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What are the requirements for studying CEH?
Is there any requirements for the programming background?
And can anyone apply for it or does he has to have a recommendation for both studying and taking the test.
|
I am concerned about the use of bcrypt for client-side password generation. I am developing a password generation function to be used client-side, similar to PwdHash and PasswordMaker.
Much has been said about the advantage of using bcrypt over faster hash functions because it slows down brute force attacks. I know bc... |
I don't know why it seems IMPOSSIBLE to find a blog or any security expert explaining the procedure of how this 'hack' works.
My wife is receiving emails from people she's emailed through Gmail telling her that she they are getting spam from her email address (3 people, one forwarded the email with single link spam).... |
Is there any way to have a flash drive encrypted and it will only open with one computer that has the key in it?
|
I'm using the latest version of Firefox with Ghostery and Adblock plus installed. This website somehow prevents navigation away from it. How does it do this and how can it be protected against?
I can't even close the browser now.
http://www.imagesnake.com/ad.html
I didn't realize it at first as I was using Adblock Plus... |
I want to make sure my information is safe. This website is openly china-oriented but says to secure card information with Secure Sockets Layer technology (SSL) on those pages that involve sensitive information such as credit card numbers. Is this true, and is it safe enough? Thanks!
|
The issue started due to setting up a proxy server on a PC connected to my network. I then realized that all of my devices that connected to the network, including PCs and phones, are all infected by an ad bot that redirects me to ads websites whenever I click on any link. I then installed Malwarebytes, Adware Cleaner ... |
I am getting started in testing web applications, and I am having trouble verifying vulnerabilities.
It seems all modern browsers have protections against things like XSS.
When something like Burp finds an XSS vulnerability, I can't ever verify it when using something like TamperData. The code gets sent to the page, bu... |
I have Burp and Appscan telling me that Reflected XSS is possible due to a particular variable on a particular page.
The following example is given of what Appscan injected
'%252fmypage.aspx%253fHomeURL%253d%252fmyotherpage.aspx"/><script>alert(152695)</script>'
and what Burp injected
x.com/mypage.aspx?HomeURL=%2fmyot... |
I'm reading about Google OAuth and implicit flow. In Google docs it says that the access token received using the implicit flow must be validated otherwise the application might be vulnerable to "confused deputy problem." (https://developers.google.com/accounts/docs/OAuth2UserAgent#validatetoken)
I was wondering if som... |
Is it possible to use an open-source tool such as Cisco IPS or Cisco ASA to block incoming Teamviewer connections to specific internal IP blocks, while allowing the outgoing ones? I cannot find a specific answer on other online sources.
|
This article suggests that polygraphs are rather rudimentary and thus very susceptible to being 'beaten'. In pop culture we see all the time movies where polygraphs are beaten -but with great difficulty. Can this truly be done and if so, how difficult is it -does it take great skills and discipline to learn 'tricks' or... |
First of all I want to excuse for the bad spelling and grammar. English is not my mother tongue.
I have built a JSON communication between a front-end (website) and my Node.js web server. I want to keep in mind, that I might extend my front-end to mobile apps so I allow Access-Control-Allow-Origin: *. Now securing API ... |
We currently have what I believe to be a pretty standard scheme for dealing with password resets. Our reset links are single-use links: They expire immediately after they've been visited, even if the user doesn't actually reset their password.
However, our customers are predominately (99%) businesses with aggressive sp... |
I want to know whether is it possible to know the conversation/email sent via BCC can be identified by admin in some corporate companies?
I have heard that email sent from BCC cannot be identified, and I want to know how this BCC feature actually works.
|
Yesterday, Ars Technica posted an article explaining that Android was found to be vulnerable to a UI interference attack.
This claim originates from a paper published by Alfred Chen et al. of the University of Michigan a few days ago, which states that other operating systems are likely vulnerable to this same attack.
... |
Suppose you have a GUI application, that potentionally may be too curious about your environment, such as the list of window titles.
How do I limit application's ability to enumerate windows, capture unrelated input, access clipboard when not asked to, preserving most of normal activity?
How do I give partial, not ful... |
One of the things that has always bothered me about simple database data encryption: If the server is compromised, the database is effectively compromised. The attacker can use the same code as the app to query out the data as desired. A simple review of the app code will show where/how the key is stored and what the d... |
Looking at the Google geolocation API it claims:
Geolocation API returns a location and accuracy radius based on
information about cell towers and WiFi nodes that the mobile client
can detect.
Assuming a phone is in airplane mode or has no sim card and thus cannot connect to cell towers, and assuming that GPS is ... |
I recently recovered a zip archive with some files I need access to, but I can't remember the password. All I can remember is that the password was short (around 3-4 characters), and contained only lowercase characters and possibly numbers). However there is no Incremental mode for this particular situation in John the... |
Few different scenarios:
1a) On public McDonalds wifi, logging in gmail account (or any account such as skype). Can a random user who is using the same wifi somewhat intercept the signal and figure out the password?
1b) Same situation as above, except that gmail is already logged in and accessing gmail.
2a) On random p... |
A security conscious friend of mine was attempting to generate entropy using random dice rolls to generate a random password, and I became curious about the security of random number generators and whether or not she could do the same by simply thinking of random dice rolls. Would it compromise the security of password... |
I suppose this is related to What is an intermediate certificate authority? but I think my question is a bit different so I'll ask it anyway.
Why do most modern certificate authorities (e.g. VeriSign) require two intermediates? And if more than one is necessary for security purposes, why "just" two? Why not three? Or... |
We have a number of internal development environments that use weak passwords in the Auth and SQL components; particularly using passwords such as "password" or "Password1".
These are obviously changed for UAT and Production environments but how guilty should we feel about relaxing our habits for the sake of ease whil... |
I started looking at OAuth - Google's and Facebook's implementation. Both of the implementations, in the authorisation flow, seem to send the "Authorization code" back to the web browser. I was wondering what is the benefit of sending the code to the browser vs just hitting the redirect_uri from the authorisation serve... |
I try docker with a simple webapp :
docker run -d -v $(pwd):/app -p 8080:80 image_name
I have docker listen on 8080:
tcp6 0 0 :::8080 :::*
LISTEN 13304/docker
So I can test my web app through localhost:8080
I use iptables with UFW and I deny incoming except: 80, 443 and 22
But surp... |
Is it possible for the developer of an open-source software to hide a backdoor without getting caught?
Obviously open-source is superior to close-source when it comes to transparency, also I am aware of the fact that open-source does not necessarily means 0-day-free (if there is such software) but has it ever happened ... |
I have a scenario where I evaluate two different types of attacks on a distributed network of nodes (you may also call it a multi agent system).
On the one hand the attacker is able to read incoming and outgoing messages of nodes. That is called a sniffing attack.
On the other hand he may pose as is a valid node (going... |
I dialled a cell phone number and it rang but with no reply. I asked the person later why they did not answer and they said the Sim card was not in the phone. In fact, it was in a purse.... Is this possible? Can a Sim card that is not in a mobile ring?
|
I traced a header on an email I received, the person claims to have sent it from Maryland, but I traced the IP and it shows shows San Jose, CA and also contains loop backs, ??? Is this possible?
|
Per current security recommendations & browser support, is it okay to have an https iframe in an otherwise http-only set of pages?
Is this not a dupe? It is, but I want current trends because when I tested a few months back browsers warned me about mixed content, but now when I do an iframe of a secure login page overl... |
At work we use a central portal that provides basic SSO functionality to other applications. In addition to verifying the SSO data sent, all of our existing in-house applications (used by the public) also check the referrer header to make sure that the user is actually coming from our central portal. However, we just e... |
I am thinking about a creating short security demo to get people interested in the security topic. I've had a couple of ideas just want to see if anyone has anything else interesting.
Edit:
I was brought to my attention that this question is too broad and I will have to agree with this.
In order to narrow it down I wi... |
I work at a large university and have a computer supplied by my employer.
I would like to find out whether my employer is snooping or can snoop on my files or activity on my computer. Can I find that out? How would I go about?
There is apparently some sort of remote management that the help desk can use if I call them ... |
I just realize that this website knows the real ip address even if you use proxy ,i found this question, so start to test every possible way,first, this website don't have a X-Forwarded-For or X-Client-IP in its source code,second, this site don't just tell you are using proxy,it show your real ip address which it is n... |
If a WorPress application that uses the Akismet wordpress plugin has certain directory listing exposed publicly, like, akismet-en_AU.po and the other .po files, and directories like plugins, themes, uploads (primarily containing just image files) etc.only accessible,
should this be considered a security flaw ?
|
I'd like to use a key-value store (cassandra, redis, ...), but I don't trust the server.
The clients have a shared secret, and I'm using that to encrypt the stored values. But what is the proper way of encrypting the keys (not the crypto-keys, the key-value store keys)?
The store compares keys in queries, so each pla... |
Does anyone have any examples of real-life applications that doesn't require "strong authentication". I am looking specifically for blog posts or even scientific papers that argue that "strong authentication" is not required for all applications ... sometimes you need to authenticate users using IP addresses only, for ... |
The famous Mat Honan hack got me thinking about e-mail password recovery, and how any link in the chain can break all the links preceding it. In Mat's example, that link happened to be the last link, and the entire chain broke down.
Specifically, Mat used his GMail address as the recovery email for all his services, a... |
What options are available for transferring data between unix machines separated by an air gap?
USB flash drives
Optical media eg CDs and DVDs
Printed paper and Scanning+OCR
QR Code software, displays or printers, and cameras
Pen, paper and typing!
Smartcards / ISO 7816
Contactless / NFC / ISO 14443
Each of these hav... |
I am not sure how hashing works exactly, all I know it is impossible to reverse it.
All hash types have X amount of characters in them while the phrases and made up words can have an infinite quantity hence infinitely more times than the character counts in a hash.
So do hashes repeat themselves?
|
I'm making a website that has an extended forum feature, where users can login, post comments, etc. I'm making the feature where the website stores cookies in your computer so the next time you visit the website, it logs you in automatically.
I've heard not to store explicit username and password in a cookie. So I deci... |
It seems many sites use 3rd party flash ads, those ads could be design to attack user.
Do those site know which ads are safe or not? Or they just transfer any ads to user browser?
In general, how to know 3rd party ads are safe or not?
|
I would like to encrypt some authentication tokens using AES 256 (not tied to this algorithm but it seems to be a reasonable choice). These messages are usually very short at 128-256 bits. I'm concerned foremost about the security, not very concerned about ciphertext length or performance in either encryption or decryp... |
A very simple example...
<div id="cat"></div>
<script>
document.getElementById("cat").innerHTML = document.referrer;
</script>
or
<script src="' + document.referrer + '"></script>
I've tried simply sending the request and adding a referrer header, but that doesn't seem to echo onto the page.
|
When you encrypt your home folder in Ubuntu and Debian, it protects not only the file contents but also the file and folder names.
Yet I see that updatedb and locate works in Debian. When I run locate, it finds files that are in my encrypted home folder. Does updatedb store the unencrypted file and folder names of your... |
What I understand about reflected XSS is
... When a web application is vulnerable to this type of attack, it will
pass unvalidated input sent through requests back to the client... [1]
Assuming that my webapp has a CSRF validation on server that checks for a valid CSRF token for all requests. It will give proper e... |
Suppose as an attacker i want to carry out a Ping or SYN Flood attack..
I can change the source IP of the packets generated at my machine to a false/spoofed public IP address so that replies go to that spoofed IP to avoid detection.
A WiFi router or any device for that matter .. would it drop the packet if source IP wa... |
What is a good method to receive security alerts?
Email is the first thing that springs to mind, although it is susceptible to MITM attacks (e.g. an attacker preventing the email from being delivered). Although this is not really a practical attack as the MITM will not usually be suitably placed for this to work (often... |
I recently nuked my HDD(s) via a Windows program (Disk Wipe to be precise: http://www.diskwipe.org/), now everything is fine when I try to retrieve the information on that disk by any program I can find except for a couple of programs which have noted that the $RmMetadata folder still exists with files such as $TxfLog.... |
How can I prevent the installation of Chrome extensions on desktop?
|
Is there a way to disable the use of anonymous navigation window (an Incognito window) in Google Chrome for a computer?
|
Because Mylar does the decryption in the browser, the key is never stored on the server. Nice. This moves the threat to the browser, where, if the attacker is able to get a malicious script to be served to the browser along with the Mylar related app/data, then the script could just harvest the decrypted data.
So, how ... |
Hello my team is tasked to perform security focused training for developers (.NET and JAVA). I have used WebGoat to demonstrate OWASP Top 10 type security vulnerabilities and am looking for a similar tools / software to for demo and labs to cover security focused topics in .NET and Java. The goal is to show insecure co... |
My gut feeling is that the following should be attackable:
$("<td><a href=somefile.php?url="+encodeURIComponent(somevar)+">Download Here</a></td>");
In contrast to
$("<td><a href=\"somefile.php?url="+encodeURIComponent(somevar)+"\">Download Here</a></td>");
For a cross site scripting attack if the user has control ov... |
I am a bit confused about securing the secret encyption key. Here is the scenario:
I need to encrypt some data (file)
This data will be read by a program (say written in C/C++).
Both the program binary and encrypted data will be accesible to some arbitrary user.
However, in order to read the data the program needs ... |
Does multi-factor authentication provide any additional security benefits on top of doing a better job at correctly identifying and authenticating users compared to single factor authentication? In other words, if a system could perfectly identify users based on say biometric cues, is there still a need for additional ... |
As in md5(md5(md5(x)))...
I can remember coming across that in some piece of code. If the attacker can somehow reverse md5(md5(md5(x))) into md5(md5(x)) then he certainly can reverse md5(md5(x)) into md5(x) and the x. However if it takes some good amount of time to reverse the first hash then hashing the hash can slow ... |
I've noticed a brute force attempt on several different WordPress installs that know the right admin user name for those respective sites...
It seems very strange that the hacker would be able to find the username but not the password...
Furthermore, I've checked these WordPress builds, and I do not see where they are ... |
I'm working on a web app at the moment where we’re trying to remove any user friction and excess steps from our user creation page. To avoid computer bots completely spamming our app we need to have a some sort of CAPTCHA but this would take away from the main idea behind the app which is simplicity.
When looking throu... |
My apologies if this is too subjective, but I am looking for advice on best practices. We maintain a small program written in Python that runs on our customers' servers and communicates back with our servers. We are using Python's ssl module which relies on openssl to protect this communication back to our servers. ... |
What is the vulnerability level if the anti-csrf token is not sent with every post request? (If the vulnerability levels were high, medium and low). I understand for critical functions like login etc you would need to include csrf token.
What factors should I consider when deciding whether or not to implement CSRF for ... |
I use my MasterCard credit card for online transactions which uses SecureCode for preventing online frauds even though hackers knows our credit card details.
I have come across many sites which is asking me to enter SecureCode.
But recently i made one transaction in one online website, which is just taken my card detai... |
I observed that sometimes my facebook https connection changes to http after using the site for a while. Is it possible for ISP or somebody in between to do such a thing by throttling the net speed ? Or, how such a thing is possible ? I thought facebook, like google, is always https. Also, this happened when I have ins... |
VPNs are accessed by the user with credentials so that the information is encrypted. There are credentials that you download to allow this. Since you don't physically, in person get the credentials from the VPN provider they have to be downloaded which means using the internet. Now I know HTTPS is used but HTTPS is wea... |
I am running a scan against one of our servers from the Qualys SSL tester site and it says that my server "does not support forward secrecy with the referenced browsers". What exactly does that mean? My server is setup to use ECDHE_RSA_* ciphers which I know do support forward secrecy if negotiated and is recognized on... |
What's the difference between MITM attack and sniffing? Also could anyone name a few other attacks similar to those?
|
During manual SQL injection testing I came upon this.
Is there any way to bypass these filters that supposedly prevent a UNION based attack?
<?php
error_reporting(0);
include('db.inc.php');
$id=strtolower($_GET['id']);
$counter = 0;
if(strpos($id,"union")!=false){
$counter++;
}
if(strpos($id,"select")!=false){
... |
I'm actually interested about zero-knowledge storage system. Those system where the storage provider claims he can't have any access to the data stored.
As far I know, the data are encrypted using a symmetric encryption system, such as AES or another, But those systems need a key to function.
So what happens to the key... |
I work for a firm that has a marketplace on the web. We want to make a link with a token that stops an ad on the marketplace without the user being logged in.
Someone suggested that we make a token from this:
base64urlencode(md5("salt-adid"))
adid is information known by the user.
salt is just a secret word.
Given th... |
Kind of a silly question, but I'm genuinely curious: (in part because I recently saw several questions that refer to "nuking" a hard drive...) what would a microwave DO to an HDD? Would it erase data on there, or at least corrupt it enough that it's difficult to recover?
|
I just read the question: Does microwaving a hard drive erase it? and now I am curious too... does microwaving a CD (or for that matter, DVD, or blu-ray) erase it? My initial thought is that some data would remain, but that it would largely corrupt the data. Would microwaving the CD completely clear off any data thou... |
I have 2 or more web applications that need to be able to communicate together using a web service interface.
Information
All applications are using TLS/SSL (https)
All applications have access to the same database and that database can only be access by these applications
My problem is that I don't want anyone else ... |
If ISP blocks TLS channel while a user is using Tor, can he read the Tor traffic, since Tor uses TLS encryption ?
|
Can ISP block HTTPS selectively i.e. certain websites cannot be accessed using HTTPS while others can be ?
|
I want to run a TOR node using a small ARM device mini server. I already have a good firewall set but feel a bit uncomfortable when giving away my IP address to the open web by opening a port. If I use a VPN service would it help obfuscate my personal IP address? What are the implications if it does not?
|
I was reading hashcat's About page, and the stats are listed in terms of c/s....is that "Cracks per seconds"....the 'c' part seems wrong, I'm just guessing. What is 'c'?
|
I am in the current process of renewing my SSL cert for my website. I also have a mobile app for my site. I want to use the same cert from my website in my mobile app. How can I do this?
Thanks - I appreciate all feedback
|
I have a service with "try it now" experience that currently offers a "one click" effort.
This service has a pool of N resources (lets say 50).
Each new resource takes about 1 hour to generate.
How can this service be protected from a malicious user to empty my pool of resources?
We have circled around some suggesti... |
I know it's possible for a computer to be infected just by visiting a website. I also know that HTTPS websites are secure.
To my understanding, "secure" here refers to "immune to MITM attacks", but since such websites have certificates and such, is it right to assume they are "clean" and non-malicious?
|
I've been checking out various TLS certificates lately and noticed that most of the banks seem to have the following two issues:
1) They do not offer perfect forward secrecy
2) They are still using RC4
So far, all the ones I've checked (TD, JPMorgan, CIBC, Wells Fargo, Bank of America, ING/Tangerine, RBC) use
TLS_RSA_... |
For the early ChangeCipherSpec attack, the attack would affect client with all version of OpenSSL and server with OpenSSL version 1.0.1 and above.
My question:
If two mail servers are communicating with each other, would they be susceptible to such attack (assuming they are using OpenSSL version 1.0.1 and above)
Thank... |
I've looked around on Security.SE, but couldn't find much related to the following problem:
I recently signed up for Chase Quick Pay as my method of being paid by a part-time job. I've heard of stupid password requirements, but never stupid username requirements.
When I enrolled, I didn't really take into account how w... |
Does such attack exist? Forgive my wild imagination but is it possible for a hacker to pretend/try to communicate with a service on the server and when the firewall examines the traffic it get's poisoned or taken control of?
If such scenario exists what is the name of such attack?
To my understanding firewalls are unli... |
It's clear that someone listening on a network could still find out what website I visit over HTTPS (as discussed here) but what about when surfing in a VPN? What exactly can the underlying network (not the VPN host) see? Can it see what IP addresses (websites) I connect to whilst using a VPN?
|
I would like to make this story as short as possible since my question is not that long, I have worked with journalists previously in war zone where we investigated the involvement of EU IT companies in selling monitoring software to Dictator regimes owned ISP companies, One was a french company that I can't mention th... |
My question is about the difference between signing and encrypting.
Why would you still sign something if you are already going to PKI encrypt it?
Doesn't the PKI encryption inherently provide authentication, integrity and non-repudiation?
==added later===
What if I use my private key to encrypt my message. Then anyone... |
Does Shared key and Pre-shared key mean different thing ?
Currently reading Text , Security+ Guide to Network Security Fundamentals.
|
We have received the below finding from an IT audit.
Missing Secure Attribute in Encrypted Session(SSL) Cookie:
It is best
business practice that any cookies that sent over (Set-cookie) an SSL
connection to explicitly state secure on them
Can someone can explain what they are and how to secure them?
|
I'm trying to understand how null byte injection attacks in PHP code used to work before it was patched in PHP 5.3.4. I have this sample HTML page that is a somewhat modified version of what's shown here:
<?php
var_dump($_GET);
echo '<br>';
$file = $_GET['file'];
$path = '/var/www/' . $file . '.php';
echo $path;
if (fi... |
Let's say I have a system which use something you know, like a password, and something you have, like a code sent to a cell phone, to authenticate.
Is there a preferred order to ask for the password and the code?
Should it be the password first then the code sent to the phone or the opposite?
Edit
The answer should be ... |
At home, I have a simple ISP supplied router where I have set up a WPA2-PSK wireless network for our laptops and other devices. While I played around with Wireshark, I noticed that I could use my laptop to see what my tablet is doing in the internet, without the tablet noticing anything.
I think this works because all... |
I work as a tester at a VoIP software company. We've been running into a problem with using TLS to communicate with certain phones. The phones are from different manufacturers but both exhibit the same problem. To summarize as succinctly as I can, the phone is rejecting the certificate provided during SSL Handshake wit... |
So I found an interesting method of remembering those pesky security questions. Basically, the guy takes a hash of the question (IE what is your mother's maiden name?) and then appends his own password (I assume it is unique for each hash).
He claims this is a great way to always know the answer to your security questi... |
I understand that non repudiation intends to provide a mechanism that reliably proves that the sender of a message cannot deny sending the message. But does it also provide similar mechanisms to ensure the recipient of the message cannot deny receiving it.
|
I always thought it's possible to track attackers unless they try to hide their identities using some form of "physical" disguise. No matter how many proxies you use even TOR seems to be traceable by NSA but what about public WiFi networks?
Anybody can simply go buy a used laptop from Sunday market (MAC cant be traced)... |
I recently put a Linux server online and it didn't take long until I had the first attempts to brute-force the SSH login. It's not that I am worried about that - I trust the security of my server. But just out of boredom I looked up some of the originating IP addresses and noticed that almost all of them were Chinese.
... |
Our system used to get bombarded by bots trying to login to the ssh client on the standard port. After switching to another port number the failed login attempts basically stopped completely. Recently, in the past week there has been a few unknown i.p. addresses attempting to login ( on average about 60 attempts a day)... |
Aug 30 20:28:09 dropbear[6799]: Child connection from ::ffff:5.10.69.82:38463
Aug 30 20:28:11 dropbear[6799]: login attempt for nonexistent user from ::ffff:5.10.69.82:38463
Aug 30 20:28:12 dropbear[6799]: exit before auth: Disconnect received
Aug 30 20:28:12 dropbear[6800]: Child connection from ::ffff:5.10.69.82:388... |
Can anybody name all the risks of the following scenario:
User visits a page, but his session is expired, so he is auto-redirected to login page with his previous page and params added as a single parameter, encoded using PHP's urlencode():
https;//www.example.com/login.php?previous_page=%2Fdashboard.php
When logged i... |
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