Application security - Specific to securing an application rather than the connection, infrastructure, browser etc

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Any flaws in this security model for a REST web service?

I have designed a REST web service which requires authentication. It handles authentication in a manner similar to Amazon Web Services, namely: the user has an ACCESS_KEY (say, 'abcd') and a ...
7
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5answers
760 views

Code Review Strategies

As per my information, there is no hard and fast rule for doing a security code review but we all develop our own strategy for the same. I was wondering if we all can share the different strategies ...
4
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1answer
121 views

Reading about security by design?

Security folks often encourage people to build security in from the start, and architect systems that are secure by design. What are some readings you would recommend for someone who wants to learn ...
25
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6answers
369 views

User input data, is filtering enough or should it be parsed?

In a webapplication there could be two approaches to migate XSS attacks. All the input data could be filtered (removing all 'bad' data), or the input could be parsed, tokenized and output with only ...
17
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4answers
11k views

How to hijack a session?

Despite the blatant title of the question, this is actually for a genuine purpose. My site uses PHP code like this: $select="select id from tableA where user_id='".$_SESSION['sess_user_id']."'"; ...
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7answers
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How to exploit the “PHP_MAGIC_QUOTES ON” vulnerability in order to cause max damage?

I've found a whole lot of SQL injection exploits in some systems I maintain. I know how to prevent the injection, but I would like to demonstrate to my CEO and CTO how dangerous it is if we don't have ...
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5answers
1k views

Code Analysis: Binary vs Source

While conducting a software security assessment, if you have access to the source code of a compiled application (say C++), would you ever do any analysis upon the compiled version, either with any ...
12
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2answers
437 views

Detecting website attack attempts

I am currently trying to implement some recommendations from OWASP AppSensor Project and I'd like to respond to attacker, when he tries to break into my website. Is there any resource ...
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4answers
1k views

What is the right way of storing database connection strings from the security point of view?

What are recommendations, best practices and have-to-dos regarding handling connection strings in web applications? What things one should never, ever do?
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3answers
646 views

Getting a manual security code review done - What to watch out for?

We have a PHP application that we want to get code reviewed from an external security consultant, but I'm not clear on "how to" go about that process. We did specify what kind of tests he should be ...
14
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3answers
492 views

Why CSRF Token has to be a Cryptographically Strong Random number, in Double Submit Cookies method?

I was just going through the OWASP's Cheat Sheet for CSRF Prevention. In the Double Submit Cookies method, I saw this the site should generate a (cryptographically strong) pseudorandom value ...
12
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4answers
560 views

What does defense in depth entail for a web app?

I'm assuming it means different layers of security from app-level security to server hardening to personnel training, but what are each of those layers and what are some good resources for each level ...
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2answers
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Is null-byte injection possible in Java filenames?

From the Area51 proposal
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5answers
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SQL Injection in a Non-Web Application

Does someone know of a good example of a SQL Injection vulnerability that isn't in a web application? What is the user input for this attack? I am looking for a real vulnerability, not speculation. ...
8
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6answers
713 views

What is preventing the widespread common use of MAC-type systems?

Overall question what is preventing the uptake of MAC systems such as SELinux/AppArmor in corporate and desktop computing environments? Why don't you think it isn't already widespread? I do not ...
8
votes
2answers
585 views

Recent Facebook XSS exploit details

There was a recent XSS exploit on Facebook that posted a vulgar message and got users to click on a link to spread the payload. What vulnerability was exploited, and what can other sites do to avoid a ...
8
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3answers
1k views

Practical non-government uses of Biba, Bell-LaPadula, etc. models

For example, the Biba model is now hanging out in current versions of Windows. Things downloaded from the Internet are tagged as such. Internet (low) stuff can't alter user (medium) stuff which isn't ...
4
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2answers
975 views

Code Injection detection on Web Servers

Recently I found one of my web servers hacked with malicious code injected to websites hosted there. It wasn't exactly my fault, as I shared the server with other people and someone put some unsafe ...
17
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4answers
2k views

What is the point of the same-domain rule for xmlhttprequest when script tags/JSONP can cross domains?

I get that I don't want a page loaded from stackoverflow.com to be able to request gmail.com on my behalf and read my email--but this seems to be simply a cookie issue. Since JSONP bypasses ...
13
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5answers
1k views

Is there any reason to show the same message for invalid username as password?

I've seen a security question/requirement that a website login return the same error message for invalid password as for non-existent user. The idea being that this it makes it impossible to discover ...
10
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7answers
645 views

IP address black list

My website has a black list of IP addresses. The web application, in some way, detects all invalid, suspicious influences to it and remembers IP address and denies any requests from that IP address. ...
9
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4answers
538 views

Worthwhile from security standpoint to limit database server user for ASP.NET website to only EXECUTE on stored procedures?

I know that obviously we must avoid sql injection attacks through user input validation and parametrized queries. There's already a firewall in place on the database server to limit remote ...
9
votes
2answers
1k views

Security Concerns on clientside(Javascript)

We are going to design and implement a UI for a big website. Owner of the site is really cautious about security issues. I wonder if there is a check list for security issues at the client-side ,while ...
8
votes
5answers
856 views

Scripting a search through php files for dangerous calls for manual review

I'm automating a script which searches through all php files on a big site for dangerous commands. The files which are found will be manually code reviewed. Does anyone have any recommendations for ...
7
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4answers
3k views

How to implement a “Remember me” on a mobile app?

I would like to implement a "Remember Me" time-limited auto-login type feature on a mobile application (on Android). To start the app, the user must type in a username and password. For convenience, ...
7
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4answers
2k views

Does default ModSecurity protect enough against XSS?

It's been a few years since I mucked around with modsecurity... Will simply installing the package with the default rules provide enough validation to prevent any (okay, let's be honest - best we ...
6
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3answers
176 views

How could one detect if Apple/Google/etc. has modified a third party application distributed through their App Stores?

Are there any realistic methods for verifying that Apple or whoever has not tampered with third party application distributed through their App Store? You might for example have an open source ...
6
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7answers
907 views

Should I prevent sending of GET requests for urls that are normally operated with POST request?

There is an url that is normally operated using POST requests (i.e. POST request is sent when user submits form). But attacker can form GET request with parameters that are sent in POST request. This ...
6
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3answers
278 views

How safe are copies of Firefox that are on various Mozilla mirror sites?

If I end up downloading a .dmg or .exe (depending on OS) installer from some mirror site, how can I be sure that a virus or trojan or spyware has not been added? I don't see any mechanism for ...
5
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3answers
330 views

What fraction of web sites are vulnerable?

It is known that security vulnerabilities are common on the web: many web sites are vulnerable. Is there any data on what fraction of web sites are vulnerable, and what fraction are secure?
4
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1answer
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how to secure Android Market public key

Android's security manual says that it is not safe to keep market public key just as a string and it should be hidden/encoded somehow. I am new to android Can somebody please provide me with example ...
4
votes
1answer
614 views

How to prevent CSRF if you want to include Flash plugins in your form like Uploadify in your form?

What is CSRF? I need a basic definition that is not just lifted from Wikipedia. I understand SQL injection, XSS, cookie poisoning, but I just cannot wrap my mind around this. I am using a ...
3
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3answers
1k views

AES for key encryption

Is AES a good choice for protecting a key stored on the computer of a user of my application? I have seen threads on hashing passwords that suggest using slow algorithms for defending against brute ...
3
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2answers
250 views

FrameBusting script

It is commonly known that loading your site inside a frame on another site, can potentially expose your site to all kinds of ills, and in general is not a good idea if you have any sensitive data to ...
12
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4answers
319 views

Sensitive information was placed in a publicly accessible folder. Who is responsible and how to proceed?

Background We have an IT staff who manages our server and a web developer who is not on the IT staff and has no root access to the server. All involved do very high quality work and I do not consider ...
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3answers
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How much does a security audit cost? [closed]

For a PHP CMS, what should I expect to budget for a security audit, both whitebox and blackbox? The codebase is about 85,000 LOC ("Lines of Code") and I would probably use a North American company for ...
10
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2answers
3k views

How to address XSS security issues in FCKeditor / CKeditor?

A security report we conducted through an outside company reported XSS vulnerabilities in FCKeditor which we're using in our PHP application. They pointed out that accessing URLs such as: ...
5
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2answers
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Canonicalization & Output Encoding

I'm reading OWASP's Secure Coding Practices Checklist and under their "Input Validation" section they have an item that reads: If any potentially hazardous characters (<>"'%()&+\\'\") ...
5
votes
4answers
351 views

What is the solution to Schneier's Law?

Schneier's law (which should probably be called Babbage's Law). States that: Anyone, from the most clueless amateur to the best cryptographer, can create an algorithm that he himself can't ...
4
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2answers
381 views

OWASP Top 10? How about OWASP Top 1000?

Many people are aware of the "OWASP Top 10". I'm wondering if OWASP (or any similar authority) has gone above and beyond just the top 10 most commons attacks and made a larger list (e.g. the "OWASP ...
4
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1answer
463 views

Does sandboxie “grab” all the system calls?

Sandboxie: http://www.sandboxie.com Does sandboxie "grab" all the system calls, e.g.: filesystem calls? Or it "grabs" all the low level calls from a process?
3
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3answers
120 views

Encrypting a fixed format message with commands and transmitting over the internet

Linked to: Encrypting a fixed format message? I need to communicate from Site A, a set of information that will be presented to users of Site A, which when they choose to submit, should travel to my ...
3
votes
3answers
1k views

Altering a $_SESSION variable in PHP via XSS?

Not sure if what I'm saying makes sense... but is it possible for me to alter a $_SESSION variable from outside the target PHP script? One of our scripts uses a $_SESSION variable and I'm not sure if ...
2
votes
1answer
668 views

Example of attack trees in the web application security analysis

Here I am again asking for some informations about attack trees usage in web application analysis. For my master thesis I decided to study the usage of this formalism in order to reppresent attacks ...
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vote
1answer
369 views

Web application software architecture: basic security

I am a complete beginner in the security topic and I know that I should read this, but I have a small question to which I hope exists a short answer. Let's say I have three components of a ...
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2answers
2k views

Should CSRF 'Double Submit Cookie' technique have a different seed value for the cookie versus the HTTP POST?

I'm reading about the OWASP double submit cookies method of protection and there it states that the cookie value between the header and form should match. That seems to be somewhat of a risk, as the ...
16
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3answers
1k views

Is it a vulnerability to display exception messages in an error page?

Our web application has an error page that displays the absolute URL path and query of the page on which the error occurred, the date/time of the error, and the exception message. (We do not display ...
12
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3answers
2k views

When using AES and CBC, can the IV be a hash of the plaintext?

[Originally on programmers.stackexchange.com with title: Can you encrypt with AES+CBC and search the encrypted data] Basically, I'm going to go with Advanced Encryption Standard with either ...
4
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1answer
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Are there any tools for automated penetration testing of Silverlight applications?

I'd like to find a tool to assist with automated penetration testing of Silverlight applications, in a similar vein to AppScan for webapps. Specifically, I'm looking for a tool that can cope with ...
4
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1answer
467 views

How does the “Service Identity” feature of Azure ACS compare (and contrast) to a real IDP?

It appears that the ACS has IDP-style features within the "Service Identities" section. How does the ACS treat these in comparison to a real IDP? What is missing? Some examples I'm thinking of ...