An attempt by a threat to exploit a weakness in a system.

learn more… | top users | synonyms

5
votes
3answers
705 views

TLS Renegotiation Indication Extension vulnerability

I am trying to understand the TLS Renegotiation Indication Extension from the RFC. I can understand that it is related to the fact that the renegotiation is sent under the encrypted stream, but I ...
0
votes
1answer
61 views

How much harm can an attacker do on the Diffie-Hellman exchange?

I'm looking at a system that uses an unprotected Diffie-Hellman exchange to negotiate a key for the session encryption. That Diffie-Hellman is not secure against man-in-the-middle attacks is textbook ...
1
vote
0answers
106 views

Disable HNAP on D-Link router

I'm concerned that Home Network Administration Protocol (HNAP) is a serious vulnerability that exposes consumer network routers to remote management by malicious entities such as government ...
2
votes
1answer
113 views

Why would an attacker try to guess random email usernames on a small domain?

My mail server has recently come under a very bizarre attack. Every five to ten minutes, a new IP connects to SMTP, attempts to try weird usernames (like pil, bennett, netscape, msfuser, desktop, ...
16
votes
5answers
1k views

Rainbow table concept for Prime numbers

Is there a concept where pre-computed tables can be used for prime number factorization ? Is it possible that a computer can generate millions of prime numbers, store it and then effectively determine ...
5
votes
2answers
235 views

Zlib DEFLATE decompression bomb

Can you give me an example of a short data string that, when decompressed using Zlib's DEFLATE method, expands to something much much longer? More precisely: what is the nastiest decompression bomb ...
0
votes
1answer
119 views

Using Gmail in China triggered lots of Two Factor SMS

A friend of mine lives in Hong Kong and she travelled to China over the weekend. Whilst there, she was able to use Gmail on her Android phone without logging in again, but she had to re-login on her ...
5
votes
3answers
365 views

Are CSRF Attacks Really Blind

I'm new to CSRF attacks but don't see how they are always blind. Let's say we are dealing with a site where the asset we need to protect is the HTTP response. Something like one's medical history. ...
9
votes
4answers
534 views

What would happen if one of the popular Linux repositories is hacked?

Even though most people consider downloading your Linux software from you own distribution's repositories as safe, thinking about the scenario where a repository gets hacked sounds thrilling. What ...
1
vote
0answers
3k views

Linux Hydra issue - random correct password success

I have an issue with Hydra when i use it. First let me inform that, i read multible guides, tries the excact same command lines as in guides directly supported by the Damn Vulnerable Web Application ...
9
votes
3answers
791 views

Is it possible to prevent a physical attack on full disk encryption?

I've been researching into some methods to ensure that disk encryption keys can't be stolen, and one that I've come across is called TRESOR. With this kernel patch, you can create a partition that is ...
39
votes
5answers
4k views

New XSS cheatsheet?

There is a great list of XSS vectors avaliable here: http://ha.ckers.org/xss.html, but It hasn't changed much lately (eg. latest FF version mentioned is 2.0). Is there any other list as good as this, ...
0
votes
3answers
682 views

Elaborate Hacking attempt detected - now what?

I am in the process of developing a php/mysql based web application. I took the complicated route and rather than to use a framework or anything I built the entire foundation of my app from scratch. ...
0
votes
2answers
370 views

Help investigating potential website attack (URL rewriting and ROT-13 obfuscation) [closed]

We're looking for help/advice from website security experts. Our company develops web-based process management software and hosts it for our customers. The software sends emails to users when they ...
0
votes
2answers
280 views

DNS Cache Poisoning as a Foil to SSL

I recently learned a bit more about DNS cache poisoning, and my understanding of the basic way it works is by editing the DNS cache so that when the victim types in, say, www.google.com they get the ...
-1
votes
1answer
1k views

Hydra bruteforce is giving wrong passwords. Can't seem to work any help? [closed]

Ok so what im actually trying to do is to bruteforce my own account on some website just to check myself . This is NOT for illegal steps or use , im trying to crack my OWN password , and im trying to ...
2
votes
1answer
694 views

How does Ram Scraper work?

I heard that during Christmas a lot of customer data was stolen using malware attack called Ram Scrapers. What exactly is a Ram Scraper?How would one infect a machine with it?What information can you ...
0
votes
1answer
153 views

Java Drive By & Stub - Explanation [closed]

I have been trying to make some extensions for chrome lately to block some unwanted stuff. I have also been searching for quite some time to find what a JDB does.So , the applet downloads a file , ...
6
votes
1answer
784 views

Using skype for an attack

I am curious about something; let's say someone randomly added me to Skype and tried to initiate a chat with me and I want to know more about them but I am worried if they can do some damage. My ...
22
votes
3answers
3k views

How do DoS/DDoS work?

In the last days one could frequently read about attacks from anonymous and LulzSec against different platforms like Sony or HBGary etc. Yesterday for example they DDoS'ed soca.gov.uk and jhw.gov.cn. ...
1
vote
5answers
275 views

“Safe” public WiFi [duplicate]

Is there any danger of any of my computer's files being read or changed (mainly - infected by malware) in the following scenario (I'm using Windows 7): I have file sharing turned off (in "advanced ...
-4
votes
1answer
289 views

How to prevent malware infection and file accessibility through a wireless router? [duplicate]

The answer suggested in the 'duplicate' is about a different issue. But since my original wording of the question seems to have not been clear - here's a second attempt: Is there any danger of any of ...
1
vote
5answers
240 views

Is it possible for an attacker to change my sent emails content before arrival?

I have a web application that sends "change password link" to user that wants to changhe his password. The link is something like this: http:// ...
1
vote
2answers
364 views

Someone logged on my Centos VM; Can they attack the host OS?

I'm using Windows 7 and decided to learn Linux Administration (Centos 6.4) using Oracle VirtualBox to host the Linux system. In my network configuration I choose "Bridged Adapter". I set the VM's IP ...
-1
votes
2answers
120 views

I don't understand how BIPS got hacked [closed]

http://www.networkworld.com/news/2013/112513-bitcoin-robbery-276352.html In this story we can see BIPS got hacked, but I don't get how it was hacked when it was offline because of the DDoS.
1
vote
2answers
183 views

How secure are the GPG/PGP keyservers?

Importing a GPG key with a KeyID or fingerprint seems to rely on keyservers. Doesn't this invite man-in-the-middle attacks, in which someone would alter the keys to allow them to decrypt the data? ...
1
vote
2answers
197 views

How does the 'QuantumInsert' attack work?

I recently stumbled on descriptions of the 'QuantumInsert' attack (mainly used by the TAO group from NSA). This technique seems to be massively used to perform man-in-the-middle or man-on-the-side ...
2
votes
2answers
389 views

NX bit: does it protect the stack?

I once heard the NX bit was a panacea, then that it was not. One detail I've wondered about though: Does the NX (no execute) bit protect against code inserted into the stack and executed there? It ...
0
votes
1answer
45 views

Photo Attachment's Feature For Some Mail Servers [duplicate]

You already know google started new service which is related to gmail. http://gmailblog.blogspot.com/2013/11/attachments-in-gmail-now-with-power-of.html When we send new mail to friends.If it ...
2
votes
4answers
55k views

Is Teredo in my router a back door?

I use the school computer, which I bought from school, administered by the IT-department. I opened a port to my computer when I stumbled upon this: It points to my computer IP. (I have a static IP ...
62
votes
2answers
11k views

What are rainbow tables and how are they used?

Where can I find one? Is there a pot of gold at the end? How do I protect against them? From the Area51 proposal This question was IT Security Question of the Week. Read the Sep 09, 2011 blog ...
7
votes
2answers
274 views

How stack smashing is prevented?

I just read AlephOne's paper on smashing the stack, and implemented it on my machine (Ubuntu 12.04), it was a bit old so had to take a lot of help from the internet but I enjoyed it. Now, I want to ...
11
votes
8answers
11k views

Is it possible to steal money directly from the systems of a big bank?

Sometimes I imagine: My money in the bank is just a floating point number in a mainframe's memory... So, if I just change 1 bit, I will win a lot of money... The most common way to steal money in ...
4
votes
2answers
252 views

XSS when <, > and " are escaped

I'm pentesting a website that has a reflected XSS, or at least a vector for a reflection, but the issue is the following : It escapes <, >, " to their URL entities (not &, ) or () You are ...
3
votes
3answers
331 views

Is there an attack that can modify ciphertext while still allowing it to be decrypted?

Is there any way an encrypted file using AES-256 could be modified without alerting the file owner, ie., so it can still be decrypted with the same key? I know that without an initialization vector ...
60
votes
4answers
7k views

Can anybody explain XSS? [closed]

I work programming Enterprise Java applications and do very little web development in 2002. I'm interested in security and like to read articles about it. However, I never fully understand how XSS ...
6
votes
1answer
5k views

What is packet drop, packet loss and how Packet drop attack works?

I confused with the three terms: Packet drop. Packet loss. Packet drop attack.
0
votes
1answer
1k views

What methods are there of protecting a VPS from DDOS attacks? [duplicate]

I was just wondering what would be the best way to stop a VPS from being attacked, bandwidth would be a problem in this case so methods that reduce the amount of incoming attacks and stop sending ...
0
votes
3answers
1k views

What is the hack attempt going on when I see: did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

When I look at my sendmail logs, by far the most common "error" I see is the following: Nov 22 16:49:50 MyHostname sendmail[18832]: rAMMnj2u018832: [IP address redacted to hide the guilty] did not ...
6
votes
2answers
6k views

How can someone hack my PC if I am connecting to the internet through NAT?

If I own a private IP address, 192.168.2.1 for the sake of it, and I am physically connected to my router, which it's internal interface is 192.168.2.254 and it's external interface is some public IP ...
9
votes
4answers
2k views

Real life examples of web site attacks

I've been put in charge of educating developers on web application security. One way I will be doing this is through an explanation of various web attacks (e.g., OWASP top ten). In addition to an ...
22
votes
8answers
9k views

Can I detect web app attacks by viewing my Apache log file?

I occasionally get clients requesting I look at their access_log file to determine if any web attacks were successful. What tools are helpful to discern attacks?
1
vote
1answer
227 views

List of social engineering hacks and defenses [closed]

Sorry if this question is absolutely stupid or irrelevant, but I can't help but ask. I am just curious about different approaches hackers take in social engineering attacks, and clever examples of ...
1
vote
3answers
2k views

How to deal with a hacked laptop that's being remotely monitored

One of friends hacked my laptop and now whenever I come online he can tell what tabs are opened in my browser, so I think he is remotely monitoring me. I don't know how he did this, since I didn't ...
5
votes
8answers
2k views

Retrieving OSx Keychain passwords

I have a computer forensics style osx login.keychain file that I am trying to find the passwords from. I have a very weak mac which I used crowbarkc on to try and brute force but the horsepower is ...
1
vote
1answer
502 views

Clear the DNS server's cache?

Is there anyway for the attacker to clear the cache of a DNS server in order to poison it? For example, if someone attacked my DNS server in an attempt to spoof Google.com, they will receive the ...
0
votes
1answer
517 views

What utilities can be used for Ping of death attack?

Can somebody tell me what program can mess with pockets and enlarge them for Ping of death attack? (i need it for lab) Is there anywhere step-by-step instructions of this attack? I'm not a hacker ...
4
votes
3answers
13k views

What are HTTP GET/POST flood attacks?

I want to know what the main differences are between HTTP GET and POST flood attacks and mitigation strategies for both. I searched a lot but I really can't find some good articles nor examples about ...
1
vote
1answer
136 views

I need help figuring out the meaning of a potential hijacking script

I am using Ubuntu 13.04. Something really strange happened. I was writing my homework for a Ruby course. I had Sublime Text 2 (a text editor like Notepad, Notepad++, Textmate etc.) opened and was ...
3
votes
1answer
298 views

What steps need to do to identify security hole

I use VPS hosting. Installed CentOS 6 and ZPanel according to this tutorial http://www.zvps.co.uk/zpanelcp/centos-6 Received warning from hosting provider: This URL has been identified as a phishing ...