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

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2
votes
2answers
269 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?
7
votes
3answers
714 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 ...
1
vote
3answers
108 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 ...
0
votes
0answers
31 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 ...
12
votes
5answers
1k 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 ? ...
1
vote
1answer
93 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.)
0
votes
2answers
143 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 // ...
0
votes
2answers
141 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?
7
votes
2answers
196 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); ...
0
votes
1answer
86 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, ...
0
votes
1answer
221 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 ...
6
votes
1answer
145 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, ...
10
votes
3answers
446 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
votes
1answer
75 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 ...
5
votes
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 ...
1
vote
2answers
84 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, ...
3
votes
3answers
194 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 ... ...
2
votes
1answer
108 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
votes
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
votes
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 ...
1
vote
2answers
249 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 ...
3
votes
2answers
97 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 ...
1
vote
0answers
134 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"]); ...
7
votes
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 ...
3
votes
2answers
853 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 ...
1
vote
1answer
96 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 ...
3
votes
1answer
280 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?
0
votes
2answers
329 views

Was I a victim of an “Apache PHP Remote Exploit” attack?

I have a server in my computer for testing purposes, accessible from the outside. I was reviewing the access.log file, and I saw 89.187.33.50 - - [29/Mar/2014:03:39:01 +0100] "HEAD / HTTP/1.0" 200 - ...
1
vote
0answers
233 views

Do I keep my PHP simple auth session secure enough?

I'm experimenting with security, cryptography and web applications. My aim is to create simple login system that is realy secure enough. I'd like to share my approach to keep authenticated session ...
0
votes
1answer
128 views

What are common problems that reveal PHP code? [closed]

What is the best method for securing PHP scripts that contain database passwords? From what I've read, PHP can be revealed when an error occurs and is not caught. Is there any way to reveal PHP by ...
1
vote
1answer
143 views

WordPress Private Expoit? [closed]

I have a friend who said he has a private exploit for all WordPress ran websites. I asked him to take down my private blog, to see if it is real. He couldn't do it. I tried to get some more ...
-1
votes
1answer
65 views

session security in php

This has been asked a bunch of times. I am just curious to see if the below code provides a fairly significant level of security. are there any other if's i should consider? this is just an example, ...
2
votes
4answers
994 views

Malicious code in image. Harmful?

In my website, a user can upload his profile picture. After analysis of some pictures, I have found some pictures with malicious PHP code, just like the upload script. As an example, I have found a ...
-1
votes
1answer
86 views

Secure a string in PHP [closed]

What do you think it's the best method to secure a string in PHP? I speak of hiding its content and avoid malicious changes by the user, but be able to recover the information. We can use the ...
1
vote
4answers
147 views

What needs to be focused on when hardening a LAMP stack? [closed]

I have a site running on a VPS. I set up the LAMP stack and a few other programs personally. This is only the second time I have set up a VPS and I am a bit worried about security. Are there things ...
0
votes
1answer
507 views

Is it safe to store the reset password token in php session

I have a login system created in PHP. It currently doesn't have the Forgot Password ? feature and I would like to implement the feature. For this I'm planning to do the following : When user ...
1
vote
3answers
559 views

Email activation string with MD5'd random number and email secure?

For the registration on my PHP powered website, I require email confirmation. After a user registers, a string is generated with the following code and sent to their email address. $key = ...
2
votes
1answer
143 views

php crypt - trailing dollar sign - extract only the salt part from hash - padding the salt

I am reading up on PHP's crypt() function. I have a few questions on it - What is the significance of the trailing '$' sign at the end of the salt string that I see in most examples. The manual ...
-1
votes
1answer
577 views

MCRYPT_RIJNDAEL_256 max key allow? [closed]

maximun key for MCRYPT_RIJNDAEL_256 ? mcrypt_encrypt( MCRYPT_RIJNDAEL_256, <<==hash_hmac using sha512==>>, $text, MCRYPT_MODE_ECB, $iv ) Warning: mcrypt_encrypt(): Size of key is too large for ...
1
vote
0answers
734 views

blueimp jQuery-File-Upload getting PHP Hacked

I really like this upload package and want to use it, but from the time I set it up on my server, I've been hacked twice by something called the AnonGhost virus (anonghost.com). I tracked the ...
1
vote
1answer
203 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 ...
0
votes
2answers
126 views

Protecting the remote database against tampering in a mobile app

This is the first time I face a mobile app deployment at big scale. This app needs to connect to a remote server where to store and retrieve data. I discarded connecting directly to the MySQL ...
1
vote
1answer
199 views

Have I done enough not be compromised through image uploading

I know that you can never be sure that you have done enough to be secure, and I also know that file uploading is hard to make correct. Before asking this question I read some of the related posts here ...
0
votes
2answers
1k views

PHP encrypt and decrypt with certificate

I am trying to think of the best way to encrypt and decrypt a message between two servers. I have found a lot of examples where people simply use a secret and PHP's mcrypt... ...
0
votes
0answers
39 views

Storing hashed or encrypted password in session? [duplicate]

I need users to be able to encrypt and decrypt without entering their passwords every time. One way is to store the hashed password in session, and use it for encryption and decryption. Problem with ...
3
votes
1answer
170 views

How can I store information securely when I can't use crypt or a hash?

I'm creating an application for Google Glass (technically it's Glassware, but whatever). The user will do the following steps when going through setup for the Glassware: Go to my website, redirected ...
-5
votes
4answers
179 views

user authentication my method (reinventing the wheel) is this secure?

I have read many articles advising to use OpenID, including Stack Overflow Q&A, for authentication. Unfortunately I can't use openid because my auth is not based on an email id - it is based on ...
0
votes
1answer
179 views

False Positives- Server side protection against XSS

I read about XSS attacks and its prevention mechanism on server-side. It seems only protection is to sanitize the input by escaping special characters on server side (Using some PHP functions such as ...
1
vote
2answers
952 views

Possible attack on website

I am a developer and I therefor I have very little knowledge on security. So I need some help understanding the attack on website which we launched recently for one of our client. Website is built on ...
0
votes
0answers
19 views

Someone is making this request to the php cgi on by apache2 server, what does it mean do? [duplicate]

These are the query parameters the hacker is trying to POST: ...