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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1
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2answers
736 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
votes
0answers
55 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
vote
1answer
70 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
votes
1answer
269 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
807 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
102 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
vote
0answers
59 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
votes
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 ...
-3
votes
1answer
48 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
vote
3answers
499 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 ...
4
votes
3answers
135 views

it is possible to make some wifi router out of service without have the connection password?

Lets say i want to make some WiFi router out of service. I can connect to the router and close the WiFi connection or change the password. But in this case i need to have full access to the router. ...
-1
votes
2answers
107 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
vote
0answers
148 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
485 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 ...
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
4k 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
744 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
863 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
60 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
69 views

Oversized XML attack in axis 1.4

How can we prevent oversized XML attack in webservice implemented with Apache Axis 1.4?
3
votes
1answer
458 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
7k 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
97 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
vote
2answers
93 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
votes
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
vote
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
votes
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
97 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. ...
60
votes
8answers
14k views

Should I change the default SSH port on linux servers?

Is there any advantage in changing the SSH port, I've seen people do that, but I can't seem to find the reason why. If you have a strong password and/or a certificate, is it useful for anything? ...
3
votes
1answer
83 views

Unusual potential vulnerability scan results in Apache logs

Recently I've been seeing entries similar to the following in my Apache access logs. I've replaced the IP address and time with Xs: access_log:xx.xx.xx.xx - - [xx/xx/xx:xx:xx:xx -0100] "GET ...
32
votes
3answers
31k views

How to exploit HTTP Methods

Many security scanners like nikto, nessus, nmap, and w3af sometimes show that certain HTTP Methods like HEAD, GET, POST, PUT, DELETE, TRACE, OPTIONS, CONNECT, etc are vulnerable to attack. What do ...
2
votes
2answers
7k views

Break in attempts from secureserver.net

Over the last few weeks I have seen dozens if not hundreds of break-in attempts from ip addresses which map back to secureserver.net. I know these are GoDaddy machines from the who is look up. ...
1
vote
0answers
48 views

How to find which domain in my VPS triggered a DDoS attack with WP xmlrpc

Today, my data center suspended my VPS for DDoS attack reasons. They say one of my clients, that has WordPress website, started a DDOS attack to another websites using xmlrpc. But I don't know which ...
11
votes
2answers
178 views

What is a Poison Dart attack?

From The Forrester Wave™: DDoS Services Providers, Q3 2015 report, (emphasis mine): Attack types defended CGI request, denial of capability, diluted low rate degrading, direct, DNS ...
2
votes
1answer
89 views

Security implications of the contents of /proc/self/environ in LFI attacks

During penetration testing on a website, the tests have found a local file inclusion vulnerability in an old wordpress plugin that was installed. An attacker can exploit the LFI vulnerability to ...
4
votes
1answer
217 views

Antivirus constantly detecting tmp files as threats

Recently my antivirus has been constantly detecting threats and it's always tmp files. I delete maybe 50 of these files each day. A few days ago it detected a trojan. Last week it detected many ...
1
vote
4answers
255 views

How to find public IP, if it replaced by NAT IP?

I designed a network architecture in cloud. I placed first IPS and then firewall (with Nat). I want to know if some attacks gone to internal networks which are not blocked by IPS. But I think these ...
-4
votes
1answer
123 views

I've been hacked what do I do? [closed]

I believe I may have been hacked, However I am not certain of this. I fear they are able to access my computer remotely. I have done several checks with advice from people online and it to some extent ...
8
votes
3answers
22k views

How to prevent my website from getting malware injection attacks?

My website was banned as a malware website by Google. When I checked the code, I found out that some code injected many files on my server. I cleaned everything manually, edited all files on my server ...
8
votes
1answer
132 views

Got a spam mail with an htm attachment, is the script harmful?

Today I got an email with an htm attachment, the mth contains the below code: <html> <head> <script> var url = "" window.location.href= url; ...
1
vote
1answer
97 views

What was the purpose of this attack if one took place?

Background Windows 7 Home Edition HP desktop (no av/no firewall/ remote assistance enabled) two external drives attached/no documents on internal drive connected to fios wifi (wep ...
1
vote
2answers
169 views

Router or Switch can defend against ARP spoofing attack?

I'm learning about ARP spoofing attacks. Can a router or switch defend against ARP attacks?