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

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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
772 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 ...
3
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1answer
384 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 ...
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2answers
2k 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
126 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 ...
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1answer
133 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
70 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 ...
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2answers
256 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 ...
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1answer
211 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 ...
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193 views

Posssible hack on site?

I found a strange file on one of my servers containing the code below. The file was last modified one week ago at 1.40AM in the night, which is a bit odd. I have done lots of changes on this site ...
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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 ...
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1answer
62 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
492 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 ...
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1answer
72 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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2answers
118 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 ...
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2answers
372 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 ...
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2answers
2k 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 ...
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2answers
234 views

How do web email clients store my passwords from other providers?

The situation comes down to this: When I enter in hotmail, it retrieves my messages connecting to other providers: they could only do so by using my email and password. Since I had signed in a ...
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4answers
267 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 ...
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1answer
124 views

owasp esapi php implementation for xss attacks

I searched extensively for good materials for prevention of xss attacks using OWASP ESAPI. But could not find any beginner material. I found a blog for basic security but not explicitly for XSS ...
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1answer
400 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']; ...
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1answer
429 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 ...
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1answer
145 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 ...
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0answers
87 views

Exposing pm.status_path

Do you think it's dangerous to publicly expose PHP-FPM pm.status_path? It displays "Pool Status", "Active Processes status" and "Idle Processes status", showing Script path and Request URI.
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1answer
2k 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 ...
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2answers
87 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 ...
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1answer
487 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?
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232 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 ...
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67 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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1answer
93 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
238 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
6k 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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2answers
689 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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1answer
94 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 ...
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191 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
159 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
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1answer
137 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 ...
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4answers
3k 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 ...
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1answer
251 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 ...
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6answers
11k 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 ...
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2answers
76 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 ...
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0answers
72 views

Filter GET requests with regexp : Whitelist approach

I'm writing a new website with php, there is no backend but users will be able to input search terms through GET queries and I was wondering : is it safe to whitelist query parameters using regexp? ...
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1answer
278 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
4k 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 ...
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2answers
170 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
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5answers
284 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
695 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
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1answer
878 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 ...
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1answer
272 views

Securely send password to script as parameter

I have an expect script on my server which opens a WebDAV connection to another server, expects a username and password, and then sends $arg1 and $arg2 as the username and password respectively. ...
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1answer
433 views

Is my AES/CTR/RIPEMD encryption correctly implemented?

Below is my encryption implementation in PHP. It's based on mcrypt, and uses AES-128 in CTR mode along with a RIPEMD-128 HMAC for integrity checking. For brevity, I've inlined the functions for ...