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  • What's the state of support for SHA-2 in various platforms?

    - by Cheeso
    I read that SHA-1 is being retired from the FIPS 180-2 standard. Apparently there are weaknesses in SHA-1 that led to this decision. Can anyone elaborate on the basis for that decision? Are there implications for the use of SHA-1 in commercial applications? My real questions are: What is the state of SHA-2 support in various class libraries and platforms? Should I attempt to move to SHA-2? Interested in mainstream platforms: .NET, Java, C/C++, Python, Javascript, etc.

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  • How to prevent a specific directory from running Php, Html, and Javascript languages?

    - by Emily
    Hi, Let's say i have an image uploader script, i want to prevent the upload directory from executing Php or even html by only showing it as plain text, i've seen this trick in many websites but i don't know how they do it. Briefly, if i upload evil.php to that directory, and i try to access it i will only see a plain text source , No html or php is executed. ( but i still want the images to appear normally ofcourse) I know i can do like that by header("content-type:text/plain"); but that's will not be helpful, because what i want, is to set the content-type:text/plain automatically by the server for every thing outputed from the upload directory except images. Note: i'm running php 5.3.2/Cent OS and the latest cPanel. Thanks

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  • How do I validate that my the openid.op_endpoint when a request is completed.

    - by Sam Saffron
    I have an Open ID based authentication system on my site. Occasionally users will have an account registered under [email protected] and they will attempt to login using the google open id provider https://www.google.com/accounts/o8/id, in this case I would like to automatically associate the account and log them in. When the process is done I get a payload from somewhere claiming that openid.op_endpoint=https://www.google.com/accounts/o8/id. My question: Can I trust openid.op_endpoint to be correct? Can this be spoofed somehow by a malicious openid provider? For illustration, lets say someone types in http://evil.org as their openid provider, can I somehow end up getting a request back that claims openid.op_endpoint is google? Do I need to store extra information against the nonce to validate? The spec is kind of tricky to understand

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  • Forcibly clear memory in java

    - by MBennett
    I am writing an application in java that I care about being secure. After encrypting a byte array, I want to forcibly remove from memory anything potentially dangerous such as the key used. In the following snippet key is a byte[], as is data. SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec); byte[] encData = cipher.doFinal(data, 0, data.length); Arrays.fill(key, (byte)0); As far as I understand, the last line above overwrites the key with 0s so that it no longer contains any dangerous data, but I can't find a way to overwrite or evict secretKeySpec or cipher similarly. Is there any way to forcibly overwrite the memory held by secretKeySpec and cipher, so that if someone were to be able to view the current memory state (say, via a cold boot attack), they would not get access to this information?

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  • How to control access to third party HTML pages

    - by Wylie
    Hello, We have a Learning Management System (LMS) that runs on its own server (IIS/Server 2003). Students must login with Forms authentication to gain access to the content. We want to offer access to third party flash and audio that is embedded in HTML pages hosted on the third party server (IIS/Server 2003). Currently we use a frame in a pop-up window that is populated via a simple URL to the third party HTML pages. How can the third party control access to their content, so that only students who launch the pop-up windows from our site can access their content? Since the content is mostly video and flash, we would prefer not to stream all of their content through our server to the Student. We have a programming staff, so we could maybe... - either post or get for our HTTP request to the third party server - we could use SSL - we could programmatically assign a global NT user account to all of our users and then do some kind of Active Directory login from the LMS server to the third party server - could the third party content be hosted at Amazon S3? Would this allow for secure access/download? These are just ideas. We really have no idea. Any suggestions would be greatly appreciated. TIA, Wylie

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  • How can we store password other than plain text?

    - by Eric
    I've found numerous posts on stackoverflow on how to store user passwords. However, I need to know what is the best way to store a password that my application needs to communicate with another application via the web? Currently, our web app needs to transmit data to a remote website. To upload the data, our web app reads the password from a text file and creates the header with payloads and submits via https. This password in plain text on the file system is the issue. Is there any way to store the password more securely? Thanks!

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  • Backdoor Strategy- opinion needed.

    - by the Hampster
    I'm creating an application to track publications and grants for a university. Professors will need to put they CV into the system when it is up and running. Yeah, right. The person in charge is planning on hiring someone to input all of the information, but my questions is how? The strategy I'm thinking of is to install a backdoor. The lucky undergrad can log in as any professor using the backdoor. Once all the data is removed, the backdoor can be removed. Doing so would probably be as simple as editing out a comment in the config file. The IT guys would still have access, but since they control the machines, they would have access anyway. Are there any flaws to this strategy?

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  • HTTPS-Compliant Sharepoint Web Parts

    - by bporter
    We are planning to create a new sub-site within our company's intranet site. The intranet is built on SharePoint 2007. My question is this: Suppose I want to add a 3rd-party weather web part to the home page of my new intranet site. Since the new site uses HTTPS, do I need to make sure to find an HTTPS-compliant web part? If I use a standard web part, will users get a "This page contains both secure and non-secure items" error message when they load the page? Thanks in advance!

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  • Preventing dictionary attacks on a web application

    - by Kevin Pang
    What's the best way to prevent a dictionary attack? I've thought up several implementations but they all seem to have some flaw in them: Lock out a user after X failed login attempts. Problem: easy to turn into a denial of service attack, locking out many users in a short amount of time. Incrementally increase response time per failed login attempt on a username. Problem: dictionary attacks might use the same password but different usernames. Incrementally increase response time per failed login attempt from an IP address. Problem: easy to get around by spoofing IP address. Incrementally increase response time per failed login attempt within a session. Problem: easy to get around by creating a dictionary attack that fires up a new session on each attempt.

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  • An old flaw in X Window System. How does it work?

    - by Legend
    I was going through an article today when it mentioned the following: "We've found many errors over the years. One of the absolute best was the following in the X Window System: if(getuid() != 0 && geteuid == 0) { ErrorF("Only root"); exit(1); } It allowed any local user to get root access. (The tautological check geteuid == 0 was intended to be geteuid() == 0. In its current form, it compress the address of geteuid to 0; given that the function exists, its address is never 0)." The article explained what was wrong with the code but I would like to know what it means to say that "It allowed any local user to get root access". I am not an expert in C but can someone give me an exact context in which this exploit would work? Specifically, what I mean is, lets say I am the local user, how would I get root access if we assume this code to be present somewhere?

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  • Is this safe on a production server?

    - by Camran
    I have a database application (or search engine) which is called Solr. I connect to it via port 8983. I do this from php code, so I add and remove records from it via php. On my server I have a firewall. I have set this firewall to only allow connections to and from this port (8983) from the ip adress of my own server. In other words, only allow servers IP to access this port. Is that safe? Or am I thinking all wrong here? Will others be able to "simulate" my ip adress and act as the server? This is because otherwise others may add/remove records as they want from their own ip adresses... Thanks

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  • Securing input of private / protected methods?

    - by ts
    Hello, normally, all sane developers are trying to secure input of all public methods (casting to proper types, validating, sanitizing etc.) My question is: are you in your code validating also parameters passed to protected / private methods? In my opinion it is not necessary, if you securize properly parameters of public methods and return values from outside (other classes, db, user input etc...). But I am constantly facing frameworks and apps (ie. prestashop to name one) where validation is often repeated in method call, in method body and once again for securize returned value - which, I think, is creating performace overhead and is also a sign of bad design.

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  • Hosting SQL at remote location?

    - by Syd
    Hey guys, My OSCommerce site includes a separately programmed feature for which I use SQL tables. I've decided to host its tables on a remote site offering free SQL accounts. I'd like to know if there could be any disadvantages to this approach. Thanks Syd

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  • Login form to an a secured app in tomcat

    - by patricio
    I have a normal HTML page in a normal Apache http server (http://yyy.yyy.yyy.yyy/index.html ), with an authentication form, with that form I need to access with the credentials to an application located in other server with diferent IP , that server have a secured application with tomcat: here is the login form in the apache http server: <form method="POST" id="theForm" action="http://xxx.xxx.xxx.xxx:8080/securedapp/j_security_check"> <input name="j_username" type="text" class="tx_form" id="j_username" size="20" /> <input name="j_password" type="password" class="tx_form" id="textfield2" size="20" /> <input name="btn" type="submit" value="login" /> </form> the submit only works random in chrome and dont work in IE and FF. im doing something wrong?

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  • Detecting use after free() on windows. (dangling pointers)

    - by The Rook
    I'm trying to detect "Use after free()" bugs, otherwise known as "Dangling pointers". I know Valgrind can be used to detect "Use after free" bugs on the *nix platform, but what about windows? What if I don't have the source? Is there a better program than Valgrind for detecting all dangling pointers in a program? A free and open source would be preferred , but I'll use a commercial solution if it will get the job done.

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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 to play music on site preventing direct file download

    - by Hugo Palma
    I'm starting a blog with a hosted wordpress instance and i would like to be able to stream music using a flash player on some posts. The problem is that every player i find uses a simple param to get the file url which makes it very easy for someone to find that url and just download the file. A server side solution can be implemented as i have full access to the server.

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