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  • Block upload of executable images (PHP)

    - by James Simpson
    It has come to my attention that a user has been trying to create an exploit through avatar image uploads. This was discovered when a user reported to me that they were getting a notice from their Norton Anti-virus saying "HTTP Suspicious Executable Image Download." This warning was referencing the user's avatar image. I don't think they had actually achieved anything in the way of stealing information or anything like that, but I assume it could be possible if the hole is left open long enough. I use PHP to upload the image files, and I check if the file being uploaded is a png, jpg, or gif.

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  • All PHP files getting hacked

    - by nsearle
    Hey All, Like always, just want to say thank you for all of the help and input in advance. I have a particular site that I am the web developer for and am running into a unique problem. It seems that somehow something is getting into every single PHP file on my site and adding some malware code. I have deleted the code from every page multiple times and changed FTP and DB passwords, but to no avail. The code that is added looks like this - eval(base64_decode(string)) - which the string is 3024 characters. Not sure if anyone else has ran into this problem or if any one has ideas on how I can secure my php code up. Thanks again.

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  • How to Check Authenticity of an AJAX Request

    - by Alex Reisner
    I am designing a web site in which users solve puzzles as quickly as they can. JavaScript is used to time each puzzle, and the number of milliseconds is sent to the server via AJAX when the puzzle is completed. How can I ensure that the time received by the server was not forged by the user? I don't think a session-based authenticity token (the kind used for forms in Rails) is sufficient because I need to authenticate the source of a value, not just the legitimacy of the request. Is there a way to cryptographically sign the request? I can't think of anything that couldn't be duplicated by a hacker. Is any JavaScript, by its exposed, client-side nature, subject to tampering? Am I going to have to use something that gets compiled, like Flash? (Yikes.) Or is there some way to hide a secret key? Or something else I haven't thought of? Update: To clarify, I don't want to penalize people with slow network connections (and network speed should be considered inconsistent), so the timing needs to be 100% client-side (the timer starts only when we know the user can see the puzzle). Also, there is money involved so no amount of "trusting the user" is acceptable.

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  • how can I reliably check that requests to my service file have come from my website?

    - by woot586
    I have a service.php class that I use to service AJAX calls from my website. To prevent other people accessing the service using PHP CURL I would normally check the request has come from mysite, and if they are not then just redirect to my home page e.g. if($_SERVER['HTTP_REFERER'] != "http://www.mysite.com"){ header('location: http://www.mysite.com'); exit; } I read in the PHP holy bible: http://www.php.net/manual/en/reserved.variables.server.php that "Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature. In short, it cannot really be trusted." So if this method is not reliable, my question is how can I reliably check that requests to my service file have come from my website? Thanks for any help you can provide!

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  • Is there any way to view PHP code (the actual code not the compiled result) from a client machine?

    - by Columbo
    This may be a really stupid question...I started worrying last night that there might be someway to view PHP files on a server via a browser or someother means on a client machine. My worry is, I have an include file that contains the database username and password. If there were a way to put the address of this file in to a browser or some other system and see the code itself then it would be an issue for obvious reasons. Is this a legitimate concern? If so how do people go about preventing this?

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  • Strongest cipher available to use with C/C++ ?

    - by George0x77
    I am just wondering if you are supposed to write a sort of really secure application with data being transmitted over insecure networks, what kind of encryption algorithm will you use it in order to make it safe ? I know several c++ libraries for encryption providing nice functions with different algorithms, but i'm not quite sure which cipher to use - AES, DES, RSA, Blowfish or maybe something more different ? Please provide your ideas and suggestions. Thank you.

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  • Ways to restrict WCF Service so only our apps can access it.

    - by RP
    I have a public WCF Service. I have a WPF Desktop app & a silverlight app. My apps does not have any login requirements. I want to make it difficult for another developer / website to make use of my service. What's the best way to restrict access to my service? Use SSL and have the desktop / silverlight app store a token inside of it?

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  • Email server; Is this method spam-safe?

    - by Camran
    I have a classifieds website, and on each classified there is a tip-form where users may tip a friend about the classified. The tip-forms' action is set to a php-page, which mails the email after sanitizing etc... I have to filter away spam etc so that my email-server don't get blacklisted or anything... I have my own server (VPS, Linux) and have thought about a solution... How does this sound to you: 1- Install a mail-server 2- Configure Firewall to ONLY allow connections to the mail-server from my website 3- Configure the mail-server so that a maximum of 'x' emails may be sent every 5 minutes or so 4- Create a php filter before sending the mail, which checks for 'bad' words. 5- If necessary, as last resort, ask the user a question (ex 5+5) before submitting form I would rather preferr if I didn't have to implement the 5th implementation above... What do you think? Also, another q I have that you may answer is: If an email-server gets blacklisted, is there any way to un-blacklist it? Or whats the solution if this happens? Thanks

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  • SQL injection attempt on my server

    - by Jan Kuboschek
    I know a little about SQL injections and URL decode, but can someone who's more of an expert than me on this matter take a look at the following string and tell me what exactly it's trying to do? Some kid from Beijing a couple weeks ago tried a number of injections like the one below. %27%20and%20char(124)%2Buser%2Bchar(124)=0%20and%20%27%27=%27

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  • Why can't we just use a hash of passphrase as the encryption key (and IV) with symmetric encryption algorithms?

    - by TX_
    Inspired by my previous question, now I have a very interesting idea: Do you really ever need to use Rfc2898DeriveBytes or similar classes to "securely derive" the encryption key and initialization vector from the passphrase string, or will just a simple hash of that string work equally well as a key/IV, when encrypting the data with symmetric algorithm (e.g. AES, DES, etc.)? I see tons of AES encryption code snippets, where Rfc2898DeriveBytes class is used to derive the encryption key and initialization vector (IV) from the password string. It is assumed that one should use a random salt and a shitload of iterations to derive secure enough key/IV for the encryption. While deriving bytes from password string using this method is quite useful in some scenarios, I think that's not applicable when encrypting data with symmetric algorithms! Here is why: using salt makes sense when there is a possibility to build precalculated rainbow tables, and when attacker gets his hands on hash he looks up the original password as a result. But... with symmetric data encryption, I think this is not required, as the hash of password string, or the encryption key, is never stored anywhere. So, if we just get the SHA1 hash of password, and use it as the encryption key/IV, isn't that going to be equally secure? What is the purpose of using Rfc2898DeriveBytes class to generate key/IV from password string (which is a very very performance-intensive operation), when we could just use a SHA1 (or any other) hash of that password? Hash would result in random bit distribution in a key (as opposed to using string bytes directly). And attacker would have to brute-force the whole range of key (e.g. if key length is 256bit he would have to try 2^256 combinations) anyway. So either I'm wrong in a dangerous way, or all those samples of AES encryption (including many upvoted answers here at SO), etc. that use Rfc2898DeriveBytes method to generate encryption key and IV are just wrong.

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  • Is it possible to password protect an SQL server database even from administrators of the server ?

    - by imanabidi
    I want to install an application (ASP.Net + SQL server 2005 express) in local network of some small company for demo but I also want nobody even sysadmin see anything direct from the database and any permission wants a secure pass . I need to spend more time on this article Database Encryption in SQL Server 2008 Enterprise Edition that i found from this answer is-it-possible-to-password-protect-an-sql-server-database but 1.I like to be sure and more clear on this because the other answer in this page says : Yes. you can protect it from everyone except the administrators of the server. 2.if this is possible, the db have to be enterprise edition ? 3.is there any other possible solutions and workaround for this? thanks in advance

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  • Is there a way to test my nonce validation fails when it should?

    - by MrsLannister
    I'm using nonce validation in a wordpress plugin. When I submit the form from the admin menu it processes correctly, so I believe the nonce validation is working. What I'm not sure is if the validation will fail when it is supposed to and I don't know what the best way to test this is. I tried putting the url for the php file in directly, but all it does it take me to a wordpress not found page. Is there some recommended way to test this? Here is my code. Again, the test passes when it is supposed to, I just don't know if it fails when it is supposed to. if ( !wp_verify_nonce( $ecbs_post_data['_wpnonce'], 'ecbs-edit-templates' ) ) { wp_die( __( 'You do not have permission to update this page.' ) ); }

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  • Url rewriting : prevent to display xml

    - by Frank
    Edit : I've got an aspx file (default.aspx) that loads a flash file (index.swf), but this swf needs a xml file (foo.xml) to load correctly. However, I would like to block any request aiming directly at the xml file. Is it possible, using a rewritting engine (isapi_rewrite for example) to detect if the xml file is being 'hotlinked' or being loaded by the 'index.swf'(inside default.aspx)? Any ideas? Thank you.

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  • How can I cut down on this spam, and what is the point of it anyway?

    - by Steven
    I run a small, niche personal ads site. People post ads and then other people reply to them, which sends an email to the original creator of the ad telling them that someone is interested and giving them contact information for that interested person. Lately there's been some weird spam. People are receiving nonsense replies to their ads. Here is an example of one: Name: xkauwvyr Reply: vRYmbI <a href="http://rypmoxdkfblf.com/">rypmoxdkfblf</a>, url=http://pnjlwvhizwbq.com/]pnjlwvhizwbq[/url], [link=http://hmenwoujxrfv.com/]hmenwoujxrfv[/link], http://ogsekuhoyeud.com/ They vary in length and composition but they all look roughly like that. The first idea I had was to simply throw out any reply that contained the string " Also, is this spam just some ass playing a trick on my website, or is it something more malicious?

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  • Authentication Sceme for RESTful API used by desktop app.

    - by user346087
    I'm providing a RESTful API. This API is used by a third party desktop application. The API is currently secured using Basic Authentication. That isn't very secure because the credentials have to be stored in the client application. The communication between the desktop and API can also easily be intercepter. The desktop application also communicates with a third party server (run by the publisher of the desktop application) I am unable to figure out how the secure the API in a good way. Ideas?

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  • Best practice for secure socket connection.

    - by LnDCobra
    What is the best practice for a secure socket connection (without SSL). I will be moving sensitive data (logins/passwords/accounts) across TCP Socket connection, and wondering if there is a good/fast way of Encrypting/Decrypting and avoiding malicious injection.

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  • Why not use HTTPS for everything?

    - by Malfist
    If I was setting up a server, and had the SSL certificate(s), why wouldn't I use HTTPS for the entire site instead of just for purchases/logins? I would think it would make more sense just to encrypt the entire site, and protect the user entirely. It would prevent problems such as deciding what has to be secured because everything would be, and it's not really an inconvenience to the user. If I was already using an HTTPS for part of the site, why wouldn't I want to use it for the entire site?

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