHP app. The security approach to XSS appears to be to filter output whenever the dev thought of it. Not surprisingly, they didn't catch ...
1
vote
1answer
214 views

Edit virtual host file using php [closed]

I have a php application and somethings related to the application need changes to vhost.conf file. Presently i'm making the changes manually. But i would like to automate it using a php script. Is ...
0
votes
1answer
307 views

Restrict file access in php.ini

Can anyone explain me the difference between include_path and open_basedir in PHP? My php.ini looks like this: include_path = ".:/usr/share/php:/usr/share/pear:/var/www" If for example I try using ...
0
votes
3answers
823 views

How to find vulnerable sites on a web server

A client of mine has a managed VPS with dozens of websites on it, maybe even hundreds. Now his server keeps getting infected on a regular basis. The webhost / server admins keep digging in the dark. ...
0
votes
3answers
199 views

Does validating a mime-type reduce or stop the need for virus scanning?

I am building a small web app in php, that accepts .doc /.docx / .rtf and .txt files. I've validated them against their mime-types. But now I'm thinking about virus scanning. I know there are systems ...
2
votes
1answer
326 views

Inputting user ID's in URL?

I am currently working on functionality that will allow users to reset their passwords. My question pertains to the security in putting user ID's (a.k.a the auto increment ID's from database) in the ...
1
vote
1answer
264 views

If my website does not take any user input, is there any danger in showing my code and folder structure?

First time posting here; apologies for any mistakes I've made, please edit, retag, migrate as appropriate. I have a simple homepage whose purpose is (essentially) to contain my contact info and some ...
1
vote
1answer
995 views

Uploading images safe of XSS, php code and virus

I know that my question has been responded lot of times, but most the responses addresses functions that I don't even use (like use include with images) and that makes me worry because maybe I'm not ...
0
votes
1answer
590 views

How long would it take to brute force the AES encryption?

I'm trying to write a secure code that can keep my site users passwords as safe as possible. Now I'm fairly new to encryption and would like some professional opinions and suggestions. As well as a ...
0
votes
1answer
198 views

Website Link Spam Hacking Protection [closed]

I've recently been employed as a junior web and software developer for a small company, and noticed that their Home page has had links to completely unrelated sites added like spam to the index.html ...
2
votes
3answers
145 views

A scammer placed a remote file on a Wordpress website?

A previous developer I have used has got upset and start compromising the files of my website on daily bases (such as changing the index of the site with weird messages, deleting the .htaccess, ...
-3
votes
3answers
3k views

Generating an unguesable token for confirmation e-mails

I'm generating a token to be used when clicking on the link in a verification e-mail. I plan on using uniqid() but the output will be predictable allowing an attacker to bypass the confirmation ...
3
votes
3answers
350 views

Understanding JVM zero day in relationship with other runtimes

I am a .net and php developer and since java has been in the news recently thanks to the string of zero days, I decided to brush up on security. In regards to the java zero days, this question has ...
3
votes
2answers
415 views

Is mt_rand() suitable for generating a salt?

Assumed I have to following code in order to generate a random blowfish salt for saving a new password: $blowfishCharacters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789./'; $salt ...
4
votes
3answers
2k views

How do I capture POST data then forward user to another page?

I currently have a demo site setup where I load the login form over HTTP and then POST to a HTTPS URL. The aim is to demonstrate that this is not a secure method of handling the login. I'm using ...
0
votes
2answers
315 views

How do I securely identify a remote (self programmed embedded) device in PHP?

Is there a reliable way in PHP to identify a device that might be behind a Router (so the IP is not unique)? Background: I have several embedded devices (self programmed & adaptable) that contact ...
0
votes
3answers
703 views

Ways to keep AES encryption key safe.? [closed]

I am using AES encryption to secure some sensitive data. For that i have to provide a certain key for encrypting and decrypting. It's not safe to keep the key somewhere on the server. So instead of ...
-4
votes
3answers
296 views

PHP web application security [closed]

I am building a PHP web application, that needs enhanced security, due to the fact that it contains very sensitive information (in a database). I think that I want to use self-signed SSL ...
12
votes
3answers
5k views

SQL injection can bypass login but not drop table

I've setup a test environment for running some SQL Injection against my code and learning how to defend against it. I can bypass the login form using the following in the password field: ' OR ...
5
votes
1answer
192 views

SQL injection not returning expected results

I've created a test site in order to learn about SQLi and then protect against it. I may be misunderstanding how it is supposed to behave but at present I'm not getting the results I expect. The ...
0
votes
1answer
379 views

Elgamal algorithm PHP code [closed]

I was wondering if there is a PHP implementation for Elgamal algorithm for website data security ? I found that for EC, Diffie-Hellman but could not find any about elgamal. Thanks in advance.
1
vote
2answers
111 views

Mysql database password and webform password

I have a Mysql database where one table is meant to store user complaints/comments/suggestions. I am using Mysqli to connect to the database with a ...
34
votes
5answers
5k views

How to Securely Implement a “Remember Me” Feature?

Assuming you already have a website that implements all of the standard login stuff, what is the correct and most secure way to allow users to automatically be logged in for a certain time period ...
7
votes
4answers
800 views

Security attacks on PHP web applications

I know about following security attacks on php applications (html,php,js). XSS SQL Injection CSFR Session Hijacking /Fixation Code Injection Remote file injection Should i know about any other or ...
0
votes
2answers
380 views

How to implement shamir's secret sharing algorithm using AES_ENCYRPT

I am using MySQL AES_ENCRYTP() and AES_DECRYPT() to store sensitive details in a database, and currently storing the key in a php file outside of the web root with read access only. The key file looks ...
7
votes
3answers
1k views

Is it a secure way to declare DB parameters in htaccess rather than in a PHP file?

It has been suggested in securing PHP article that using directive as below in htaccess is more secure than hardcoding it into your app: <VirtualHost ilia.ws> Include /home/ilia/sql.cnf ...
2
votes
2answers
459 views

Suspicious entries in MySQL database from user input forms - sql injection?

I built a website from scratch using PHP and MySQL for my residential community and our budget is a big fat '0'. Five days ago I discovered that there were 222 entries in a table in my database that ...
-1
votes
1answer
405 views

Protect against Tamper Data add-on

When it comes to uploading images on a website. I know you can trick the php to believe that the file is an image by changing the extension to ".jpg" from ".php". Then once the file is uploading you ...
8
votes
4answers
782 views

How dangerous is it to store password in plain text on sites like GitHub?

I have a few private repositories set up on GitHub for some of the projects I am working on for my company. These applications connect to databases and I have database authentication credentials ...
3
votes
3answers
970 views

SQL injection using letters and numbers?

I was wondering if it is at all possible for a hacker to perform an SQL injection attack using just letters and numbers. For example, let's take a look at this PHP code which uses regular expressions ...