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

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1answer
111 views

is this code valid for securing passwords? [duplicate]

i was wondering if this is a secure method for a hashing password.if it is not secure please tell me what to do in order to make it secure $pass='test'//the password ...
2
votes
2answers
247 views

What are the security risks when users upload their HTML and javascript to AWS S3 and the content is used in a webapp?

I'm building this web app where users can login and build their own online presentation. To build the presentation they can use their own html, css and javascript. These user files are not uploaded to ...
0
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1answer
261 views

XSS attack vector without forward slash?

is there an XSS attack vector that allows the inclusion of a external .js file without having to use forward slashes? let's say the path of the file is somewebsite.com/js/xss.js Is there a way to ...
0
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1answer
69 views

Storing third party auth info; Is this secure?

I have a feature request to connect my PHP web-app to the users mail server. I have usually strayed away from this type of work as it will mean storing the users email passwords. My question: is it ...
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2answers
141 views

Is Temporary XSS a Problem?

I use a site on a regular basis so I wanted to make sure it was secure. One of the things I checked was that when I changed my first name to <img src="http://blah.blah/blah/blah.notanextension" ...
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1answer
254 views

How can I recover from a hacked WordPress site and prevent future attacks?

I have a dedicated server running WordPress and have recently noticed that its been hacked and PHPShell a remote web server controller has been uploaded. This has let the hacker view and edit files ...
0
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1answer
152 views

Removing Unnecessary Services & Packages in a MySQL Ubuntu 12.04 Server [closed]

As part of hardening a MySQL 5.6 server running on Ubuntu 12.04 LTS, unnecessary services and packages will have to be removed. For a server that is serving only as a MySQL server, what services and ...
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2answers
210 views

Security of login form

I would like to know how secure is this code I made for a login form... because I'm new in this and have serious doubts. $sql = "SELECT user_name, user_password " ."FROM users " ."WHERE ...
2
votes
2answers
2k 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 ...
18
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2answers
6k views

Risks of a php image upload form

So I have a client wants a photography site where users can upload their photos in response to photography competitions. Though technically this isn't a problem, I want to know the risks associated ...
0
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1answer
476 views

Is ASP.net More Secure than PHP in GENERAL? [closed]

In other words, my (long version) question is: Are developers able to get away with, more using ASP.net than PHP in terms of writing secure code for their apps? I ask this because ASP.net has many ...
2
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1answer
257 views

Clamav can't detect encoded virus files

I have a PHP sheller file (like c99 file) but it's Encoded ( with this functions: eval(gzinflate(base64_decode("7P3rehblahblah)) ) and the clamav virus scan can't detect it. How i can detect virus ...
0
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1answer
176 views

Is my hashing technique secure? [duplicate]

I am not sure if this is the best place to post this type of question. I have come up with function which, I believe, is a very secure method of hashing. (I could be completely wrong). Here's the ...
-2
votes
1answer
115 views

Cross-checking Driver's License Against DMV Using MySQL DB or PHP Script? [closed]

Ok, so I am coming into this a little blind on how to go about allowing this app to store and check one's driver's license ID against the DMV or some other government agency. Basically, everything ...
1
vote
1answer
489 views

www-data is sending rogue mails through sendmail. How do I find the source?

So I have a Ubuntu server hosting a PHP-based web site for me. Some of the services rely on sendmail being configured. I have set it up to send through my GMail account. As of yesterday ~19:00 CET, ...
0
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1answer
1k views

About password_hash() in PHP and storing (part of) its salt outside DB

So, i learned that new in PHP 5.5 is password-hash() which works much like crypt(). Which is more secure (slower) than md5() or sha1(). The result string is algo+hash+salt, which can be passed as-is ...
2
votes
4answers
453 views

Session id on page html source code

I want to know if it's dangerous in any way to store the current logged user session id on the page generated source code. Why I wanted to do that? I'm trying to share the user session between two ...
1
vote
3answers
169 views

is it possible to write php code in address bar and its gonna work? [closed]

Is it possible if i use in address bar this host.com?<?php unlink("/img/bg.jpg");?> or host.com?<?php rename("/bg.jpg","bg.png");?> if not then is there any way to do that?
2
votes
1answer
1k views

New to security, is php password_hash() good enough?

This is the first time I've had to handle personnel information and I want to make sure I have a good amount of security. I will be storing users' emails and passwords for their accounts on a MySQL ...
0
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2answers
78 views

What influences the speed of rendered php page using encryption [closed]

I've built a web app which uses the openssl_private_decrypt() functions. The rendering of a page with 15 messages encrypted with these functions takes remarkely longer as the ones without. (3-4 ...
-2
votes
1answer
315 views

Injected Images

I want to learn all about that. How can we inject code into an image? Is the code must be php? Or is javascript or HTML works too? How I find documentation about this article? I'm a newbie about ...
0
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1answer
301 views

Possible ways of exploiting PHP register_globals [closed]

I have a PHP script that executes a bunch of commands to verify that a user is logged. if (( isset ($password) && $password!="" && auth($password,$hidden_password)==1) || ...
1
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1answer
401 views

Is a simple Whirlpool hash with random salt secure enough? [duplicate]

I've been working on a site that requires users to login. It's written in PHP with MySQL, and passwords are stored as Whirlpool hashes with a salt (source code later). However, security sites or ...
1
vote
3answers
154 views

How to minimise risk to sensitive data in temp files in shared hosting environment before encryption?

openssl_pkcs7_encrypt() requires the data to be encrypted to be read from a file and so unfortunately it requires sensitive data to be written to temporary file before being encrypted. In a shared ...
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4answers
917 views

Reasonable way to store encrypted passwords in a webapp's database, Linux

This question is generally similar to past questions asked here, but I haven't seen one the relates to Linux. Case at hand: a PHP web app has a MySQL backend. As part of its functionality it accesses ...
1
vote
1answer
561 views

Which digest algorithm to use with creating a public/private key pair

I'm generating a Public/Private key pair in PHP with the following: <?php $config = array( "digest_alg" => "sha512", "private_key_bits" => 4096, "private_key_type" => ...
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votes
2answers
116 views

Executing PHP WeService script by clicking a link within an e-mail

I'm receiving e-mail from my PHP/MySQL application with certain links. I was thinking on including an UUID as part of the link, which would point to a Web Service that ONLY reads those UUIDs. Those ...
1
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1answer
1k views

Null byte injection on php?

I look for answer, is it possible to perform null byte injection on PHP code, and how vulnerable code should look like. Give me some example, as I noticed that: <?php echo $_GET['get']; will ...
1
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2answers
104 views

Enforce a time limit on the number of uploads per user

I've done a lot of searching on SE and particularly here in regards to preventing issues or attacks for an image based website to accept image uploads, but I haven't seen anyone mention the idea of ...
2
votes
2answers
642 views

How to write a rock solid TOTP implementation?

I am currently writing a TOTP implementation in PHP (but this applies to other languages as well) and of course want it to be as secure as possible, what should be considered? After reading the ...
2
votes
2answers
571 views

Unrestricted File Upload - Possible exploits

During a penetration test‎ (exercise) on a IIS web server + MYSQL DBMS, I have found an Unrestricted File Upload vulnerability for which I can upload a .php file. So I have tried to upload a php ...
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2answers
94 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
237 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?
26
votes
4answers
3k 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
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 ...
1
vote
2answers
351 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
155 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 ...
8
votes
2answers
10k views

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

I am being attacked with this cgi injection: POST ...
2
votes
2answers
674 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 ...
5
votes
5answers
15k views

Playing with Referrer Header

There are 2 sites: http://www.site1.com http://www.site2.com http://www.site1.com contains link to http://www.site2.com as <a href="http://www.site2.com/">link<a/> When user clicks ...
2
votes
1answer
680 views

Using Random Numbers As Session variables

I am using randomly generated numbers as session variables to identify the sessions in a PHP application. To make further security proof what ways should I follow?
0
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1answer
105 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 ...
1
vote
0answers
118 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
votes
2answers
129 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
votes
1answer
2k views

Proxy / VPN Quality Check / Detection

Is there any way to build a script which detects or rates proxies like Maxmind's proxy detection software? I have already tried to use this code, but it doesn't detect all proxies, in fact it detect ...
0
votes
1answer
117 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) { ...
8
votes
3answers
1k 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 = ...
2
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1answer
209 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 ...
12
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6answers
3k views

Why do people say that PHP is inherently insecure?

I've heard it said that PHP is inherently insecure. Is this true? Why?
3
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1answer
385 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 = ?"); ...