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

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116 views

PHP Handlers and Caching

I recently began configuring our production server for a new Drupal site. Up till now, I've always used the default PHP handler mod_php, and removed write privileges for any directory/file except ...
4
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2answers
353 views

If Apache is configured to parse PHP can users see PHP source code?

If Apache is configured to parse PHP and not allow to index files, are there other ways users can see PHP source code, either with or without intention?
31
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4answers
6k views

Convince the company not to store credit card numbers in our webapp

The company I work for needs a system to perform monthly credit card charges to customer accounts. Customers will be able to update their credit card information from an online interface written in ...
3
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1answer
3k views

Header opening a PDF file, can someone hack a website from there?

Can someone hack a website that uses this kind of header to open a pdf? <?php header("Content-type:application/pdf"); // It will be called downloaded.pdf ...
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2answers
718 views

How a database connection makes mysqli_real_escape_string more secure?

I am learning PHP+MySQL and observed that mysqli_real_escape_string function in PHP requires a identifier to a MySQL connection. From some research I found that it has something to do with charset and ...
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2answers
366 views

Protecting sensitive content in JS source code and Ajax cals [closed]

I've been trying to see how to properly protect important content that's passed in ajax calls with java script. Considering JavaScript can be viewed at any point, it is inevitable that some of your ...
10
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2answers
15k views

Protect against POST //cgi-bin/php attacks?

I am being attacked with this cgi injection: POST ...
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2answers
1k views

PHP on IIS 7.5 Hacked - How do I find and fix the XSS Injection?

I discovered that someone had gained access via FileZilla server software to my Windows 2012 Server. It seems like they had created extra accounts and were trying brute force attempts to get in nearly ...
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1answer
252 views

Service TO Service Authentication & authorization [duplicate]

I have two web services A and B the requests between those services is http. I want so establish a secure connection between service A and service B to ensure the authorized and authenticate request ...
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0answers
215 views

Implementation of different BCrypt versions

I'm fairly new to encryption, and I am investigating the different kind of encryptions. I want to encrypt passwords in a secure way. I discussed this with my colleague, and he said that BCrypt is the ...
0
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2answers
161 views

Security on Ubuntu 12.04 LST Server for Business App

I am developing bussines application based on php and mysql on ubuntu 12.04 lts server. I have closed all ports except :80 and php code can be executed only by security login and not using cookies but ...
0
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1answer
138 views

File-structure when using token

I'm using a form-token to secure the validation process of my php-file. Basically the structure of the php-file looks like this: if ($_POST) {//form has been submitted? if (validateFormToken) { ...
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3answers
2k views

Is this code snippet good enough for password hash and salt

After a few days reading up about salting and hashing passwords, I found an actual bit of code that tells how to do it. This is what I found: $blowfish_salt = ...
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1answer
562 views

Submit form with token

I have a token that I want to use to prevent direct access of some php-files. Some of these php-files are loaded via AJAX. The token is used with a session to secure form submission AND to prevent ...
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1answer
1k views

Why does MySQLi using question marks (?) instead of the sprintf formatting?

As the title states, why does MySQLi use question marks instead of sprintf() formatting? For example, why is it $stmt = $mysqli->prepare("SELECT * FROM table WHERE column1 = ?"); ...
0
votes
1answer
501 views

Can query string command line exploits in older CGI implementations of PHP be protected against without updating PHP versions?

We recently received this from a security audit: PHP is a general purpose scripting language that can be embedded into HTML. A vulnerability exists in PHP versions prior to 5.3.12 and 5.4.2 due to ...
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1answer
826 views

Am I correctly preventing XSS in PHP? [duplicate]

While building my website I put together a security class which includes two functions, one takes input and returns it as a string passed through htmlentities function of PHP. The other strips out ...
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0answers
97 views

Is what flexi_auth does with its use of its $this->auth object good practice?

I am looking at the authentication library Flexi_auth for CodeIgniter. To use the library you have to create a object one time in the controller before the lib is used Like this: `$this->auth ...
4
votes
2answers
2k views

Is phpseclib a secure and reliable alternative to OpenSSL?

I know that OpenSSL needs to be installed and activated via apache and the config files, which can be cumbersome or even impossible, and that phpseclib is more flexible and easier to handle than ...
2
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1answer
2k 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
515 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
3k 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 = ...
4
votes
2answers
962 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 ...
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4answers
11k 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 ...
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4answers
3k 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 ...
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3answers
677 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 ...
4
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3answers
6k 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); ...
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4answers
732 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
1answer
520 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 ...
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2answers
2k 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 ...
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0answers
37 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
640 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 ...
6
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3answers
13k 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 ...
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1answer
2k 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 ...
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1answer
1k 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 ...
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1answer
402 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
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1answer
151 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 ...
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1answer
456 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
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1answer
678 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
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3answers
1k 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
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3answers
481 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
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1answer
844 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
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1answer
344 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 ...
0
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1answer
765 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
293 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
173 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, ...
6
votes
3answers
16k 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 ...
4
votes
3answers
480 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
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2answers
673 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
4k 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 ...