An attempt to exploit a weakness in a system, either for nefarious or research reasons. Questions with this tag should be about designing, carrying out, or defending against the attack itself, rather than about the underlying weakness.

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1answer
28 views

How can you spoof a TCP connection to a device that uses the same initial sequence number for each run of a TCP handshake?

So supposing the TCP implementation on a device always uses the same initial sequence number how could you as an off path attacker exploit this to spoof a connection to this device? So in order to do ...
1
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1answer
86 views

man in the middle attack over internet

I've performed some man in the middle attacks (arp poisoning) using ettercap, stuffs on kali linux and i know how exactly it is working. but i was wondering if this attack could be even performed ...
2
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1answer
83 views

Response on targeted attacks against an individual

I'm now an aim for a targeted attack. Someone tries to gather information about me and tries to get access to my accounts. Some time before he/they've managed to succeed (got all the info from my ...
1
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0answers
103 views

What is an Origin Error Attack?

Similar to my previous question here, however I thought it was best to ask two separate questions rather than combining them into one. From The Forrester Wave™: DDoS Services Providers, Q3 2015 ...
5
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3answers
5k views

Facebook spam / phishing attempt?

I got this sent by a friend on Facebook and I don't think its a genuine message: ___ shared a link on your Wall. This will leave you speechless) http://www.facebook.com/pages/Osama-Bin-Laden-Killed-...
1
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1answer
194 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 ...
5
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4answers
1k views

Is this an attack and how can I fix it?

I don't know where to start in searching the forum for existing threads that might cover my issues. I recently received a spoof email pretending to be from a client for whom I've just started to do ...
14
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4answers
2k 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 ...
1
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2answers
49 views

Dynamic, Randomized Protocols to Deter Attackers

Imagine a protocol that changed periodically. What if the order of these fields were changed a lot? One point in time the protocol might be { Payload, Checksum, Length, Flags, ID } The next point ...
4
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1answer
108 views

“Hacking” account when someone uses your email?

I have, on multiple occasions, received this email from Twitter: Since I have received it multiple times either this person clearly thinks the email is theirs or it's spelled similarly, something to ...
111
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9answers
132k views

Can webcams be turned on without the indicator light?

I've made a series of penetration tests in my network and one of the things I've tried was to record webcam and microphone. Recording an end-user's microphone seems to be a stealth thing, but what ...
1
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1answer
37 views

a sent message for an unknown number without me sending it

there is a message sent from my iPhone to an international number. but i didn't send it and it doesn't appear in my message history. is this possible? how can it happen?
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2answers
83 views

How is it possible to receive port scans with destination IP 0.0.0.0?

In my Amazon EC2 I installed a snort to prevent the attacks. I observed some logs TCP Port Scan Source IP is ISP and destination IP is 0.0.0.0. I think 0.0.0.0 is used for in a local network (routing, ...
2
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3answers
74 views

Should it considered a risk if an organization's server OS and version information is leaked? [duplicate]

I am assuming that it should be considered a risk because there may be several security issues of various OSes known to hackers. If a hacker gets access into the victim's network, the extra knowledge ...
4
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2answers
64 views

Can an attack that does not change the server state be considered a CSRF attack?

From Wikipedia: A real CSRF vulnerability in uTorrent (CVE-2008-6586) exploited the fact that its web console accessible at localhost:8080 allowed mission-critical actions to be executed as a ...
1
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2answers
758 views

Attacking a server on port 80 while only port 22 is open on the firewall

There is a question bugging me a after reading on network security. Theoretical situation: there is a packet-filtering firewall, which only accepts tcp/ip communication with destination port 22 on a ...
46
votes
7answers
9k views

How are GPUs used in brute force attacks?

I have read that GPUs can be used in brute force attacks? But how can this be done and is there a need for any other hardware devices (hard disks for instance)? Note: I'm more interested in web ...
0
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0answers
56 views

Prevention of sinkhole attacks

I have read about many approaches to launch and detect sinkhole attacks in wireless (sensor) networks. Yet I couldn't find any (good) articles to read about the prevention/avoidance of sinkhole ...
1
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1answer
74 views

How to avoid abuse of web-server endpoint from a rogue client?

I realized that once a user logs into the application and receives an Auth token there is the potential that they could use that token along with a rogue client to exploit an endpoint that they now ...
3
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1answer
274 views

Suspicious .js attachment [closed]

I received an email today with the following attachment, and I was hoping to see if anyone could help me understand what it was: //} Expose support vars for convenience support = Sizzle.support = {}; ...
0
votes
4answers
891 views

Is it possible to perform a MITM attack with a smartphone?

Will be possible to perform a MITM attack using a smartphone? If yes, that is very dangerous. Is it really a danger attack? Shorted : Is possible to perform a useful MITM attack to a victim using a ...
0
votes
1answer
109 views

What type of attack can bring a website down by serving a redirect loop?

My website has been up for a year and all of a sudden is down with a too many redirect message. www.jdmxchange.com (classifieds for modified cars/parts) I tried to use fiddler to see if it was ...
1
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0answers
62 views

Encrypted Malicious Traffic Database

I was working on a little research project to correctly identify the encrypted traffic pattern generated by various tools/applications for example metasploit (or increase the success rate). I have ...
7
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6answers
3k views

What does it actually mean when someone says their website is hacked?

I have seen many people say that their website has been hacked using some vulnerability. I never fully understood what this means. To me the only way to get control of website is get the FTP details....
-3
votes
1answer
49 views

SSH and Port Forwarding - what are the possible attacks and how to avoid them? [closed]

What are possible attacks when using SSH and Local or Remote Port Forwarding? What are the threats? I understand that there are many, but what are they? And also, how could they be avoided?
1
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3answers
571 views

TSource Engine Query DDoS attack

My gaming machine is under DDoS attack and when I used Wireshark I found the following string "TSource Engine Query" in all UDP packets coming from random IP's. I found using Google that some gaming ...
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votes
2answers
123 views

How risky is to to use external DNS servers? [closed]

My infrastructure doesn't have an internal DNS server, so I just forward any DNS request to external DNS servers by iptables rules. I wonder how risk that can be, and how easy is it to spoof DNS or ...
1
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0answers
158 views

Attackers on sc.imp.live.com [closed]

"Deceptive site ahead Attackers on sc.imp.live.com may trick you into doing something dangerous like installing software or revealing your personal information (for example, passwords, phone ...
12
votes
5answers
2k views

Unknown process on my ubuntu machine communicating over multiple ports with UDP proto

I have a Django web application where the web app and the postgresql database are hosted on two separate Ubuntu-based machines. On my Database machine (and not my web application), if I run sudo ...
4
votes
2answers
503 views

If I send 4mbps of data to a friend with 4mbps connection, will I DoS him?

Suppose my friend has a connection of 4mbps. If I just send him 4mpbs of random data with my server, wouldn't it block his connection? Even if the router has firewalls and closed ports, isn't enough ...
69
votes
5answers
15k views

Found suspicious, obfuscated PHP file. Is this a hack attempt on my website? [duplicate]

I just noticed that the top line of my index.php file got changed to what's below. <?php preg_replace("\xf4\x30\41\x1f\x16\351\x42\x45"^"\xd7\30\xf\64\77\312\53\40","\373\x49\145\xa9\372\xc0\x72\...
28
votes
3answers
2k views

Security implications of rooting Android

My Android smart phone has fancy features that I can get only if I root it, e.g., free-wifi tethering or Cisco VPN (with group name/password). However, the procedure to root my phone makes me ...
17
votes
3answers
5k views

Avast performing an attack?

I have a Toshiba notebook, which came with Norton Internet Security. In addition, I have installed Avast. I received a warning from Norton about a OS Attack: GNU Bash CVE-2014-6271 intrusion attempt. ...
0
votes
1answer
749 views

POODLE vulnerability solution : Effect on customer or client side

I am using windows server 2008 R2 and I have lot of customers who use windows XP,7 and 8 with some of them still using IE6. So now I want to disable SSL3 and enable TLS 1.1 as a security measure for ...
0
votes
1answer
43 views

Responding to a coordinated attack against financial transaction systems [closed]

Imagine a coordinated attack by a large and motivated hacking group, that results in a nation-level compromise of the financial systems we take for granted: credit card payments, accounts at the top ...
27
votes
4answers
4k views

How do you deal with massive port scans?

This morning I was looking through firewall logs and saw there were about 500 packets marked as port scan. The scanning range was from 1000-1200 5000-5200. The IP address is 85.25.217.47 which seems ...
82
votes
6answers
11k views

Script Kiddies - how do they find my server IP?

I've set up a site on Digital Ocean without a domain yet, so there is only the IP. Despite telling no-one of its existence or advertising it, I get hundreds of notices from fail2ban that various IP's ...
3
votes
2answers
65 views

Chosen-ciphertext attack — basic question

Disclaimer: I'm a beginner with security. Problem: I am reading Applied Cryptography by Schneier. He writes: Question: How can "automatic decryption" work without the deduced key? Does the ...
17
votes
3answers
871 views

What prevents people getting charged over NFC in crowded places?

I don't have an NFC-enabled device and I couldn't find any information about this in Google. What is it that protects me against an attacker with a portable NFC terminal charging payments by just ...
0
votes
0answers
65 views

Are link-flooding attacks a real threat or only an academic scenario?

I read some papers about link-flooding attacks (i.e. flooding network links) and I wonder if these attacks are really of relevance in the real-world and what makes them so dangerous compared to ...
-1
votes
1answer
72 views

Oversized XML attack in axis 1.4

How can we prevent oversized XML attack in webservice implemented with Apache Axis 1.4?
3
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1answer
459 views

Is my server being used as a proxy or being attacked?

I have an Ubuntu, Apache, Passenger, and Rails 4 project on AWS EC2. I am unfamiliar with the security and server side of my project. Recently, my site was down because of "too many users" so when I ...
3
votes
3answers
8k views

FIN Attack- What is this type of attack really?

I just wanted to know what exactly is the FIN attack. I know about the FIN flag that is used to indicated the closing of a connection via TCP. But what exactly is FIN attack?
3
votes
1answer
113 views

MDK3 deauthentication attack problem: Every station gets disconnected

Having echo >'ed the BSSID of the AP into a file called blacklist, I run the following command to start a deauthentication attack: mdk3 wlan0mon d -w blacklist -c 11 The problem is however, ...
0
votes
0answers
41 views

chrome red lock icon this page includes other resources which are not secure these resources can be viewd by others while in transit [duplicate]

In the accounts section showing my credit card details in chrome I click on the shield and click load unsafe scripts. The https is then crossed out in red. When i click on that I get this message. ...
1
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2answers
97 views

is the evil twin attack considered sniffing?

Is the evil twin attack included in the sniffing category ? I am really confused and i can't tell if it is.
3
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1answer
41 views

Reason behind HeapSpray format

I am curious as to why heap spraying consists of allocating repeated chunks of NOP + Shellcode? Why is the format not repeating NOP and then just Shellcode at the end; when the stack pivot occurs ...
1
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3answers
9k views

What is a salami attack?

Can someone give a clear definition of a Salami Attack? In the book Security in Computing (4th Edition) by Charles P. Pfleeger. It is stated as a attack to data integrity and I quote the passage: ...
0
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0answers
30 views

Is there a way for someone to block an email from reaching its recipient?

I don't know if this can be done with people who can email spoof your contacts but I've been noticing that my emails just aren't getting to where it needs to go. In the same vein, I also don't get ...
3
votes
1answer
102 views

How can I mitigate against chosen plaintext attacks for AES ECB?

I am developing on a platform where my only encryption option uses AES ECB. The encryption is used to protect parameters that the user can set, and so it susceptible to a chosen plaintext attack. It'...