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

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5
votes
3answers
665 views

How do I make SQL injection harder but not impossible?

I'm doing a CTF application for my final year project. I wanted to craft a SQL injection flag but I don't wish that they can simply found out the SQLi vulnerability by injecting ' . Hence, is there ...
8
votes
3answers
19k views

Is there any SQL injection for this PHP login example?

I want to write a login form, and I got one example from the web. I want to know, if there is any SQL injection for this code? If there is, what could the exploit's web form entry look like? This is ...
4
votes
1answer
381 views

Exploited by newbie3viLc063s

My debian server got exploited by some scriptiekiddie who used Newbie3viLc063 http://pastebin.com/jma8JRG1 . Scriptkiddie uploaded logo_php.png to my server (My permissions sucked :s) and he did run ...
1
vote
2answers
165 views

secure certain data on my webserver

I've developed a website where people add their sensitive data. Not credit cards, but lets say they share things about themselves which are private and it wouldn't be good if other people see that ...
4
votes
3answers
878 views

Secure login system - using sessions?

I'm looking for a secure way to let users login on my website. Currently, I've always used a session system, like this: <?php session_start(); if (validPass() || isset($_SESSION['userId'])) { ...
3
votes
2answers
146 views

User privileges for unsanatized code

We all know there are still vulnerable code out there even though they may or may not get exploited and found for hacking attempts. I've seen people do it countless times and have a possibly plausible ...
2
votes
1answer
116 views

Securely store two values per user in SQL

I have come across the need in my web app to store two values for each user. These values would need to be retrievable from a value stored in a URL. I would prefer to store neither of the values in ...
2
votes
1answer
120 views

Mark parts of strings as unsafe?

Is there a smooth way to mark unsafe parts of a string? i.e. for use in SQL. example in php: someFunction("safe text" . $unsafeVariable . "safe text" . $anotherUnsafeVariable); Is there a smooth way ...
15
votes
4answers
2k views

What are the security threats of zip file uploads and what preventive actions should be taken?

We have a Drupal application developed for sharing files. We are allowing zip files to be uploaded by logged in departmental user. We are using Drupal private file system (outside webroot). We are ...
2
votes
1answer
458 views

XSS MySQL Database Accessible?

I'd like to know if there is any danger of someone being able to access the database via XSS vulnerabilities on this page. I have the following link. When you go to this link, the text I've enclosed ...
1
vote
2answers
507 views

How to stop a (malicious) endless loop

Few days ago someone tried to crack my site using a Remote File Inclusion attack. The attack was blocked by my Web Application Firewall, but I was curious about the file. So I downloaded it started to ...
2
votes
3answers
532 views

MySQL database access prevention

I am doing a PHP website for a client who deals with third party financial information, and he is concerned about the developmers (me) having access to all the information, which is obviously a valid ...
2
votes
1answer
2k views

ALERT - ASCII-NUL chars not allowed within request variables

In a Drupal site, I get this error in my Debian's syslog: suhosin[9413]: ALERT - ASCII-NUL chars not allowed within request variables - dropped variable 'name' (attacker 'x.x.x.x', file ...
3
votes
1answer
825 views

When checking a session variable to see if a user is logged in, is it enough to check to see if the variable is set?

When displaying a page with content only logged in users should see, I simply check if(isset($_SESSION['hasLoggedIn'])) { //show content } else { echo 'you must log in'; } In this article it ...
10
votes
3answers
14k views

Is it possible to execute a php script in an image file? [duplicate]

I have an image upload php website. Users can upload images to my website. A user claims he can hack my website using an uploaded image. I opened all the images that he uploaded to my server with ...
3
votes
3answers
653 views

Stop code injections into page code

I started a topic HERE on the stackoverflow site, but was refered here. I did get some info there, but think it need's more indepth input. So hopefuly people here can help. I have a few domains ...
20
votes
2answers
11k views

Risks of a php image upload form

So I have a client wants a photography site where users can upload their photos in response to photography competitions. Though technically this isn't a problem, I want to know the risks associated ...
2
votes
2answers
4k views

Proxy / VPN Quality Check / Detection

Is there any way to build a script which detects or rates proxies like Maxmind's proxy detection software? I have already tried to use this code, but it doesn't detect all proxies, in fact it detect ...
0
votes
2answers
198 views

how to find injected code in SQL

Recently one of my sites is hacked. The hacker used SQL injection to compromise the security. After getting SQL access he injected code in many places in database. I cleaned up many of them. But I am ...
6
votes
3answers
1k views

Setting a limit on password recovery attempts

in a setting where one has forgotten their password, I'd like to be able to limit the attempts of entering in email addresses to something like 10. My first thought was to use a cookie. $attempts = ...
1
vote
1answer
3k views

ASP.net vs PHP security? [closed]

I have been told that generally speaking, asp.net web apps tend to be more secure than php, since asp.net has some automatic security measures, for example, by default it doesn't allow remote file ...
0
votes
1answer
501 views

Is it secure to use a custom written Php extension for handling + hashing (db) keys?

I'm designing the security of a new application and try to figure out what the best way is to store the keys of the mysql AES encryption in the file system. I've seen several options like store it ...
-2
votes
1answer
724 views

Admin area in my php website is vulnerable to sql injection without login [closed]

my website admin area is vulnerable to sql injection . I tried using havji and it hacked successfully to database. But how is this possible. without login it breaked into admin panel. ...
17
votes
4answers
6k views

Is $_SERVER[ ] a safe source of data in PHP?

Can I 100% rely on $_SERVER[] to be a safe source of data that I do not need to sanitized like I do $_GET[] and $_POST[]? Thanks. OVERVIEW OF RESPONSES: So it seems there is a consensus that some ...
2
votes
4answers
620 views

When logging out of a website is anything else required then destroying the session?

In PHP, I'm not sure if I should start the session before destroying it when a user wants to log out. session_start(); session_destroy(); Is there anything else that needs to be done? EDIT: I ...
5
votes
3answers
719 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 ...
4
votes
4answers
941 views

Site constantly getting infected

I am the webmaster of some websites running Typo3, 2 of which are getting infected constantly. These 2 sites are being owned by the same client. Something happens on those 2 sites that causes ...
17
votes
2answers
1k views

PHP attack string in access logs

So one of the Invision Power Board installations on my server was recently compromised. I found what seemed to be the attack (using PHP in the query string and carefully crafted cookies), and I ...
4
votes
1answer
222 views

What are possible consequences for applications that depends on Safe Mode for security?

PHP finally removed safe_mode feature: Safe Mode Warning This feature has been DEPRECATED as of PHP 5.3.0 and REMOVED as of PHP 5.4.0. The PHP safe mode is an attempt to solve the ...
2
votes
2answers
870 views

how to bypass “header” in php

While reading an article I encounter an interesting thing I did not know about: if(!isset($_SESSION['usr_id']) || !isset($_SESSION['usr_name'])) { header('Location: index.php'); } ...Which ...
2
votes
2answers
617 views

How high is the entropy of this salt-generating code? (No code-reading actually necessary)

What is the best method? Assumption: I have a function that generates a number of medium-high entropy bytes Step1: I generate 3 of these medium-high entropy bytes. Step2: I hash these bytes using a ...
5
votes
1answer
382 views

Need to ephemerally store third-party password

One particular web service that I am writing interfaces with an API. Each API call requires the user's username and password to be sent, no state is maintained. Ideally, when using my web service the ...
2
votes
2answers
325 views

What are the security risks when users upload their HTML and javascript to AWS S3 and the content is used in a webapp?

I'm building this web app where users can login and build their own online presentation. To build the presentation they can use their own html, css and javascript. These user files are not uploaded to ...
1
vote
5answers
1k views

Site backdoor & eval()

I'm running a Joomla 1.7 site which was hacked today. Below script did the hack. ...
6
votes
1answer
3k views

My site just got hit with a SQL injection attack, how can I tell what they were doing?

So a page on my site (it's a PHP page that displays newsletter articles) was vulnerable to SQL injection and got hit. I discovered it because it was doing enough database queries to cause the CPU load ...
4
votes
1answer
1k views

CodeIgniter CSRF confusion

I have been working with CodeIgniter for about 3 weeks and am very well on the way to loving this framework. However I have been looking at the core code of the framework and I was reading over the ...
-1
votes
1answer
336 views

How Do Spammers Exploit Mailto Fields?

I was interested in finding out how spammers can target my Mailto link to send out spams. mailto:foo@domain.com?subject=foo Is it just a case of appending ?from=foo?to=victim1;victim2;victim3 to ...
1
vote
1answer
281 views

Getting hmac_sha to work between Erlang and PHP

I am trying to get an implementation based on the AWS signed http request API to work between Erlang and PHP. But I can't get it to work. The core approach is that you constructed a canonical version ...
-7
votes
2answers
629 views

PHP injection on 777 file [closed]

Some one has modified a PHP file, which had permissions set to 777, on my VPS server. How can someone do that without administrative access to the server? What information I can give you? I know ...
-1
votes
1answer
185 views

setting up website for logged in users, anyone, and files no one should see (via the web) [closed]

I asked how to prevent not logged in users from seeing certain content but the solution I chose to implement encountered a problem. I chose to make my root directory for the server C:\WAMP\www\public ...
3
votes
2answers
346 views

Fixing the high-bit problem in PHP's crypt() implementation

I'm working on a site that has to have compatibility with older versions of PHP, which suffer from a high-bit issue in the Blowfish crypt() implementation. Essentially, non-ASCII characters are not ...
3
votes
1answer
3k views

aes cfb 128 decryption /encryption problem between Erlang and PHP

Update 2 - it works Thanks to Tom Leek for his answer. The CFB mode of mycrypt for Rijndael uses a 8-bit feedback loop and not a feedback loop the length of the key/iv. You have to force it to use ...
4
votes
3answers
186 views

SQLi-protection ORDER BY

What would be a good check to remove all possibility of SQL-injection on an ORDER BY col where col is an unsafe variable? I'm currently removing [^A-Za-z0-9_] from the string in php. Is this too ...
2
votes
2answers
1k views

What vulnerabilities in the OWASP Top 10 are relevant to WordPress?

I have been looking at the OWASP Top 10, and am wondering which of the top 10 security risks are relevant to a WordPress installation with various plugins installed? I know injections and XSS are ...
3
votes
1answer
863 views

Are there modules to harden Symfony 2 sessions?

We're looking at building a new app on top of Symfony 2, but security is our top priority. After digging around a bit, it seems that there are a number of built-in options for Session management (eg ...
0
votes
2answers
525 views

What is the best way to generate keys in phpseclib?

I am using phpseclib implementation AES and HMAC. But I dont know the best way to create random keys for these. What is the best way to do? Is there any built in function in phpseclib to create keys ...
34
votes
1answer
4k views

default.php file found on the server, is this a security threat?

I found a file named "default.php" on the server with following code eval(gzinflate(base64_decode( ...
3
votes
1answer
2k views

I've heard that salt is not meant to be secret, but what if I made it secret? [duplicate]

Possible Duplicate: Password Hashing add salt + pepper or is salt enough? How to store salt? Ok I have been studying a lot about password hashing lately. And I have a few questions. So I ...
7
votes
2answers
2k views

Secure PHP upload form & storage

I am building a PHP application that allows uploads of files (.doc/pdf etc) for review by a staff member. Some of these files will be somewhat confidential so I need to protect them. Now the best ...
0
votes
2answers
343 views

CMS security issues

I have a desire to make my own CMS , to improve my programming skills. I would use PHP as a server side programming language. So my question is, on what security issues I must pay attention when ...