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

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PHP Object Injection Prevention - OWASP

So I was just reading up on the OWASP site about PHP Object Injection. According to their site, the suggested fix is to not use serialze and unserialize but to use json_* (json_encode and ...
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2answers
117 views

Is php DOMDocument::loadXML completely secure?

Our application is using loadXML extensively to recieve data(input) from the users. Other than the usual checks for SQL injections and XXS, are there any known risks in parsing the xml file using ...
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2answers
198 views

PHP shellcode inside /tmp. Is the server compromised?

I have a Debian 7 VPS that runs Nginx, PHP5-FPM and MariaDB. This server runs a couple of WordPress installations, phpMyAdmin and Roundcube Webmail. One is my personal blog running WP 3.9.1 and ...
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0answers
63 views

Where to save digital content and prevent sharing?

I've been inspired by the answer to the question here: Location to store an encryption key It gave me a lot to think about. My friend and I are building a website and we've encountered a problem in ...
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1answer
173 views

Is this a bot fishing for security vulnerabilities on my site?

I am running a webpage for my family with a feature to track users and guests. Since its all just family stuff no one ever visits this server, and I hardly see more than 2-3 of us logged on at the ...
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3answers
682 views

Is this a secure way of storing passwords? [duplicate]

So a couple years ago when I was learning basic back-end web development, I found a tutorial for creating a basic log in system. I haven't done much modification to the code since, but I have the ...
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3answers
1k views

Why do WordPress installations retrieve the crypto secrets remotely on installation?

It seems that WordPress retrieves all the crypto constants remotely (via HTTPS): // setup-config.php $secret_keys = wp_remote_get( 'https://api.wordpress.org/secret-key/1.1/salt/' ); Are there ...
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1answer
106 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 ...
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3answers
59 views

How secure is my method?

I want to select data from a MySql database on an iphone device. The method I seem is the easiest one is to connect to a php file with GET arguments and then return it as a string. Now I'm just ...
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3answers
1k views

Allowing users to input a safe subset of HTML

I recently posted this question on Code Review and it was recommended that I ask you guys about it. Basically, this will be used to allow users to generate formatted content. It gets put inside of ...
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1answer
98 views

System that manages real money

I am working on a project that incorporates real money into peoples accounts. Their accounts are stored in a MySQL database and inside it there is a column called "BALANCE". When the users send money ...
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1answer
814 views

cURL cert validation with curlopt_cainfo not working

I want to validate my SSL certificate each time I run API calls. I've been following this guide: http://artur.ejsmont.org/blog/content/how-to-properly-secure-remote-api-calls-from-php-application ...
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1answer
147 views

Is it possible to avoid PHP string validation with malformed UTF-8 string?

Some of the old PHP string functions for example explode() are working with UTF-8 strings, but they don't work properly on malformed UTF-8 strings. Is this a security issue? Is it possible to avoid ...
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2answers
158 views

If md5 is only insecure because of its speed, why doesn't this workaround make it reasonably secure?

I'm going to preface this by saying I have absolutely no clue when it comes to cryptography, but I'm posting this question because I'm very interested and I have no doubt there are some smart people ...
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1answer
196 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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0answers
161 views

Starting database security for web app that logs in with Facebook/Google JS SDKs

I have been making a web app that uses Facebook and Google JavaScript APIs to login (no email login) on the client side and currently it accesses a localhost MySQL database directly using PHP and ...
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0answers
32 views

Directory names using extensions a security risk?

In our app (PHP, MySQL) we allow users to create templates which are stored in their own subdirectory (which is named by the template name). Someone suggested to use standard file name sanitization ...
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1answer
212 views

Path Truncation not working in PHP while exploiting LFI

From what I understand in PHP '/etc/passwd/' or '/etc/passwd/./././' should be treated just the same as '/etc/passwd' I am using PHP 5.4 and this does not seem to be true: php -r ...
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4answers
203 views

How to detect credit cards harvested from memory?

Had a chat recently with PCI compliance specialist and got to realize there is a way to steal raw data from Apache / Nginx memory e.g. credit cards. It's called "harvesting" and becomes pretty common. ...
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2answers
104 views

How secure would this method be considered for password storage

Ok I am currently storing the passwords in most secure way I could think of. With use of Encryption and Hash. The passwords are first generated by user as plain-text with minimum length of 6 ...
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1answer
88 views

BigDump v0.35b vulnerability [closed]

I dont understand what the problem with BigDump v0.35b. This site says that it have problem. But i dont understand it. Problem here? if (!$error && isset($_REQUEST["uploadbutton"])) { if ...
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2answers
91 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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3answers
352 views

PHP IP check as security?

Would just like some input on a PHP script I'm writing. It's just a simple script that only myself should be able to access. I don't have a dynamic IP address, so this isn't an issue for me, but I'm ...
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2answers
786 views

How could attackers exploit $_SERVER['HTTP_REFERER']

I've been warned that PHP's $_SERVER['HTTP_REFERER'] is a common attack vector for websites. What are ways that attackers exploit this function? How can I guard against them?
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3answers
767 views

What would the potential abuses be for an HTTP API that accepted raw SQL?

I was wondering what some of the potential abuses could be for an HTTP API that accepted SQL queries and output results sets. The fact that this is the canonical definition of SQL injection is not ...
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3answers
158 views

Is this a secure function for checking if a user has not stolen a session cookie?

As an exercise for class, I'm creating a class that manages user sessions. The session details are stored in a database and also there is a $_SESSION[user_id] variable to carry in between pages. The ...
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0answers
61 views

trackback spotted in multple http errors

[Sun May 11 12:24:46 2014] [error] [client private ip] [X_FORWARDED_FOR 27.159.207.165] Path not found: /contact_us_public.php/trackback/, referer: http://www.mydomain.net/contact_us_public.php Does ...
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5answers
2k views

Is there a way to check the filetype of a file uploaded using PHP?

I don't want it to just check the extension of the file as these can easily be forged even MIME types can be forged using tools like TamperData. So is there a better way to check file types in PHP ? ...
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1answer
107 views

Is it possible to add backdoor to a file with the same size and crc32 checksum (4bytes)?

Is it possible to add backdoor to a file with the same size and crc32 checksum (4bytes)? (The file does not contain byte code, it contains program code as text. The language is PHP.)
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2answers
254 views

Is there any issue using the PHP crypt() function with an additional salt?

Is my PHP authentication script secure? I noticed that the hashes start with the first two letters of the username. Could there be a security flaw using crypt() in such a way? <?php // ...
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2answers
248 views

Are PHAR archives secure?

I want to send the new releases of my application in encrypted, signed archives to the server. Are PHAR archives a good solution to do that? Is PHAR secure enough?
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2answers
461 views

Are my session settings secure enough?

I'm developing a file hosting and sharing web application. Are the following PHP session settings secure enough? ini_set('session.cookie_httponly', 1); ini_set('session.cookie_lifetime', 0); ...
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1answer
257 views

Email Spoofing Modified Headers

I have be reading more and more about email spoofing and was curious how some things are done. I know in PHP you can simply do mail() and then include "From: spoofsender@provider.com" for example, ...
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1answer
356 views

Php Session ID, http VS https [duplicate]

So I was doing some tests with the php session ID cookie. I know that data is stored on the server however, a cookie with a unique ID is stored so that the server can recognize the client while ...
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1answer
177 views

How important is a mysql password for localhost?

We can assume that if an attacker gained access to a web server running mysql that they would be capable of reading the scripts to determine the mysql password. If mysql only responds on localhost, ...
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3answers
743 views

How to deobfuscate this PHP malware?

Two days ago a file called "images.php" appeared on a friend's server, which he noticed because it caused errors. The file contained the following. This code is of unknown origin and presumed to be ...
0
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1answer
107 views

Dangers of PHP uploading word docs into a quarantine

I plan to write a PHP script which will allow web users to upload MS Word formatted docs. Here are the precautions I am taking: Filenames will be created by me (something like YYYY-MM-DD.doc) Files ...
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3answers
1k views

How to access directories disallowed in robots.txt?

While scanning my website with uniscan it found my robots.txt file which disallows access to /cgi-bin/ and other directories, but they are not accessible in browser. Is there a way to access the ...
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2answers
224 views

Assigning cPanel MySQL Privileges

When I log into cPanel, I go to create a new MySQL Database with the wizard. Usually, it is recommended to assign the database user with all of the permissions from Insert, Update, Alter, Execute, ...
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3answers
303 views

Is web app safe in not public folder?

I'am wondering if it's really safe to use this structure of my web application. WEBAPP Application Controllers Models Views ... Framework ... ...
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1answer
188 views

Configuration settings for sessions in php

I recently found the following configuration settings: use-strict-mode hash-bits-per-character hash-function and I have some questions about them: Use-strict-mode says the following: ...
34
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6answers
4k views

PHP files browsable: is this a vulnerability?

I have a friend who has a website developed in PHP on which we can browse all his files one after one (of course, we can not read the content of the PHP files). Do you think this is a security hole ? ...
30
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6answers
3k views

Should I obscure database primary keys (IDs) in application front end?

I'm working on an application which allows a moderator to edit information of user. So, at the moment, I have URL's like http://www.example.com/user/1/edit http://www.example.com/user/2/edit I'm a ...
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2answers
459 views

Sql injection is not working on my site?

I have set up a page and database so I can practice SQL injection. Ive tried some examples and it doesn't seem to work. It seems to add the username and password to that database, even though I input ...
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2answers
112 views

How can you detect an insecure, non-random token?

I know that some of PHP's random functions are insecure due to them not being completely random and are considered a bad practice. My question is how an attacker go about finding that the developer ...
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0answers
195 views

Failed to connect to netcat reverse shell

I am doing an exercise of PentesterLab, I've got a webshell called 1.pdf, and it can be included in index.php as a PHP file. It contains code like this: %PDF-1.4 <?php echo system($_GET["cmd"]); ...
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1answer
1k views

Does Heartbleed affect servers if OpenSSL was only used to generate the certificate?

I built an application that generates certificate signing requests (CSRs) using the PHP OpenSSL module. Is there a way that the HeartBleed bug can affect these (in use) private keys and CSRs that ...
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2answers
2k views

How do crackers upload php scripts to Wordpress' wp-content directory?

I've seen a site that has been attacked by uploading php scripts (presumably some sort of shell, or code that loads a shell) to Wordpress' wp-content/uploads directory. Usually this directory is used ...
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1answer
190 views

PHP and max_input_vars configuration

I am looking into php's max_input_vars setting How many input variables may be accepted (limit is applied to $_GET, $_POST and $_COOKIE superglobal separately). Use of this directive mitigates ...
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1answer
546 views

Do PHP frameworks such as Zend, symfony and CakePHP provide default protection against cross site scripting?

ASP.NET MVC provides default protection against cross site scripting. Just wondering, if PHP frameworks do the same?