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

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1answer
340 views

Are LFI attacks possible (removing extension) in PHP 5.4.4+?

Wondering if there was a possible attack vector still around for LFI attacks that remove the file extension. Obviously the null byte was fixed in previous PHP versions and no longer works, along with ...
4
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3answers
191 views

Does PHP have a XSS API?

ASP.NET has a cross site scripting API by default, however does PHP have a cross site scripting prevention API?
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2answers
555 views

What is the best exploit of XSS within 100 characters? [closed]

I found a vulnerable php script on my website. The script allows an user input (textarea), which is not encoded by htmlspecialchars(). Therefore it is possible to add html and javascript code. The ...
1
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1answer
295 views

Do PHP/SQLI Prepared Statements Need Special Character Escaping?

I'm using php/mysqli queries such as this: $stmt = $con -> prepare("INSERT INTO `comments` (`uid`, `article_id`, `status`, `comment`) VALUES (?, ?, ?, ?)"); $stmt -> bind_param('iiis', $uid, ...
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1answer
190 views

Why protect files with sensative information with .htacces?

I was taught that an important step to securing a website (primarily with PHP) was to store all sensitive information such as database connection info, salt generation, etc. in a separate ...
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0answers
659 views

PHP - Need help to understand injected code [duplicate]

I discovered a lot of requests to a fishy file in a plugin on my Wordpress site. There, I found a long string, a mapping function for each character used in the string, and an excecution of the ...
2
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2answers
137 views

Attackers posting large HTML pages - just spam? or something more sinister?

More and more, lately - I've seen attackers posting complete HTML pages that seem to have nothing malicious - to php pages that aren't even listening to their POST (sometimes, it's a contact form, ...
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1answer
1k views

AES 128bit decryption using a key longer than 16 bytes

I got a little problem regarding AES decryption. I have to decrypt some text that has been encrypted using 128bit AES / ECB with PHP mcrypt. The thing is, the key that is being used to encrypt/decrypt ...
5
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2answers
794 views

Should every output element be filtered, or just those which contain user-editable data? [duplicate]

I'm combing through a legacy app updating SQL to prevent Injections and XSS vulnerabilities. I know to apply PHP's htmlspecialchars() anything that is directly passed to a script and displayed on a ...
4
votes
1answer
624 views

HTTP attack taking down PHP-FPM [closed]

Someone started attacking my site a few minutes ago and its caused PHP-FPM to max out all cores (4) on my vps and NGINX is now serving 502 to all users. I'm seeing a bunch of these requests with tons ...
4
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2answers
3k views

SQL Injection Modify / Insert Table Values

Is it possible to update a field in a MySQL database or insert a new row using SQL injection in this case: The only protection in the PHP code is mysql_real_escape_string(). The query is ...
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1answer
164 views

Encrypting sensitive data in a financial form

I'm currently building a B2B E-Commerce site for a client using WordPress. We sell industrial machinery ranging in the upper $100k-$400k price range. My client would like to have their financing form ...
2
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1answer
145 views

Is this somebody trying to exploit a vulnerability?

On our website, when an invalid PHP session ID is detected, it's logged and regenerated. This invalid session has been logged: n040jl1nujch72tkrmr0uilnl1, ...
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2answers
74 views

What sort of vulnerability is this?

I am testing one web application build using PHP. I found one vulnerability in which multiple user can log-in using same browser, without destroying others session. What this sort of vulnerabilities ...
2
votes
2answers
352 views

Writing errors to Apache's log file from PHP - are there any pitfalls?

I'm updating an application to write slightly more verbose errors to the system log file (in this case, /var/log/apache2/mysite_error_log). I hope that I'm not asking the proverbial stupid question ...
1
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1answer
287 views

What is the difference between OWASP PHPSEC and PHP-ESAPI?

On the surface it looks like both libraries are designed to preform the same functionality with similar "drop-in" capabilities. Are there differences that I need to take into account when making a ...
0
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3answers
1k views

Does this simple function add something to prepared statements?

I've been researching how to completely prevent against SQL injection, but there are so many different forms of injecting that completely preventing it looks impossible to me. I am using prepared ...
1
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1answer
69 views

PHP would this be risky (using hackable data for includes)

mysql_select_db($db.'_'.$table); include("/home/site/includes/".$type."/functions.php"); Would this be a bad idea if $table and $type are values passed via ajax from a JS script? And this.. ...
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3answers
848 views

How to exploit this include_once vulnerability in PHP?

I'm performing static analisys on a PHP code and came across with this situation: include_once SYSTEM_PATH . 'languages/content-' . $_COOKIE ['lang'] . '.php'; If I try to hack with this HTTP ...
1
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1answer
77 views

Can the following function be somehow exploited/used for malicious behaviour?

I am using a main Site Engine class which is constructing most of my pages. I'm using this language function to change language website for all of my pages in the start of the Site Engine class: ...
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votes
2answers
141 views

LAMP Stack Tiers - why?

What are the vulnerabilities mitigated by a tiered LAMP stack? As I understand it, any breach would allow access to the database even if it was tiered. What's the benefit? Are we better to ...
1
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2answers
425 views

VPN Client - Addtional Security Layer or a Useless Feature

I have a corporate web portal which is used for staff collaboration including a web-based mail interface connected to MySQL Database, corporate calendar, file storage, customer contacts data with ...
7
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2answers
3k views

Security concept for Android app with PHP based REST API

I'm trying to build my own PHP based REST Api for my Android app and I'm a litte bit confused by all the different user authentication stuff one can find on the internet. So I want to present my ...
3
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4answers
424 views

Lock a website login to a certain computer

I've got a web based system where a specific site only shall be available on a certain computer. On that computer I have a desktop application. The desktop application and the website communicate ...
1
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1answer
430 views

Why add “***” in user-agent in this malicious code?

I found the following in every index file of my sites on a server I have. It looks like its redirecting all android users to some spooky Russian site. $ua = $_SERVER['HTTP_USER_AGENT']; ...
0
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1answer
695 views

PHP sprintf vulnerability?

On some sites such as WriteCodeOnline, sprintf, vsprintf and other related formatted string functions are disabled for security reasons: Warning: vsprintf() has been disabled for security reasons ...
2
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1answer
180 views

Bypass Text Plain Rule

I want to know if I can allow uploading all types of scripts and add these rules to a virtual host configuration; so please advise and tell me if there will be some exploits that can be used to ...
7
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1answer
3k views

Two takes on PHP two way encryption - which one is preferable?

I need to encrypt some data and have it decrypted on a later point in time. The data is tied to specific users. I've gathered two possible solutions... 1: The first one is derived from the official ...
2
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2answers
88 views

Securing commands

For a project I'm working on, I need to securely send commands between servers. These commands should not be able to be altered, and there should be some security about not being able to just keep ...
3
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1answer
571 views

Shellshock and PHP fastcgi

I understand that running apache/mod_php is safe, but I havn't heard about the case of running php in fastcgi mode (via nginx/php5-fpm), so, anyone can confirm this is also safe?
2
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1answer
295 views

How secure are PHP sessions?

Should i worry about securing PHP sessions for my users? How do hackers steal the sessions? The information users of my site can view is not at all sensitive and if viewed or modified by a hacker ...
1
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1answer
69 views

Webserver has suspicious file

A webserver I know has this file which is "decrypted" to this file Now my question: What damage can this script do? And how could I inspect it correctly? (The compressed version needs a password and ...
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votes
1answer
113 views

Why injecting a php tag with XSS dosn't work? [closed]

So you all know about the XSS vulnerability but what I cannot understand is how come injecting a <?php ?> tag doesn't work? eg.: suppose there is a Stored XSS vulnerability in the index.php of a ...
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1answer
273 views

'Ghost' access to a php file on a web server

I'm developing a personal project and one part of the project is a php website, hosted at hostinger as a free plan, that allow clients to ping to it and stores the WAN IP and the NAT IP of them. ...
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5answers
7k views

Shellshock attack scenario exploiting php

I've seen attack scenarios involving using wget on cgi-scripts, but how about a scenario exploiting a web server php script that issues an exec() or system() call to a bash script? As far as I can ...
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votes
2answers
845 views

How to secure a login.php file? [closed]

I have a hand built website, and am triying to build a cms/admin-panel, and my username and password, are not stored in a database, but, in a two setup file like seen below. index.php <?php ...
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votes
1answer
99 views

Feedback Form Exploitation possible or not? [closed]

how an attacker can exploit the below provided feedback form in a company website containing the company’s domain? the feedback form does not store data into a database. The server side code only ...
0
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2answers
201 views

Apache Server Maintains HTTPS Connection To Mysterious Server (Hijacking?)

I've been on a shared webhosting plan for 10 years and I recently moved all of my sites (various WordPress sites and associated plugins, all in PHP, a MediaWiki site, and a lot of static stuff) to my ...
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2answers
192 views

Should I validate authentication form inputs?

I've got a login page with a form where they can input their account's email address and password. I'm doing the following things before even attempting to authenticate a user: Validating the email ...
3
votes
1answer
174 views

Does FCGId use environment variables? (Or is it a possible attack vector for CVE-2014-6271/7169?)

According to Red Hat httpd (attack vector): CGI scripts are likely affected by this issue: when a CGI script is run by the web server, it uses environment variables to pass data to the ...
10
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4answers
4k views

Location to store an encryption key

I'm building a secure system which stores messages on a server in a Postgresql database. The messages are stored encrypted with PHP's openssl_encrypt() function with the AES-256-CBC method. At the ...
1
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1answer
367 views

Is my authentication persistence system design secure?

This system is for a personal file upload and sharing web application made with PHP. When a user logs into the application, it has the option to "stay logged in" after closing and reopening their ...
5
votes
6answers
12k views

Mysql - two-way encryption of sensitive data (email addresses) outside of Apache, PHP and MySQL

We store user email addresses in our database, like many other websites. While we do take pride in the security measures in place, sometimes "just enough" is just not enough. We've begun looking into ...
0
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2answers
90 views

Possible security issues with on demand generated image from database

I want to know what could be the potential risk with the displaying part of this behavior. For the upload part : 1- A form with a file upload for image. 2- Image content is save into Mysql ...
0
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1answer
537 views

Is addslashes + htmlentities sufficiently secure?

I have addslashes(htmlentities($userInput)). It gets inserted into my database. (NOT a mysql db) Is it sufficiently safe from xss? Thank you!
16
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6answers
5k views

Is my custom password hashing algorithm insecure?

For all of my hobby web projects, I have coded a login system that these projects share. There is no critical data in these projects, the only critical data could be reused passwords. So I try to hash ...
1
vote
2answers
361 views

What permissions should I give to a MySQL 'user' that searches my database?

My site has a search form, which queries a few tables for whatever my end users want to find. What permissions should I give my MySQL user in order to search the database and update the 'times ...
2
votes
5answers
298 views

Can extra loading times on login attempts be a security threat?

I have a web application built with PHP with a login page where the visitor is supposed to enter his / her account's email address and matching password. Since I'm using the PHP native (slow) hashing ...
5
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3answers
862 views

is it safe to allow external images to be attached to Blog or any Web content?

I am filtering all images that attached to any content of my blog: Check for file extension. Check content type using $finfo = finfo_open(FILEINFO_MIME_TYPE); I also save the image temporary on my ...
3
votes
1answer
1k 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 ...