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After watching Black Hat's presentation on the fundamental problems with USB "security", I'm wondering if there's a way to do USB whitelisting in Linux.
Is there currently a mechanism that will allow only a certain list of USB devices to actually load drivers and run on latest Linux kernels?
|
I may have been under the wrong impression on how servers should be setup and what certificates actually get sent over during the server hello certificate message. I came across this today from Symantec/VeriSign:
Root installed on the server. For best practices, remove the self-signed root from the server. The certifi... |
We're looking at hosting some of a client's existing applications in our environment.
My current thinking is we will have an encrypted channel back to the client's network over which authentication and authorisation (as well as user traffic) will travel.
This seems preferable to implementing my own IdM and then having ... |
We're looking to host a number of client applications in our environment.
Some of those will use crypto, e.g. for ssl or database encryption and obviously we'll need to manage keys for that.
I am not sure whether I should ask the client for keys, which we will then hold on their behalf; with all the problems of co-ordi... |
Context: I have a directory full of sensitive company files. I want to compare these files with a colleague at a remote location, without the need for a secure connection.
Is it safe for me to publicly publish a list of the SHA-1 hashes of these files?
I understand that it's impossible to reverse the hashing algorithm,... |
We currently run a Cisco ASA 5510 and a RSA token to authenticate users to our network for VPN access. The company is trying to start BYOD but would like to make sure that the PC has been approved by corporate before hitting our network. This is not something that is currently in place as anyone with an RSA token and U... |
I have an intermediate and a root PKI certificate that I see were already imported into a computers (windows server 2003) certificate store. However both the intermediate and root certificates were placed in the 'Trusted Root Certification Authorities' certificates folder.
That is obviously the appropriate place for t... |
I came to know recently that HSMs are used in credit card processing on the server side but since I don't work in that space and stumped as to why its needed.
I can see it used in an ATM machine - to encrypt data to be sent to the server for verification.
But once its already inside the firewall would I not just quer... |
I'm fooling around with Wireshark to capture the activation packets for an iPhone and some other stuff, however the traffic is encrypted. There should be a private SSL key somewhere on my computer to decrypt this traffic, but I've spent hours trying to find it with no luck. I'm on OSX Mavericks, latest iTunes build. I'... |
We run Exchange 2010. Our edge servers run "passive opportunistic TLS" for 99% of the domains we communicate with. For a handful of domains, we have forced TLS on both our end and the other domain's end.
We're in the process of deploying a secure email gateway appliance. It will basically park your email message on ... |
I can't get to upload the stager file on the OWASP BWA document root
(/var/wwww/WackoPicko/users). I am not sure how to troubleshoot this error.
root kali:~# sqlmap -u "http://x.x.x.x/WackoPicko/users/login.php"
--data "username=hacker&password=password&submit=login" --os-shell -v 1
--flush-session
sqlmap/1.0-de... |
I read about Chrome OS in the security section, and I was wondering what the meaning of "sandboxing" that they keep mentioning is. Is this sandboxing like Selinux or Apparmor ?
|
I have a Winforms app that users have to download and install on their machines. It connects to a WCF service(using SSL), hence requires the server certificate to be installed on users' Trusted Certification Authorities. Can anyone suggest the best practice for distributing a server certificate to allow users to downlo... |
I can see clearly how discretionary access control (DAC) works by checking the properties of a file on my MSWindows machine, the file has attributes and the owner of the file can do almost anything with it like making it available for everyone to read, transfer the ownership to an other user or even delete it
However I... |
As an 'extension' to earlier questions on this topic (for instance here and here),
What makes Firefox extensions (appear) more secure than Chrome extensions?
Do they just appear to be more secure, or are they really?
See also:
Why do Chrome extensions need access to 'all my data' and 'browsing activity'?
Worst case... |
Is it technically or theoretically possible for any part of a mobile phone's circuitry to be still on and transmitting even while turned off and the battery has been removed? If so, how?
I am thinking perhaps it could remain in a low power state and certain chips and capacitors could hold their charge for a while. Is t... |
I am currently beginning to studying the different security protocols and came across the SRP secure remote password protocol. I manage to understand the mathematic formulas behind it and the calculation but i do not understand the reason/purpose of using the "g" -> a generator of the multiplicative group.
Why is "g" a... |
Today malware is mainly spread thanks to vulnerabilities exploited in browsers and their plugins. The attackers use JavaScript to target those vulnerabilities. Two examples of such attacks are drive-by download and buffer and stack overflow attacks. What is the difference between these 2 attacks ? They seem to be simil... |
The only thing I know is that virus can get into the other programs and infect it whereas worms cannot attach itself to another program.
|
I have an application running on a server, that has an exposed socket to the Internet to communicate with client that is/are application(s) on a phone. How would one go about properly securing the access to the server, if one is not sure he could trust the client to store secrets?
What I mean by not trusting, is that ... |
Suppose I save content into the database after sanitizing it. Is there still a need to sanitize it again when retrieving it? If yes, why?
|
Recently, we've been asked by Audit Dpt. to have financial risks controls in our ERP (fraud-like incidents).
Our question is if this request is covered by the scope of Information Security Dept?
If so, I think a set of tests should be developed with IT and Finance Dpt.
So, What are the competencies of a Information Sec... |
If a company sends me a new password via SMS/email because I clicked "forgot my password." Does that mean the company is not actually hashing my passwords?
|
Two years ago a professional gang broke into the Bureau de Change next door during the night. One of the cameras was a small IP camera which I had advised them to install as I thought an off-site recording would be a good thing. However, they were so professional that they recognized the IP camera and covered their fac... |
Windows 8 requires Fiddler to set up an exemption when sending traffic to localhost.
Since this is a default setting (and affects many computers):
What security benefit does this provide
How can I list any exceptions that may be placed on my machine? (By Fiddler or any other similar software)
|
I am using OpenPGP and sending a signed, encrypted file with forced MDC (Modification Detection Code) over the network.
In typical file transfer scenarios where security is not in picture, an md5 checksum of file being transferred is sometimes sent along with the original file which can be useful for error detection by... |
I'm moderating a closed section of a forum - think 'covered by NDA' (not actually, but it's a good equivalent of the situation), with restricted access.
Sometimes we find screenshots from that forum posted by some rogue user anonymously in places where they definitely shouldn't appear. And the screenshots being anonymo... |
I'm building a small site which I would like to integrate with LinkedIn for authentication. LinkedIn says that redirect_uri's can be either http:// or https:// (not having to pay for a certificate is really awesome right now)
Upon reviewing the OAuth2 spec, I can't wrap my head around the possibility of exchanging a to... |
I use public proxies a lot. I was wondering, is it possible that they can modify the html and send back malicious javascript, etc?
|
It's not that difficult to reset the password of the administrator account in MSWindows when you have local physical access to the machine
Same thing applies on any Linux distro, it's possible to reset the root account password
This means without encryption you have no security what soever on your PCs unless you make s... |
We know that viruses and other threats can propagate through mail etc.But when any resource is shared,it is uploaded to the server and then shared.This means that the server does not take the responsibility of cleaning the uploaded files of viruses.Then how does it ensure self defense and secure the resources present o... |
Hello I want to know why this kind of example question never been asked before.
I got this code from my college that they say this kind of code is able to prevent SQL injection.
We use CodeIgniter to build a website and here is the code to prevent SQL injection.
Controller:
$usr = $this->input->post('userid');
$pwd = $... |
I wonder if the normal webmaster can get some information about SQL injection into their sites. I guess that it is written in some log, and only if you happen to see the logs you'll see that activity, am I wrong?
Should the attacker be using some TOR proxy in order to be hidden when performing some tests, or it isn't a... |
I am using the Scala Play web framework. In it, there is a PLAY_FLASH cookie used to flash messages to the user (it's a cookie so it will still work after several redirects).
I put HTML in the cookie so I can include links, etc.
Other details:
The cookie is not HTTPS-only.
I do not have a Content Security Policy.
I do... |
Let's suppose that I have a router and three computers connected to Internet through that router. When I tried to get the external IP address for each computer, I got the same address. I think this is due to NAT translation. I want to know how a hacker can scan a specific computer of the three computers using nmap a... |
For years, we've been receiving messages through our contact form in the following format:
name: vlsyekcz
email: jjthiy@toaagq.com
subject: BdsQiWYlYo
body: 2BLgIr <a href="http://aixfhxcynapd.com/">aixfhxcynapd</a>, [url=http://kfsriuqfsuer.com/]kfsriuqfsuer[/url], [link=http://lyiusjazrqvl.com/]lyiusjazrqvl[/link], h... |
I have setup a new set of servers to test a software in Amazon EC2, and had set up my application. I've given it public access and a DNS entry, so its easily reachable by those that need to test it out.
Today I've found the following in the application logs (beside from the regular application requests):
GET /manager/... |
Forgive me if this question seems a little "under the hood", but I think it's important to know from a security point of view.
I see SPOOLSV.EXE runs with print driver DLLs (Type 3 - User Mode, I know) loaded into the process under the security principal NT AUTH\SYSTEM. Doesn't this mean print drivers can pretty much d... |
Im using a website and somehow they can find out that i am using a proxy.
My first question is how can they do. How can they find out this? And Second what can i do i mean how can i hide my self, is there any way that i use proxy and they can not catch me?
what i think is they have some famous proxies's ip or whatever... |
We are implementing https with a third-vendor SSL library in our embedded system. Because of the chosen small public exponent in RSA 2048, encryption is much faster (approx 120ms) than decryption (approx 3100ms).
Could we exchange the public and the private exponent after key generation? That would shift the heavy lif... |
The same-origin policy is one of the most important security feature in our browser.
It basically provides sandboxing for our applications which is protecting our users.
Desktop application can read anything on your computer. If you install a malicious application by error, it might start reading files that you don't r... |
A few days ago I installed OSX 10.8 on a clean disk, and moved some of the old apps and data form the old to the new one.
I've noticed that Chrome exibited an odd behaviour: when clicking some links, it opened and immediately closed a new tab, then it correctly displayed the new page.
I've tried in incognito and it did... |
In an internal network, all machines are firewalled from each other. The firewall has port scan detection and blocking mechanism (say, psd module of iptables).
Question: What are the ways I can block internal port scans while avoiding DoS threat? Say, an internal attacker might impersonate/spoof the domain server's IP ... |
I have installed the "md5sum" utility on my Mac and there was also a "md5" binary pre-installed in /sbin.
My problem and question is this: "Isn't MD5 a standard algorithm?"
Because I get different hashes for a string using these utilities
Are there any differences in these utilities' implementations?
Example:
Mehdi-Mac... |
Why do some sites recommend "letters, numbers, and special characters" in a username or User ID?
When creating a User ID at the www.discovercard.com website,
the "User ID Strength" indicator meter bar indicates that a User ID is "weak" unless it includes letters, numbers, and special characters.
(It looks similar to th... |
If one uses a passphrase which is grammatical, such as "I put my keys under the doormat because they're safe there."... how many words (on average) must it contain to be as secure as a password with ~ 14 characters, such as 28fjha9;582g-jg ? (say we allow 26 lowercase, 26 capital, 10 digits and 10 punctuation, so total... |
Does anyone know what the status of the "Valicert Class 2 Validation Authority" root certificate is or what's going on with Valicert in general? I've heard that that cert has been deprecated, no longer honored, revoked, whatever. I got it from GoDaddy a while back and it cross-certifies to the Valicert root. It just se... |
I have a few questions, all relating to the title.
1) Is it possible to configure a server to receive the cookies using https but then serve all the content with http?
2) Does SE do this / do many sites do this?
3) Is it less costly on the CPU to only do the cookies over HTTPS?
4) Are there any security risks to doing... |
I started learning hobbyist penetration testing a while ago, and as far as penetrating a computer I have physical access to, all is good. Mainly using Hiren bootCD, it is easy to gain access to an local administrator account, if nothing else then through offline cracking of the poorly encrypted local passwords.
However... |
I am operating in a guest account of Windows 7.
Could an attacker that got onto my PC through malware I installed, install a video program that records everything I do and send the result back to his server without knowing my admin password in the first place?
The reason why I am asking this is that for some actions, i... |
So I understand roles vs permissions. I also understand roles vs claims. In both cases claims and permissions are granular, usually per feature or business operation such as AddPerson permission. I've been learning about claims based authorization and the examples that show how it's "better" and it's usually compari... |
The code that I have is:
<input type="text" name="some_name" value="<?php echo CHtml::encode($str); ?>" />
$str is the input data. 'CHtml::encode()' is Yii's way of encoding special characters into HTML entities. Can this be bypassed?
I know it can be broken if I do not put those double quotes around the input. But I... |
I have lost my modem to use the internet and I am starting university next week. There is Wi-Fi available to the students in the university, but I'm worried about the risk of using it.
Can other good computer students using the same Wi-Fi hack and see what I am using? If there is a risk, what should I avoid using? Is ... |
It's pretty common among security-minded folks to fill in addresses using e.g. foo+company@gmail.com when disclosing their email address to company so that they can tell if company has sold their address if they start getting spam.
But is it just me, or is this pointless? It literally takes only one regex substitution ... |
I read a recent article on a Chinese phone manufacturer on Wall Street Journal that says:
The rumors had begun when a user posted online in mid-July that his
RedMi Note smartphone was “secretly” connecting to a server in
Beijing, although he had turned off the data backup functions. The
server was connecting to... |
From: https://marc.info/?l=openbsd-announce&m=140752800525709
The announcement:
We have released LibreSSL 2.0.5, which should be arriving in the
LibreSSL directory of an OpenBSD mirror near you.
This version forward-ports security fixes from OpenSSL 1.0.1i,
including fixes for the following CVEs:
CVE-2014-3506
CVE-2... |
From the article LibreSSL's PRNG is Unsafe on Linux.
The first version of LibreSSL portable, 2.0.0, was released a few days ago (followed soon after by 2.0.1). Despite the 2.0.x version numbers, these are only preview releases and shouldn't be used in production yet, but have been released to solicit testing and feedb... |
I have come across the following question in a Security+ exam guide
You are tasked with creating a high-security authentication system for physical access control to a military installation. Which of the following authentication systems would be most appropriate?
Biometric eye scan
Security badge
Smart card and PI... |
Where can I find websites that perform drive-by dowload attacks ?
I need such websites in order to test a software that prevents such attacks. I am in the testing phase but I do not see where I could find such websites. Thank you for any help.
|
How can I protect the following code from CSRF?
$.post("lib/newEmployee.php",{employee_id: employee_id, employee_name: employee_name},
function (output){
//code
});
And here is my form (it is submitted after being validated with jquery validate):
<form id="new-employee" class="inline-in... |
Can a word document contain virus or harm you in any way? Someone sent me a word docx that has only 2 pages, no image but it's 1.7 MB big. If I use save as to save it with a different name but still docx than the duplicated document has only 35 KB. Is there something I'm missing? Can this happen normally? If yes, how c... |
As far as I understand if Dropbox wants to automatically run in the background without asking the user for a password it has to store the password somewhere on the harddrive and has currently no way to encrypt that password in a way that other applications can't read it.
As a result some security aware application ask ... |
The way I understand password security is that the user enters a password, which is then converted using a hash function. The website then compares it to the stored hash to see if it is correct.
That way only the hash is stored, so if an attacker learns that they don't have the original password. Where exactly is it ... |
Recently I read a few things about the BadUSB exploit, for example:
http://arstechnica.com/security/2014/07/this-thumbdrive-hacks-computers-badusb-exploit-makes-devices-turn-evil/
My understanding is that a device connected to USB can change its appearance (drive, keyboard, network card, ...), which opens the opportuni... |
There are some usernames that shouldn't be allowed to register on online services, for example:
administrator,
admin,
root,
system,
owner,
hostmaster,
webmaster,
sitename or
sitenameadmin
As far as I know, those shouldn't be allowed because they might cause a security risk, due to users registering those usernames migh... |
Ok lets say some one have clone my debit card here in Greece all debit cards have and stripe and chip and lets say in a way he knows my pin and all my information and he put the info on a blank card can he take my money? i repeate here in greece all banks have chip
|
I have a question. One of my colleague gave me a Smart Token which consists of public/private key inside and asked me if I can test its security. I said it should be tested in a equipped lab for passing FIPS standard tests. However I was wondering if I can test this token with some tools and check if it's secure. I sea... |
I am a little bit afraid about remote hacking, since I'm using a Windows 7. I see what a hacker can do if he exploits the DCOM vulnerability in Windows XP, but does this sort of exploit exist on Windows 7 or Windows 8? It other words, can hackers compromise a system with only knowing the IP address of my machine and ge... |
I have heard throughout the internet that English is incredibly redundant. So why do we turn English messages in to a cipher which is then, from my understanding more vulnerable to letter frequency analysis (LFA). I think it would be more vulnerable to LFA because someone trying to decrypt the message would only need t... |
If not, how is an ARP attack possible on a WPA2 secured network?
|
I understand you would not want to do this as it would limit compatibility for older devices and platforms. However if someone were in an all TLS1.2 environment, say a very well managed internal corporate network with all up to date browsers, is there any reason to keep TLS1.0 enabled?
|
About an hour ago, strange requests began showing up in my access logs. They are coming in at a rate of ca. 400 req/s and appear to come from IPs all over the place. It started out at a lover rate and has been increasing, which worries me. The requests look like this:
63.141.242.51 - - [17/Aug/2014:19:10:50 +0000] "GE... |
What information is kept in a linux file about the user and/or system that created it?
I want to make some files publicly available, posted on another server such as GitHub or FTP, but I'd rather the original user & system information not be included.
How can my intent be implemented?
|
In our company we have a procedure to verify internal worker but we cannot use it for temporary worker. We cannot use badges and because of privacy reasons we cannot use any photos. Is there any other way to authenticate them? For example I meet someone very late in the company building and nobody else is there. How ca... |
Is it bad practice if one uses the same email address on different sites and forums?
|
I am trying to learn securing wcf service using ssl. I found this website and I am following the steps. http://robbincremers.me/2011/12/27/wcf-transport-security-and-client-certificate-authentication-with-self-signed-certificates/. But when came to creating certificate step I had an issue. Using below to create a certi... |
OpenVAS reports that an Apache virtual host is vulnerable to CVE-2003-0042, which is a vulnerability in versions of Tomcat prior to 3.3.1a. The host is not running Tomcat.
The detection OID is 1.3.6.1.4.1.25623.1.0.11438.
Why is this vulnerability detected and how can I fix it? Is it a false positive?
|
I opened a web page using HTTPS.
When I looked at the page info provided by my Web browser (Firefox) I saw the following:
Connection encrypted: High-grade Encryption
(TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 128 bit keys).
I got a question - what does this encryption technique mean?
In an attempt to understand it I dec... |
In this image can someone tell me if a standard RSA certificate can support the EC*_RSA ciphers listed? If so do you create the typical RSA keys when you are creating the CSR?
Also I am fairly certain that the EC*_ECDSA ciphers require the use of an ECDSA certificate. Is that correct?
|
It has been one year since BREACH made our way into our hearts, and there does not seem to be any articles or posts or patches since then, is my Google-fu weakening?
Has BREACH been mitigated or patched in Apache/nginx?
Can we enable GZIP on SSL if we provide further protections?
|
Is there a kind of analysis which would enable me to get AES key which was used for encrypting arbitrary data while I have both original and encrypted version of data ?
The problem is that the AES key is burned into coprocessor but I have an interface to tell it to encrypt supplied data (therefore I can generate as muc... |
Recently while looking at several banking URLs I can see the domain name with security certificate at address bar and normal locker security certificate at address bar. Have a look at the screenshots:
Is it just an additional feature? What's the main difference between those two?
|
<div id="cat"></div>
<script>
$("#cat").html(location.pathname);
</script>
I think that example would work, but anyway, if location.pathname has to be a valid page, can this be exploited?
Edit: I'm mainly talking about if the user can't make up their own pathname, (i.e. /test/<script>alert(0)</script>).
|
This website blacklists URLs: http://hosts-file.net/?s=54.244&view=history&direct=1 Its last database update has been today. When I check the last 5 URLs it published Firefox tells me they are unsafe. But When I check those URLs on http://wepawet.cs.ucsb.edu/ it says they are benign. And when I run those URLs on my com... |
I have always wondered if penetration testing is a preventive or detective control. My view is that it is both preventive (preventive as it scans for vulnerabilities, which can be fixed to prevent cyberattacks) and detective (detects any vulnerabilities found on a system). Correct me if I am wrong.
|
In my nginx access.log I have plenty of request logs like this:
1.2.3.4 - - [18/Aug/2014:12:09:33 +0200] "-" 400 0 "-" "-"
As you see there is neither browser specification nor any target url. I am wondering whether they could be part of an attack scheme (what sort of?) and if so how best to counter them?
|
I downloaded the Windows installer (.exe) for ImageMagick via http (both http and ftp downloads are provided here).
Upon executing the file, Windows SmartScreen displays a banner across the screen saying "Running this app might put your PC at risk", so I decide to verify the published SHA256 checksum using the md5deep ... |
I use a Macbook Air 2013 and I recently noticed a very strange and long line of digits and letters under my "shared" category in finder. When I click on the name, it just says "failed to connect." It has a picture of a PC next to the name.
In addition, when my computer goes into sleep mode the screen saver says "test'... |
I have 2 SSL certificates that are generated and being used for our staging and development server.
However, we wish to change the roles of these two servers.
currently the staging server is using example.com domain and dev server is using dev.example.com domain.
So after the switch, example.com will go to the curr... |
This weekend I took part in an security challenge. I had great fun doing it but i found a huge gap in my knowledge that I'm really keen to fill and hope someone here can help get me pointing in the right direction.
Midway into the challenge I discovered 2 files that appeared to contain encrypted data, but i could find ... |
If I understand correctly, according to this: http://blog.ircmaxell.com/2014/03/why-i-dont-recommend-scrypt.html, looks like the attacker can just create an optimimized version of scrypt that produce the same ouput with extremely high effiency (e.g. with N= 2^14, p = 8, r = 1, requires only 1KB instead of 16MB to run, ... |
Let's say I have two Linux servers. One containing a desktop app database (running on a local network) and a webserver.
I want to automatically transfer each hour a database file (with a size of a few MB) from the local server to the web server to make updates.
The information needs to be encrypted and the server has... |
I understand that it is important to use well known and well tested hashing algorithms instead of designing my own. For such there often are reference implementations available, which initialize the needed constants with manually picked random numbers.
When I use such implementations, does it improve security to pick c... |
In a recent discussion somebody mentioned the following hashing scheme:
passHash = sha256(password)
saltedHash = sha256(passHash+passHash.substr(-10)
finalHash = sha256(secret+saltedHash)
The password is hashed, then hashed again with the last 10 characters of the previous hash as 'salt'. Finally a secret is appended ... |
Forgive me, as I am very new to cryptography, but it seems interesting, and I have a question.
I'll state my beliefs and please feel free to correct me on the aspects that I'm mistaken so i can learn:
Here's what I think I know:
When trying to protect a password, it goes through a hash function (i.e. SHA-1), and the r... |
I am building an API that returns data about companies
Multiple applications will access the API, some of these applications will have access to one company, some to multiple companies.
When a request is recieved for data, an ApplicationApiKey is also sent. I check if the ApiKey has access to the company data.
THis wor... |
I have suspicions that someone other than people on my team have obtained the credentials to remotely access a Windows 2008 Server. I need to get some evidence before I start pointing fingers or get everyone alerted that someone might be hacking our servers.
Can I get a log of all the computers that have remotely acces... |
I'm fairly certain I shouldn't commit certificates into source control. Even if the repository is private and only authenticated coworkers (for example) have access to it. That would allow for accidental exposure (thumb drives, leaked credentials, whatever).
But, how should I store and secure certificates? I don't supp... |
I am aware of the implications that hashing something more than once correctly will increase the security of a system, but doing it incorrectly will decrease it, as noted here and on various other sources.
But I stumbled upon a feature of Keepass, where the password database is encrypted N times to increase the work fa... |
I currently have a desktop application which requires the user to have a username and a password. These credentials are stored on a webserver (myserver.com), so when he types the username and the password and clicks on the Login button, they're sent to the webserver. If the credentials are right, the server will return... |
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