3
votes
4answers
2k views

Can a CSRF CAPTCHA be defeated?

One defense that developers use to protect against a CSRF attack is to implement a CAPTCHA in critical steps. A CAPTCHA ensures that a human is at the keyboard approving the activity. But I've ...
3
votes
3answers
292 views

Modeling & Simulation: Do vulnerability-scanner software simulators exist?

In my research, i am attempting to develop a simulator that mimics the output of a vulnerability scanner, given a set of parameters (e.g., Network IP ranges, number of machines to scan, typical ...
10
votes
4answers
4k views

Is it safe to serve any user uploaded file under only white-listed MIME content types?

Let's say I develop an application that, Allows any user to upload a file of only white listed mime content type and extensions (word and pdf). Serves those files with the allowed extension and ...
5
votes
4answers
471 views

Personal Data Encryption Workflow

By personal, I mean for one person that's not sharing the workflow of data access with any other users. Appears based on the feedback I got on "is-hardware-based-disk-encryption-more-secure-that-...
2
votes
1answer
637 views

Large lan party : How to identify the users on the network?

I would like to know what are the good way to identify users on a large lan party when you manage network ? I had the idea to make the users register them self at a desk, they give us Firstname, ...
4
votes
2answers
4k views

Does Google record search / source IP [/ user] pairs?

Does Google record search / source IP [/ user] pairs? What if my Search History is off?
4
votes
2answers
6k views

Security Architect as a career path. How do i do it?

As it says, I want to become a Security Architect and I'm not sure of the career path to follow! I've already asked a few questions about certifications and got great help from this community. ...
6
votes
2answers
504 views

What should a Vulnerability Management System scan on a large scale

On a large scale (~1500 workstations, ~100 servers, ~50 network routers and switches, etc), what should a vulnerability management system be scanning? Should it scan everything, or just samples? I ...
5
votes
2answers
4k views

Tiger team versus red team?

What's the difference between a tiger team and a red team? Are there any other "color" teams out there (relevant to IT security)?
6
votes
3answers
679 views

Is it OK to use the same password for a Linux login and the SSH private key?

I want to remotely log in to my Linux server with SSH. Public/private key authentication is more secure than password authentication, so I have disabled password-based authentication for SSH on my ...
0
votes
2answers
199 views

Looking for information about the job from security consultants

I'm graduating with my bachelor's in computer science in December, and I'm looking to get an internship in a security consultant firm for the summer, or apply as an analyst/associate in October. I've ...
16
votes
4answers
4k views

Does Tor Hidden Service Protocol provide more threat protection than a standard HTTPS session?

DuckDuckGo is a search engine that has a Tor Exit Enclave and hidden service. This site is focused on the safe, secure searching of its users. Since DNS is not used in Tor, it appears that HTTPS is ...
0
votes
1answer
353 views

id-ce-cRLDistributionPoints ASN.1 / DER encoding question

I have a file - test.pem - with the following contents: -----BEGIN CERTIFICATE----- MBIwEKAOoAwwCqMIMAZhBEFCQ0Q= -----END CERTIFICATE----- openssl asn1parse -inform PEM -in test.pem -i returns the ...
12
votes
9answers
43k views

Programming language for network security

I am working as a tester now. I am planning to move to the domain of security such as a CEH or CISSP. But many say that to be a great hacker you need to know at least one programming language well. I ...
152
votes
11answers
57k views

Why are hash functions one way? If I know the algorithm, why can't I calculate the input from it?

Why can't a password hash be reverse engineered? I've looked into this ages ago and have read lots on it, but I can't find the explanation of why it can't be done. An example will make it easier to ...
4
votes
1answer
410 views

Tor: requesting a tor website

When you have a website that's hosted within the Tor network and one accesses this website with a Tor browser, does this person still use an exit-node ? Or will this be an encrypted connection ...
5
votes
3answers
364 views

Is “untrusted code” reported by DOM Snitch a vulnerability?

One of the most frequent errors that DOM Snitch finds in sites is Untrusted code. He finds it in google.com for example. Here is an output of this tool: Is it a vulnerability? Edit: This report of ...
2
votes
3answers
3k views

Firefox detected an invalid SSL certificate

February 14, 2012 UTC: Yesterday, I connected to a website of a VPN provider for which Firefox 8.0.1 on Windows 7 Ultimate x86-64 stated that its' SSL certificate is invalid. I saved the received ...
6
votes
2answers
9k views

Malicious users trying to create yahoo accounts with random emails at my domain?

Recently, I have been getting a string of emails from yahoo with people trying to create accounts or add email addresses @mydomain.tld to their account. I was wondering if anyone else has seen this ...
2
votes
2answers
7k views

How to improve performance of encrypted MySQL database on Linux backend server?

Is ezNcrypt's transparent encryption technology the only way to get a big boost in performance? Are there other good solutions out there we could be looking at for encrypting the entire database with ...
7
votes
3answers
6k views

Are fingerprint scanners easy to bypass?

Thinking about adding a fingerprint based authentication layer, but then I recalled the MythBusters beat fingerprint security system episode -- is this a common issue, and if not, how do you tell if a ...
3
votes
1answer
2k views

Is hardware based disk encryption more secure that software based?

As a spin-off of my question on "Advice on buying an encrypted disk" -- and in an effort to address the question "how is hardware based disk encryption better?" -- I've started a new question. My ...
5
votes
6answers
2k views

“Double hashing” with 2 different hash functions

Is doing something like this sha256(sha512(password+salt)) Less secure then just doing sha256(password+salt) I've heard it will increase collision chances. I can think of 3 reasons to do this ...
2
votes
2answers
322 views

OpenPGP: Sign-Verify workflow without Encrypt-Decrypt?

Is it a good and/or frequent practice to sign a file (with your own private key) without encrypting it (with the intended recipient's public key?) I haven't really been able to find a direct answer to ...
6
votes
1answer
2k views

iOS: Sandbox on jailbroken device

From my point of view and with my rather poor knowledge of iOS, the principle of a sandbox in iOS is the following: each app and its data is installed in a private area within the partition, but ...
4
votes
2answers
394 views

Advice on buying an encrypted disk

How do I find an encrypted disk to buy? What factors should I be aware of in selecting one? Is there any proof that buying one likely to draw any attention? How do I know there's not a backdoor?
4
votes
1answer
788 views

Help setting up Snort on Windows 7

I'm configuring Snort on Windows 7 with the help of this guy and I'm stuck at the following line in the config file: List of DNS servers on your network. I have multiple, how do I separate them? ...
4
votes
3answers
4k views

Which of these ports are safe to leave open, which are not?

I just ran nMap against my IP address and got the following result: PORT STATE SERVICE 21/tcp open ftp 22/tcp open ssh 23/tcp open telnet 80/tcp open http 443/tcp open https 3389/...
2
votes
3answers
562 views

Would a per-file encryption system any more or less secure than volume encryption?

Guessing they're the same, but not 100% sure. UPDATE: My mistake for not clearly stating the it would be assumed the keys per-file, or for a whole volume, would be the exact same -- not to mention ...
8
votes
1answer
304 views

What is the security vunerability in this scenario?

I saw this question: Suppose a university with address block 12.1.0.0/16 has a link connected to AT&T, where the AT&T router forwards packets destined to 12.1.0.0/16 to the university ...
3
votes
3answers
3k views

Writing a sample virus (not harmful)

I don't know if such a question is allowed on this site, sorry if it's not For educational purposes I am asked to write a small virus running on Linux, which should just be able to inject itself into ...
2
votes
2answers
854 views

Vulnerabilities and Threats to Non Web Based Windows Applications

I believe that most people here are familiar with OWASP and their Top 10 project. When it comes to information systems these days it appears that there is a big focus on web application security and ...
1
vote
2answers
989 views

http blocked over very low ports in Opera web browser

Opera blocks the user from making http requests over very low ports (below 1024). Why does Opera not allow the user to override this setting? What is wrong with running a web server on, say, port ...
5
votes
4answers
578 views

Is it harmful to redirect web bugs to localhost on hosts file?

I was checking the article hosts file on Wikipedia, and I found this: Blocking access to servers of unwanted content by redirecting them to the local host (127.0.0.1) may have security ...
4
votes
3answers
786 views

Access point fingerprinting

Does someone know of a project or a way to "fingerprint" an access point (a router)? Fingerprinting should be done irrespective of broadcastet BSSID and ESSID. BSSID and ESSIS may be included in the ...
10
votes
1answer
2k views

Effects of DDoS attacks on memory use under Linux

Can someone whose Linux system is under DDoS attacks give me exact data on the effects of the Low Orbit Ion Cannon (LOIC), the High Orbit Ion Cannon (HOIC), Slowloris, PyLoris, Hping etc. on memory ...
2
votes
3answers
12k views

What sites are still vulnerable to FireSheep?

Am doing a Firesheep Demo in a few weeks as a security awareness project. However I can't seem to get it working, and I'm wondering if it's just because the handlers it ships with are now outdated ...
0
votes
2answers
167 views

How much security should I use for my web application?

My question is, for a "normal" site, what do you think is enough to secure against methods used by "script kiddies"? For example, SQL injection, XSS, and stuff like that. Same question for password ...
2
votes
1answer
2k views

How can I tell if a DNSSec zone is protected using NSEC3 (versus NSEC)

This answer describes how DNSSec might permit "Zone walking"... where a bad guy can extract all the DNS records from a DNSSec enabled zone. NSEC3 is an update that prevents this. (See bottom of this ...
2
votes
1answer
900 views

question about implicitly tags in ASN.1

From the X.509 RFC, in the "Implicitly Tagged Module" section: CRLDistributionPoints ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint DistributionPoint ::= SEQUENCE { distributionPoint [0] ...
4
votes
1answer
5k views

Checklist for configuring WinRM Security settings on servers

WinRM has a very difficult to use command line interface and that leads me to believe some settings will be easily reconfigured, overlooked, and eventually exploited. In other words, insecurity ...
14
votes
2answers
1k views

What are prudent security precautions to take for business travel by people with access to sensitive info?

The New York Times had a front-page article today: Traveling Light in a Time of Digital Thievery, aka "Electronic Security a Worry in an Age of Digital Espionage". Former director of US national ...
5
votes
2answers
2k views

How does multi factor authentication modify the AD authentication process?

I'm trying to understand what would have to be updated to make Windows-based systems support multifactor authentication. Possible things that might have to be modified: Active Directory / Domain ...
8
votes
2answers
3k views

What are the dangers of storing webserver temp files in the /tmp/ folder?

I have configured my first publicly accessible nginx server. I have configured it to use a /tmp/nginx folder to store temp files. This includes the body of http requests, proxy files etc. The /tmp ...
8
votes
5answers
3k views

Which is the most vulnerable to MITM attacks, SSL or SSH?

Which is the most vulnerable to MITM attacks, SSL or SSH? Here's the scenario, you have 20 minutes to set up a web proxy like this: Laptop -> Chrome Browser -> Web Proxy -> Internet You must secure ...
5
votes
1answer
394 views

What is the security impact of changing PowerShell's PSLanguageMode?

A vendor is asking me to change the PSLanguageMode from within IIS on my Exchange server(s). What potential vulnerabilities am I opening myself up to? I'm surprised to see this option present within ...
6
votes
3answers
7k views

How to scan USB drive with clamav on Linux

Is there a way to scan the entire drive including auto-run and all partitions, including the master boot record (MBR)?
1
vote
4answers
810 views

Completely wiping a HDD (i.e. nothing is recoverable) [duplicate]

Possible Duplicate: How can I reliably erase all information on a hard drive? I'm looking to see if there's a method that can completely wipe out the content of a HDD, so that nothing ...
1
vote
1answer
331 views

Should I mount my mac Truecrypt Volume elsewhere?

I've read in various places to not mount your truecrypt volume in the same place as your Dropbox or Sugarsync folder. I believe this only matter for Mac/Linux, but I need some verification. On a Mac, ...
0
votes
1answer
566 views

How does FileVault 2 work with multiple decryption keys?

With FileVault 2, you can encrypt the hard-drive such that users on the computer can decrypt it with either of their passwords How does this work?

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