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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0
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3answers
48 views

Necessity of physical access to air-gapped computers

In an intriguing paper Fansmitter: Acoustic Data Exfiltration from (Speakerless) Air-Gapped Computers (also see this summary) the authors demonstrate that they are able to exfiltrate data from an air-...
0
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0answers
19 views

PTK Security without Anonce and Snonce

Is the creation of the PTK still secure if it omits the Anonce and Snonce? My guess is, no, it is not secure anymore, it would be vulnerable for "replay" attacks maybe anyone can explain in a few ...
3
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0answers
53 views

security of libgcrypt when cross-compiling for windows?

Looking at libgcrypt, specifically secmem.c it seems that it does not account for windows-specific memory handling (e.g. VirtualLock) and in fact there is a very troubling comment: #elif defined (...
0
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1answer
48 views

Grabbing ChaCha20 key from ram

There are various other posts which talk about grabbing a key from ram such as http://electronics.stackexchange.com/questions/198274/storing-a-secure-key-in-an-embedded-devices-memory How would you ...
2
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1answer
82 views

How to find out if my MBR has Evil Maid code?

If Truecrypt Bootloader will remain visually the same, how can I find out if it was infected?
0
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1answer
49 views

Following strategy using DDoS mitigation service - UDP bandwith exhaustion attack from spoofed IPs

I need to defend against receiving a massive spam of UDP packets from random spoofed IP addresses. I would make it this way: In my protocol, every UDP packet contains username and password. Firewall(...
4
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0answers
84 views

Attacks on wifi router, don't know what to do or if I should be concerned [closed]

I'm wondering if these attacks are something to worry about, or just my router being a router. [DoS attack: ACK Scan] attack packets in last 20 sec from ip [60.221.xxx.xxx], Friday, May 06,2016 21:12:...
76
votes
1answer
9k views

What is this kind of low-intensity, non-hacking attack on a web service?

I am seeing for about 10 days now a bunch of EC2 machines (about 30, distributed in all regions) which are attacking a server of mine. The interesting (or uninteresting, I do not know yet) fact is ...
3
votes
1answer
98 views

Why POODLE vulnerability has for each byte a probability of 1/256 to get it in plaintext?

I read the Google paper about POODLE vulnerability (https://www.openssl.org/~bodo/ssl-poodle.pdf) and a lot of other articles. Each paper/article wrote about that you have to try it in average 256 ...
0
votes
2answers
81 views

How to deal with UDP bandwidth exhaustion DDoS attacks?

I am building a service, which will use UDP. It will run on Amazon AWS - in the firewall they provide, I can block everything except that one UDP port my service will run. The only thing I'm ...
1
vote
2answers
101 views

XSS vectors in img src and background-image url

I'm a little confused about XSS vulnerabilities when serving img.src and background url. From what I understand, the only way to execute javascript in this case, is to use javascript protocol. Let's ...
30
votes
1answer
3k views

Server attack with \x01

I notice from my server logs that there have been a number of requests like [01/Jun/2016:07:47:58 +0000] "\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\...
1
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0answers
32 views

Simulation vs Formal Analysis of Authentication Protocols

I received a review for my journal paper in which we proposed WOOlim or nspk kind of authentication protocols. We proved the strength of our protocol with rigorous formal methods using CSP and rank ...
0
votes
0answers
46 views

Why isn't ettercap working

I am working on an ARP poisoning/browser redirection project with Ettercap but even if I follow all the steps right it still doesn't work. I tried disabling firewalls too. What I do is: Start ...
0
votes
1answer
101 views

Is Qt framework is under attack or it has something suspicious (only in free version)

I was trying to download Qt framework. I went to its Official site (I'm sure, I checked in Wikipedia) for Visual Studio. But when attempting to download Qt for Windows, my Firefox shows this message: ...
5
votes
1answer
82 views

Is rowhammer comparable to faults caused by radiation?

As far as I know, both rowhammer and radiation based fault injection, can cause arbitrary bit flips in the memory. Are there any differences in matters of possible outcomes of both "attacks" on ...
3
votes
0answers
79 views

Security of the shared secret key for a smart meter (Linky) [closed]

Reading the specs of a new electricity smart meter (called Linky in France), I was surprised about the chosen encryption method (128 bits symmetric key AES), based on a single secret key (called CCC ...
0
votes
2answers
83 views

Repeated “Dos Attack” from remote IPs

I've been having some weird issues with a home network, and it seems to me like I have some vulnerability I don't know about. To be honest, though, I'm not a big network/security guy and I kind of ...
1
vote
1answer
80 views

s this an exploit attempt and where can I analyse it?

Edited: Never mind the MinGW or .bash_history, I can see that is unlikely. Somebody attacking me and those bytes ending up in the frequently used file .bash_history by accident is not that unlikely ...
0
votes
0answers
11 views

stopping router attack script using foreign addresses [duplicate]

I'm not a security expert but I've got someone using a script to attack my router. Sometimes it's every 10 minutes, but since I called the person out, it has increased in frequency. They are blocking ...
1
vote
1answer
35 views

Does this case fit the definition of a replay attack?

I read the definition of a replay attack on Wikipedia. However I don't know if the following case fits the description: An attacker captures a HTTP request sent to a web server, modifies the request ...
25
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3answers
3k views

Does using a live CD make you more vulnerable to remote attacks?

Some people recommend the use of a Linux live CD for online banking, but doesn't that make you more vulnerable to network attacks since it's not updated? I tried installing updates and it required me ...
0
votes
2answers
220 views

What can I do about being heavily port scanned?

I have two devices connected wirelessly to my Linksys router while running Symantec Endpoint Protection on my computer. A few days ago I started using the internet by connecting the cable directly to ...
4
votes
1answer
143 views

How to automate sending messages about abused internet hosts

I have just looked into the error logs of our web server and I have observed a great increase of SQL injection attacks this year. Those attacks, more than 3000 in 2016, usually look like this: ...
1
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1answer
72 views

Attack Challenge/Response Authentication by requesting challenges

If a client/server application uses a challenge/response pattern for authentication, e.g. SCRAM or alike, it often involves the usage of nonces (client nonce and server nonce) for preventing replay ...
63
votes
5answers
9k views

HTTPS web service switched to HTTP. What can go wrong?

I recently visited a website which used to have an HTTPS connection. Now it has just a plain HTTP connection, and the authentication method has changed from user+password to "authenticate with Google ...
2
votes
2answers
61 views

What can a user do in order to protect against CSRF attacks?

If I'm browsing while I'm logged in into my hosting panel or router or any other application, there is a chance of being hacked by a CSRF exploit. So, the question here is about user or client-side ...
11
votes
5answers
3k views

Why do hackers scan for open ports?

So, whenever you hear of the mean little hackers who hack websites you hear of "port scanning". I understand what it is (looking for all open ports / services on a remote machine), however that begs ...
3
votes
3answers
115 views

Is SFTP vulnerable to brute force, bounce, spoof, sniffing and port stealing?

I have been researching FTP and noted that using FTP means you are vulnerable to these types of attacks. I have been looking for an safer alternative and came across SFTP. Is SFTP still vulnerable to ...
1
vote
2answers
39 views

Random autofill [closed]

I was trying to pay for something just now, and when I put my name in the chrome autofill came up and I clicked it. The address that showed up was wrong though but corresponded to the postcode of one ...
1
vote
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 ...
8
votes
3answers
120 views

Can a TCP connection be terminated by an attacker if SSL/TLS has been used to protect data in the TCP segment?

I understand that SSL/TLS is built on top of TCP. That is after a TCP connection is established, an SSL handshake can be started. When it is completed, all communication will be encrypted and ...
-2
votes
1answer
81 views

Clicking a lot of website links in Google Maps, then sent through multiple URL redirects, and lastly to a page that made my laptop start beeping?

I was in Google maps clicking on all the website links listed in the side panel, looking at every website really fast. Note, they were all tattoo parlors. One of the links I clicked bounced me through ...
1
vote
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 ...
1
vote
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
votes
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 ...
1
vote
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?
-1
votes
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
votes
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
votes
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 ...
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 ...
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 ...
1
vote
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 ...
1
vote
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 ...
3
votes
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 = {}; ...
-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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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 ...
2
votes
4answers
160 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
vote
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 ...