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

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2
votes
2answers
3k views

Is it possible to spoof the last proxy of an X-Forwarded-For Header?

I'm using a firefox plugin https://addons.mozilla.org/en-US/firefox/addon/x-forwarded-for-header/ to spoof the X-Forwarded-For Header to 8.8.8.8. For the following php page: echo ...
7
votes
3answers
809 views

How dangerous is it to use CSS styles from an untrusted source?

I'm a moderator at a forum. We want to have a new style for the forum. We're thinking about announcing a competition to the users to come up with the best CSS design; we would adopt the best ...
0
votes
1answer
169 views

Comparison between Data Encryption Tools and Data Sanitization Tools [closed]

What are the famous Data Sanitization Tools for languages such as ASP/PHP/Html Web Sites? Which Data Sanitization tools have the best results? Difference between Data encryption and Data ...
2
votes
1answer
3k views

Stopping Session Hijacking

If you noticed, I put "stopping" instead "preventing" in the title because I want my PHP application to be as secure as possible. I am wondering if anyone has any better ways to prevent session ...
1
vote
1answer
332 views

Protect database resources from fake data inputs via web forms

Scenario: I'm working on a project that needs to accept large amounts of data (customer data) from its users. So it can be normal to have a user trying to add 10,000 or 100,000 records at a time. In ...
15
votes
3answers
15k views

Creating Secure PHP Sessions

I have already created and refined both registration and login systems, However I am lead to believe the tricky part comes when you are creating a session. As far as I know this is due to both ...
0
votes
1answer
219 views

Malicious PHP code can run in cache. Solution?

I have a module that I cache some details (w/c is from the input of the user) to lessen the load of my database The way how I cache is by creating html page with the details of the user using ...
1
vote
1answer
91 views

sigsegv in php5.3.10

I found an overflow situation in php5.3.10. Probably it's not 'something new', but if I can understand this, it will help me to find this kind of bug faster in the future. What can I do to check ...
3
votes
1answer
807 views

Preventing spoofing of remote server with PHP & cURL

I'm writing a PHP script that is requesting confidential data from a remote server. I'm using cURL to get the remote server's certificate information (for its output, please see below). Which array ...
6
votes
2answers
128 views

Security concerns with pre-pay system

I am looking at setting up a pre-pay system for the food retail industry. Retailers will be able to generate random 10 digit codes and supply these to customers to enter into an app to gain the value ...
4
votes
1answer
907 views

172.16.33.197, 127.0.0.1 IP addresses in visitor logs

I have a website running Apache and PHP. I see that there are visitors with IP addresses 172.16.33.197 and 127.0.0.1. These addresses do not belong to our network. I get the visitor IP addresses with ...
0
votes
2answers
982 views

Running Apache as system service on Windows 2003 R2 64-bit

Trying to make my point, that running Apache with PHP5 module as Windows service is not secure. All I got to prove it - FTP access to some internal website. So what I did - I uploaded file test.php ...
0
votes
3answers
868 views

Viewing the configuration.php

My understanding is that you should never host your configuration.php file within the public_html directory (I am specifically referring to Joomla, but I imagine this is a cross-platform scenario). ...
3
votes
3answers
2k views

User data encryption/decryption in a database (PHP)

I was wondering which is the best way to encrypt and decrypt user data in a database, to make it much more secure as it is possible? I was reading about AES but I would like to know if is really the ...
1
vote
2answers
862 views

Implementing SRP Challenge login system *with SSL* (Using PHP)

My question: Anyone knows how to implement SRP / Diffie-Hellman authentication in PHP (or if this has already been done)? (Some details) I'm using CodeIgniter with TankAuth (both latest version) ...
7
votes
1answer
2k views

PHP crypt() trims the salt as it would be too long

I am using Blowfish with PHP crypt() for password hashing but I noticed something weird. Quoting PHP documentation: CRYPT_BLOWFISH - Blowfish hashing with a salt as follows: "$2a$", "$2x$" or ...
2
votes
1answer
325 views

Is it safe to invoke PHP GD functions if you don't know whether file is a valid image?

There is image upload function in web application. After image is uploaded, it's resized using functions from PHP GD like imagecopyresampled and others. Before invocation of PHP GD's functions there ...
1
vote
1answer
226 views

Is it possibel to inject php code to roundcube errors log file via LFI vulnerability? [closed]

i tried to inject php code to roundcube errors log file, with no success. i think there is something filtering injected php code.
6
votes
4answers
1k views

Protecting against CSRF when a form is being submitted via an AJAX call

I'm using anti-CSRF tokens on all my forms to prevent CSRF attacks. Also, the tokens are being saved in the $_COOKIE variable to validate against the value I get from the form. I'm resetting the token ...
8
votes
2answers
4k views

when to use nonce?

I have trouble understanding nonce. I read a very good answer related to nonce by @Thomas Pornin, but it is too complicated for me as I am new to cryptography. From what I know, nonce is used to ...
4
votes
3answers
2k views

optimal way to salt password?

A good way to salt password? I have read a few answers related to salting password. But I started to get confused. I came across few functions people used to generate salt like: mcrypt_create_iv() ...
2
votes
1answer
199 views

Safe User Login Questions

I need help determining how safe the login is. First of all, I have been reading this: The Definitive Guide To Forms based Website Authentication It's really well written, great information most of ...
9
votes
6answers
6k views

Why is php not used for banking sites or for a banking transaction?

Other programming languages popular on the web, such as Java and .NET, are used for banking sites. However, I've rarely (if ever) seen a PHP application designed to be deployed for a banking site. ...
5
votes
4answers
600 views

Is not checking the src url a vulnerability?

By using a system of special tags you can allow users to add custom images, for example, tags like [img]user_url[/img]. Then you replace the tags by their real HTML tags like <img src="user_url" ...
3
votes
1answer
180 views

Malicious php scripts in word press theme folder?

I am running a server on Ubuntu 10.04 running a word press website, and recently a virus scan revealed that I have several malicious scripts sitting in the word press folder. In particular they are in ...
2
votes
2answers
850 views

How to make a simple file integrity checker

I've seen many PHP file checker on the net. Basically they computes the sha hash of a requested file. Your PC queries periodically the script and alerts you if the returned hash changes. The problem ...
2
votes
2answers
370 views

Is it a weakness to be able to see server side scripting?

Are languages such as Cold Fusion and PHP less secure because they are embedded in HTML which is sent to a client? Someone told me they are less secure because they lack abstraction. CLARIFICATION: ...
2
votes
2answers
352 views

Can the `system` function pose severe security threats on a shared hosting server?

I recently bought an account from a shared hosting company and I needed the php system function to be enabled for one of my projects. So I created a ticket and asked them to enable it. This is what ...
3
votes
1answer
6k views

Where and How is data stored in a session?

Where is the information in the fields of a session stored? If I, for instance, store in a session something like $_SESSION['foo'] = 'bar'. Where is "bar" stored? If I store an object of a class, in ...
4
votes
3answers
5k views

Do you need to encrypt session data?

I came across a session management class in PHP which encrypts session data in the session storage folder (i.e., /tmp) and can be decrypted later in your script using a key. I was wondering if it's ...
-1
votes
1answer
2k views

How to hack linux from phpMyAdmin? [closed]

I got the username and the password for phpMyAdmin, and i am trying to hack the operating system "linux". i tried to create an payload.php file which is a pyaload taken form metasploit. i encoded the ...
5
votes
3answers
390 views

Security risks using tmpfile() for sensitive data in PHP

What are the primary concerns when storing sensitive data in PHP's temporary directory via tmpfile()? For instance: Could this data be recovered from HDD by a malicious admin? Could the admin easily ...
27
votes
4answers
4k 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 ...
2
votes
2answers
722 views

Potential insecurity in not sanitizing variables before INSERT with prepared statement in PDO

I use PDO with prepared statement when connecting to my database, and I do this because it is considered a safe way to do so, but one thing I could not help but to wonder was, can submitted data from ...
3
votes
3answers
335 views

PRNG: Does combining insecure algos help?

Reading about how insecure PHP's rand function is, I was wondering if it helps to combine random functions. The suggested function there, openssl_random_pseudo_bytes, can also be cryptographically ...
3
votes
2answers
411 views

Do LAMP log files sometimes contain sensitive information?

I will have a LAMP web server with CentOS and cPanel. With this setup, is it possible for any server log files, whether regular or error logs, to contain sensitive information in them, such as ...
3
votes
1answer
2k 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 ...
4
votes
1answer
564 views

Intrusion attempt? Host 'somedomain.org' is not allowed to connect to this MySQL server

We have a web site hosted on a shared server. The hosting company's MySQL servers are hosted on a different server. We collect certain kinds of requests through a web form, and write them to a ...
2
votes
1answer
628 views

Can /etc/passwd file be accessed on a cpanel shared hosting account?

Given standard server hardening was performed, can the /etc/passwd be accessed by a shared hosting account by using PHP or Perl scripts which is executed from the public_html of the shared account?
10
votes
1answer
2k views

How to properly secure a $_GET in PHP?

I found an SQLi in a buddies work site. He reported it to his superiors and they allowed me to run additional tests and also patch the site. After reviewing the site, The vulnerable code was a $_GET. ...
5
votes
3answers
3k views

How insecure are PHP's rand functions?

There are some pseudo-random-number generators in PHP: rand(), srand(), mt_rand(), mt_srand(). You can look at their code here. I understand those functions are insecure, but how insecure are they? ...
9
votes
1answer
901 views

Why do attackers bother (trivially) obfuscating their source code?

A friend of mine recently discovered and sent me a small collection of trojan php scripts that were uploaded to his machine. Here's an example: ...
3
votes
2answers
745 views

How to add safety to login page

I am making a website where users need to log in to use all the functions. The login form is placed on the landing page, but the actual login goes through a second page, login.php. If a user types ...
6
votes
2answers
207 views

HTTP daemon and Webroot permissions

We have a contracted web developer that uses deployment scripts to update and deploy web sites. In order for them to work they require write access to the whole webroot through the httpd user. I have ...
2
votes
2answers
145 views

Any solution to passing a penetration test for an outdated php web application without upgrading the application?

A vulnerability list for my project's PHP version. The client would rather not upgrade the PHP version to the last version. Also, it's quite probable that some code will break after the switch from ...
10
votes
3answers
1k views

Should IP addresses be validated to prevent SQL Injection?

In PHP I retrieve a user's IP address ($_SERVER['REMOTE_ADDR']) to use it in some MySQL queries, but I do not validate them to be true IP addresses. Should I validate user IP addresses before using ...
1
vote
2answers
364 views

Strange Pharma Spam Site resulting from DAT file created by SQL Injection?

Working on cleaning up a site compromise for a client. Leaving aside that the site is using bunch of custom CodeIgniter code written by someone who had no concept of security, I've ran into a ...
8
votes
3answers
18k views

How can I use this path bypass/exploit Local File Inclusion?

I have tried to run a vulnerability scanning script (Uniscan 6.0) on some websites and then I found a site which is exploitable with this following path. (included a word "invalid" , params/website ...
0
votes
3answers
3k views

How to filter POST requests before they reach PHP on Apache?

I have done URL filtering with .htaccess (using learning and generator), however I am still concerned that any POST request can be submitted to the PHP even there is only one POST form on the website, ...
10
votes
4answers
2k views

Why do browsers warn about mixed content for images?

I'm dealing with a phpBB forum user who wants to set up SSL on their entire site to secure user credentials and "private" parts of the website. However, they want to preserve the traditional forum ...