Tagged Questions

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

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1
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0answers
554 views

A proposal for Data Transmission and Password Encryption [closed]

I need to implement a sensitive data protection scheme which can meet the requirements on secure data transmission, protection and storage, assuming mutually trusted third party is not available, that ...
40
votes
5answers
5k views

Password security in databases - today still best practice? [duplicate]

Possible Duplicate: Which password hashing method should I use? There are a ton of great posts about password security in databases on stack overflow and on other sites and as I am ...
2
votes
1answer
938 views

Help in understanding a PHP exploit code found on a wordpress application

I've found this code in base 64 on all php files of one of my client's sites (wordpress) and I'm trying to understand what it does. I'm also trying to figure out if it was an application exploit or a ...
4
votes
4answers
789 views

Database Security Best Practices for E-Commerce Site [duplicate]

Possible Duplicate: Securing an E-commerce site I'm developing an e-commerce site in a LAMP environment. Is it advisable to separate data on to different servers (i.e. to have one server as ...
6
votes
2answers
199 views

What to consider when generating random code as part of two-factor authentication?

I want to write a patch for a two factor authentication system that someone else has started. The code is a module for a PHP content management system and sends an SMS message to a user's phone, after ...
6
votes
2answers
1k views

What are the dangers of storing webserver temp files in the /tmp/ folder?

I have configured my first publicly accessible nginx server. I have configured it to use a /tmp/nginx folder to store temp files. This includes the body of http requests, proxy files etc. The /tmp ...
5
votes
1answer
490 views

question for pentesters: PHP proc_open() in safe_mode

Can anybody explain to me how proc_open() is affected when PHP is running in safe_mode? As far as i have noticed, the command to execute is appended to a '/' - is there anything else and is it ...
2
votes
1answer
135 views

What is a good method to report security breaches that are being used to actively spam?

I received an email the other day purporting to be from a bank I hadn't even heard of, so I decided to poke around. On some quick investigation, it looks like something has just latched onto some poor ...
1
vote
0answers
176 views

How anonymous used UTF-16 ASCII to fool PHP escaping [duplicate]

Possible Duplicate: How anonymous used UTF-16 ASCII to fool PHP escaping (Reposted here as per request). A few months ago, anonymous took down a child pornography site using SQL-injection. ...
19
votes
4answers
6k views

How did Anonymous use UTF-16 ASCII to fool PHP escaping?

A few months ago, Anonymous took down a child pornography site using SQL-injection. I read in this article that Anonymous claimed that "the server was using hardened PHP with escaping," but they were ...
6
votes
1answer
2k views

CSRF prevention in PHP

Two questions. Where does one download the PHP version of OWASP's CSRF Guard? The following URL says to check Git: https://www.owasp.org/index.php/PHP_CSRF_Guard All I see on Git however is ...
1
vote
1answer
1k views

How can log poisoning be successful with a Local File Inclusion attack?

I just read a paper about Local File Inclusion on exploit-db.com, it can be found here. One technique with LFI is log poisoning as you may know already. You do an HTTP GET request that contains PHP ...
3
votes
4answers
4k views

How is my website vulnerable for sql injections?

I am running a small website where I have published some articles. I am also very interesed in security topics and tried sqlmap on my website. It found the database name, so my question is how it ...
4
votes
2answers
2k views

openssl_digest vs hash vs hash_hmac? Difference between SALT & HMAC?

openssl_digest vs hash vs hash_hmac I want to use SHA512 for storing password. Which of the above methods are best to use? Why? What is the difference between SALT & HMAC? I just read ...
2
votes
1answer
296 views

Will htmlspecialchars (php) be enough for making secure PDF files with user entered data?

My app creates an PDF file and uses an user entered info. How can I avoid all attacks with PDF vector? Will htmlspecialchars be enough? I don't want to enable JavaScript in PDF.
2
votes
1answer
147 views

Is there a tool that puts on a webserver some .html or .php files filled with popular malware like java drive-bys or other browser exploit payloads?

As mentioned in the title I'm looking for a tool that puts on a webserver some .html or .php files filled with popular malware like java drive-bys or other browser exploit payloads? Maybe there is ...
5
votes
1answer
4k views

Is this jQuery ajax call vulnerable to XSS?

If somebody can edit $("#field").val(), can they change the url property here to point to another location? $.ajax({ url: "http://mywebsite/script?param=" + $("#field").val(), dataType: "jsonp", ...
4
votes
2answers
518 views

Can one get infected through visiting a site with a PHP script on it and if yes, how?

I can imagine a clientside JavaScript that gets executed in a vulnerable browser to do some harm, but how can this be done with PHP? Since it's serverside it shouldn't have access to the visitor's ...
4
votes
2answers
4k views

PHP Vulnerability May Halt Millions of Servers - max_input_vars!

Recent version of PHP 5.3.9 has been released a couple days ago, and Hash Collisions have been fixed, most of the servers actually didn't upgrade their server until now, including my website's server. ...
5
votes
2answers
4k views

Why don't we use MAC address instead of IP address?

I can use the system function in PHP to get the MAC address of site visitors (probably most of you know). Why do we use IP addresss to check whether someone is stealing a cookie or not? Does the ...
10
votes
2answers
3k views

Is strip_tags() horribly unsafe?

I always use strip_tags to prevent XSS attacks, but today I saw a post which was telling it's horribly unsafe. As the manual says, it doesn't check for malformed HTML! Is it true? What can I do to ...
13
votes
2answers
5k views

Multibyte character exploits - PHP/MySQL

Could someone please point me to a link with some information on multibyte character exploits for MySQL? A friend brought them to my attention, but I've not been able to find much information on the ...
5
votes
6answers
9k 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 ...
6
votes
2answers
839 views

DB Passwords: More Secure in a PHP App's .ini config files or apache2 environment variables?

I manage a php app whose key variables (such as database server addresses, DB user names and passwords, etc) change depending on their environment (Dev, QA, Production, etc.). In order to simplify ...
6
votes
7answers
3k views

Server compromised for 2nd time, cannot locate source of attack

I need some help tracing a vulnerability on my server. For the second time, my server has been compromised with files being replaced with virus-ridden downloads. According to the filesystem dates, ...
5
votes
4answers
1k views

Server wide javascript injection

UPDATE: The server was rooted, php.ini was replaced that cause the injection to appear. Still haven't figured out which directive is injecting the javascript. I'm troubleshooting a hacked website ...
6
votes
1answer
1k views

Do I have to make any more check if I use prepared statements for integers?

I am currently using PDO with prepared statements for some integer values (see PDO::PARAM_INT). That means I call PDO like this: $stmt = $conn->prepare("SELECT `lastMove` FROM ".GAMES_TABLE. ...
7
votes
3answers
7k views

PHP functions for preventing XSS

Is there a proven library with functions for preventing XSS attacks? Many people don't realise that htmlspecialchars is not enough to prevent XSS attacks. There are various contexts that need their ...
4
votes
3answers
642 views

PHP/JavaScript with RSA

I have a few columns in the database which should be encrypted. I'm wondering if the way I chose to make this system work is ok, and I'm looking forward to hear some opinions: I chose RSA algorithm ...
2
votes
1answer
746 views

Can suPHP lead to security issues due to hijacking people's accounts?

Bear in mind that, although I am pretty good at coding clientside javascript, I am not so great at dealing with serverside PHP. It doesn't help that there is very little information/tutorials/APIs on ...
6
votes
3answers
4k views

Does mysql_escape_string have any security vulnerabilities if all tables using Latin1 encoding?

I have heard that the PHP function mysql_escape_string has security vulnerabilities related to mult-byte characters. Are there any vulnerabilities if all tables are using Latin1 encoding?
3
votes
2answers
491 views

How can a cracker get past through this regexp?

I recently had a chat with a cracker and he told me that he can get past uri regexp checking. I'm checking if the path_info matches my regexp and after that I match that to my routing table. If there ...
25
votes
4answers
14k views

How do you know your server has been compromised?

I recently helped a client who had their server hacked. The hackers added some PHP code into the header of the homepage redirecting the user to a porn website — but only if they came from Google. This ...
4
votes
4answers
1k views

What security features should a PHP framework have?

What security features would you find useful or expect from a PHP framework? I have a PHP framework that I've developed that I'm going to be releasing as an open source project, but I want to make ...
6
votes
2answers
3k views

php.ini security setting after attack

My website have been attacked and I need a best practice for a php.ini I have done some reading but I am still not sure if I covered most of the options. here is my settings: file_uploads = Off ...
1
vote
1answer
279 views

Information on the phpMyAdmin probe?

Various IP addresses call various domains looking for various paths that might lead to PHP My Admin/scripts/setup.php One of those IP addresses is 74.63.212.48 which I just now found out I could ...
4
votes
2answers
2k views

How to find and protect against the exploited vulnerability in a PHP application based on the logged URL?

I have been attacked on a shared host server and they said I should configure my own php.ini file properly. I have a little PHP/MySQL program with a registering function, a little admin site. ...
11
votes
5answers
7k views

How safe is it to install XAMPP on my home computer to test PHP code?

I want to test some PHP code and I figure the best way is to install XAMPP - but I'm nervous about installing server software on my home computer. Is it generally safe to install XAMPP (given that I ...
4
votes
2answers
1k views

Are PHP Sessions based on cookies or a cookie-IP pair?

I have a PHP website and my question is: If someone manages to steal my users' cookies via an XSS attack, is it enough for him to be identified as the user? Or does his IP also have to be the same as ...
3
votes
2answers
1k views

Is this algorithm for a random string cryptographically secure?

I've pieced together this algorithm (if it can be called that) from various bits of code I've seen online, and I'm wondering how cryptographically secure it is. It's used to generate passwords: ...
4
votes
1answer
836 views

Which encryption algo should be best for an Android application [duplicate]

Possible Duplicate: Which type of encryption algorithms android supports, and which would be better? I am confused about to use of DES. Triple DES, RSA and AES algorithms, I think I ...
4
votes
2answers
5k views

Can DES-based hashed password be recovered if salt is known?

Can a hashed password be recovered if the hashing is done with DES based crypt function in PHP and both the hash and salt are known by the attacker? Consider the following example: $salt = 'mysalt'; ...
1
vote
2answers
197 views

TCrypto - Comments about design decisions I made?

I have pushed some code to GitHub to demonstrate the usage of symmetric key encryption in PHP. It is a small key-value storage library and it (optionally) offers ability to encrypt the stored ...
4
votes
3answers
485 views

How do I protect myself against the attacks in this php script?

Due to a vulnerability in how PHP was installed (Shared VPS with PHP installed as an Apache module instead of CGI) and hence how OSCommerce was configured (with security of 777 on certain ...
3
votes
2answers
921 views

list of web session attacks and counter measures

I'm writing a new website with php and I will be using cookies to track user session data. Before I finalise the design I want to make sure that the site is not vulnerable to attacks. I have written a ...
9
votes
2answers
1k views

Securing my web-server / website [closed]

Does anyone know of a comprehensive security guide about important basics / fundamentals which should be done to secure a web-server / website? A web link would do.
10
votes
1answer
428 views

Public XSLT & XML playground (with PHP DOMDocument, etc.) Security Risks?

Let's say I want to set up a sandbox or playground in PHP that users can use to create (or paste in) XML and XSLT, then transform the XML via the XSLT (by means of PHP 5's DOMDocument and related ...
4
votes
2answers
470 views

Attack vectors in POSTing variables from one php script to the next?

I have an application which is structured in the following way for its signup page. After this signup, the user is directly granted access into the system - there is no email verification (as ...
5
votes
6answers
1k views

How to defend vs. Image Remote File Inclusion, e.g. RFI using a .gif file (Apache/PHP)?

To defend versus Remote File Inclusion where attackers try to abuse image files, I usually recommend to never use include to include image files into PHP code. Sometimes though, the avoidance of ...
1
vote
2answers
1k views

Thoughts on Tiny Encryption Algorithm (TEA, anyone)?

I'm planning to implement Tiny Encryption Algorithm and exchange data between two PHP sites. Specifically, using the code presented at PHP-einfach.de Does anyone have any experiences / thoughts / ...