Hacking/attack experiences...
I'm, for obvious reasons, only going to talk about the attacks I went through and the *legal* ones I did 😅 😜

Let's first get some things clear/funny facts:
I've been doing offensive security since I was 14-15. Defensive since the age of 16-17. I'm getting close to 23 now, for the record.

First system ever hacked (metasploit exploit): Windows XP.
(To be clear, at home through a pentesting environment, all legal)
Easiest system ever hacked: Windows XP yet again.

Time it took me to crack/hack into today's OS's (remote + local exploits, don't remember which ones I used by the way):
Windows: XP - five seconds (damn, those metasploit exploits are powerful)
Windows Vista: Few minutes.
Windows 7: Few minutes.
Windows 10: Few minutes.
OSX (in general): 1 Hour (finding a good exploit took some time, got to root level easily aftewards. No, I do not remember how/what exactly, it's years and years ago)
Linux (Ubuntu): A month approx. Ended up using a Java applet through Firefox when that was still a thing. Literally had to click it manually xD
Linux: (RHEL based systems): Still not exploited, SELinux is powerful, motherfucker.

Keep in mind that I had a great pentesting setup back then 😊. I don't have nor do that anymore since I love defensive security more nowadays and simply don't have the time anymore.

Dealing with attacks and getting hacked.

Keep in mind that I manage around 20 servers (including vps's and dedi's) so I get the usual amount of ssh brute force attacks (thanks for keeping me safe, CSF!) which is about 40-50K every hour. Those ip's automatically get blocked after three failed attempts within 5 minutes. No root login allowed + rsa key login with freaking strong passwords/passphrases.

linu.xxx/much-security.nl - All kinds of attacks, application attacks, brute force, DDoS sometimes but that is also mostly mitigated at provider level, to name a few. So, except for my own tests and a few ddos's on both those domains, nothing really threatening. (as in, nothing seems to have fucked anything up yet)

How did I discover that two of my servers were hacked through brute forcers while no brute force protection was in place yet? installed a barebones ubuntu server onto both. They only come with system-default applications. Tried installing Nginx next day, port 80 was already in use. I always run 'pidof apache2' to make sure it isn't running and thought I'd run that for fun while I knew I didn't install it and it didn't come with the distro. It was actually running. Checked the auth logs and saw succesful root logins - fuck me - reinstalled the servers and installed Fail2Ban. It bans any ip address which had three failed ssh logins within 5 minutes:
Enabled Fail2Ban -> checked iptables (iptables -L) literally two seconds later: 100+ banned ip addresses - holy fuck, no wonder I got hacked!

One other kind/type of attack I get regularly but if it doesn't get much worse, I'll deal with that :)

Dealing with different kinds of attacks:

Web app attacks: extensively testing everything for security vulns before releasing it into the open.
Network attacks: Nginx rate limiting/CSF rate limiting against SYN DDoS attacks for example.
System attacks: Anti brute force software (Fail2Ban or CSF), anti rootkit software, AppArmor or (which I prefer) SELinux which actually catches quite some web app attacks as well and REGULARLY UPDATING THE SERVERS/SOFTWARE.

So yah, hereby :P

Bank forces me to change my password. Figured I'd use Safari's strong password generation. Submit. Password changed.

Go to log in with new password. Password not saved because I had previously told Safari not to save this site's password.

Okay… so the strong password you JUST generated and submitted without showing me is now my banking password but neither of us knows what it is?

Fucking brilliant. I mean at least let me fucking copy it so I can store it in my password manager. The most hilarious thing is the message that appeared on the generated password saying my password would be available from Safari preferences. Yup, nope. Nothing there except a note saying no passwords will be stored for this site.

This is the state of Apple in 2018, folks. Fucking sad.

Finally got a new job, but it's already a horror story not even 2 hours in (making this while on break)

Everyone here is an Intern, IT? Interns, Designers? Interns, HR? Interns.

The Person who I should've worked with got fired yesterday, and now I have to work all of his shit up from 0, Documentation? Fragmental, a few things here and there, but nothing really.

IT security also doesn't exist in the slightest, there is an Excel sheet called "Master_Passwords" and every single password is in Plaintext, written out for everyone to see. (at least they used "strong" passwords)

And the place also looks run down, theres PC's, Laptops, Mics, Cables etc. lying literally everywhere no-one knows what works and what doesn't (since everyone is an intern)

Not to mention the "Server Room" is an absolute mess itself, cables hanging from literally anywhere, powerstrips are ontop of servers, each rack has like 2 or 3 2U Servers, (in a 40u Rack) and there are 10 of them!

Ten Immutable Laws Of Security

Law #1: If a bad guy can persuade you to run his program on your computer, it's not solely your computer anymore.
Law #2: If a bad guy can alter the operating system on your computer, it's not your computer anymore.
Law #3: If a bad guy has unrestricted physical access to your computer, it's not your computer anymore.
Law #4: If you allow a bad guy to run active content in your website, it's not your website any more.
Law #5: Weak passwords trump strong security.
Law #6: A computer is only as secure as the administrator is trustworthy.
Law #7: Encrypted data is only as secure as its decryption key.
Law #8: An out-of-date antimalware scanner is only marginally better than no scanner at all.
Law #9: Absolute anonymity isn't practically achievable, online or offline.
Law #10: Technology is not a panacea.

This is why having strong and secure passwords are important. Your social media team must be ass BWW.

So... did I mention I sometimes hate banks?

But I'll start at the beginning.

In the beginning, the big bang created the universe and evolution created humans, penguins, polar bea... oh well, fuck it, a couple million years fast forward...

Your trusted, local flightless bird walks into a bank to open an account. This, on its own, was a mistake, but opening an online bank account as a minor (which I was before I turned 18, because that was how things worked) was not that easy at the time.

So, yours truly of course signs a contract, binding me to follow the BSI Grundschutz (A basic security standard in Germany, it's not a law, but part of some contracts. It contains basic security advice like "don't run unknown software, install antivirus/firewall, use strong passwords", so it's just a basic prototype for a security policy).

The copy provided with my contract states a minimum password length of 8 (somewhat reasonable if you don't limit yourself to alphanumeric, include the entire UTF 8 standard and so on).

The bank's online banking password length is limited to 5 characters. So... fuck the contract, huh?

Calling support, they claimed that it is a "technical neccessity" (I never state my job when calling a support line. The more skilled people on the other hand notice it sooner or later, the others - why bother telling them) and that it is "stored encrypted". Why they use a nonstandard way of storing and encrypting it and making it that easy to brute-force it... no idea.

However, after three login attempts, the account is blocked, so a brute force attack turns into a DOS attack.

And since the only way to unblock it is to physically appear in a branch, you just would need to hit a couple thousand accounts in a neighbourhood (not a lot if you use bots and know a thing or two about the syntax of IBAN numbers) and fill up all the branches with lots of potential hostages for your planned heist or terrorist attack. Quite useful.

So, after getting nowhere with the support - After suggesting to change my username to something cryptic and insisting that their homegrown, 2FA would prevent attacks. Unless someone would login (which worked without 2FA because the 2FA only is used when moving money), report the card missing, request a new one to a different address and log in with that. Which, you know, is quite likely to happen and be blamed on the customer.

So... I went to cancel my account there - seeing as I could not fulfill my contract as a customer. I've signed to use a minimum password length of 8. I can only use a password length of 5.

Contract void. Sometimes, I love dealing with idiots.

And these people are in charge of billions of money, stock and assets. I think I'll move to... idk, Antarctica?

So I enventually spent 2 years working for that company with a strong b2b market. Everything from the checkouts in their 6 b2c stores to the softwares used by the 30-people sales team was dependant on the main ERP shit home-built with this monstruosity we call Windev here in France. If you don't know it just google and have some laugh : this is a proprieteray FRENCH language. Not french like made by french people, well that too, but mostly french like the fucking language is un fucking french ! Instructions are on french, everything. Hey that's my natural language okay, but for code, really ?

The php website was using the ERP database too, even all the software/hardware of the massive logistic installation they had (like a tiny Amazon depot), and of course the emails of all employees. Everything was just handled by this unique shitty and so sloooooow fucking app. When there was to many clients on the website or even too many salespeople connected to the ERP at the same time, every-fuckin-piece of the company was slowing down, and even worse facing critical bugs. So they installed a monitor in the corner of a desk constantly showing the live report page of Google analytics and they started panic attacks everytime it was counting more than 30 sessions on the website. That was at the time fun and sad to observe.

The whole shit was created 12 years ago and is since maintened locally by one unique old-fashion-microsoft dev who also have to maintain all the hardware of all the fucking 150+ people business. You know, when the keyboard of anyone is "broken" cause it's unplugged... That's his job too. The poor guy was totally overstressed on a daily basis and his tech knowledge just saddly losts themeselves somewhere in the way. He was my n+1 in a tech team of 3 people : him, a young and inexperimented so-called "php developer" who was in charge of the website (btw full of security holes I discovered and dealed with when I first arrive at the job), and myself.

The database was a hell of 100+ tables of business and marketing data with a ton of specific logic added on-the-go during years. No consistent data model or naming. No utf8. Fucked up relations that ends with queries long enough to fill books. And that's not all, all the customers passwords was just stored there uncrypted. Several very big companies and administrations were some of these clients. I was insisting on the passwords point litterally all the time, that was an easy security fix and a good start... But no, in two years of discussions on the subject I never achieved to have them focusing on other considerations than "our customers like that we can remind them their password by a simple phone call if they lost it". What. The. Fuck. WHATTHEFUCK!

Eventually I ran myself out of this nightmare. I had a few bad jobs already, and worked on shitty software already. But that one really blows my mind (and motivation for a time too). Happy it's over.

I set up unRAID on my server this weekend, and only just checked my logs to see if anything weird was happening. Turns out 2 IPs have been trying to brute-force the SSH password all weekend. I quickly installed the DenyHosts plugin and reminded myself to always use a strong password, which luckily I did.

A bit later now, and one of the 2 gave up, the other one keeps trying but of course the connection is refused. Just keep trying buddy :P

***ILLEGAL***
so its IPL(cricket) season in india, there is a OTT service called hotstar (its like netflix of india), the cricket streams exclusively on hotstar..
so a quick google search reveals literally thousands of emails & passwords, found a pastebin containing 500 emails&passwords ...but those are leaked last year most of passwords are changed & many of them enabled 2FA.. after looking through them we can find some passwords are similar to their emails , some contains birth year like 1975,1997 etc, some passwords end with 123 ..so after trying a few different versions of the passwords like
1) password123 -> password@123, password1234
2) passwordyear -> password@year
2) for passwords similar to emails, we can add 123 ,1234, @ etc
created a quick python script for sending login requests

so after like 30-40 mins of work, i have 7 working accounts

*for those who have basic idea of security practices you can skip this part

lessons learnt
1) enable 2FA
2) use strong passwords, if you change your password , new password should be very different from the old one

there are several thousands of leaked plaintext passwords for services like netflix,spotify, hulu etc, are easily available using simple google search,
after looking through & analysing thousands of them you can find many common passwords , common patterns
they may not be as obvious as password ,password123 but they are easily guessable.
mainly this is because these type of entertainment services are used by the average joe, they dont care about strong passwords, 2FA etc

I've been informed that through some level of recognition and certification, today is "Password Day," seemingly in an attempt to encourage people to have strong passwords. I will do my part and say that if you're not using a password manager, you have missed out on years of your life.

Hi everyone,

One question is constantly popping in my head and I keep fighting to figure out how to answer.

So here it is:
Are you for or agains a password manager to store all your passwords?

P.S.
I am using a paid password manager, but keep asking myself is it really worth it, and am I compromising all my passwords if someone is willing to spend some time and hack my vaults. On the other hand the convenience and benefit of having all passwords in one place and also using different strong passwords for each of my accounts protects me from a weak security implementation on any third party service I use, because I am not re-using the same password everywhere.

!rant

Many out there say you should use 2 factor authentication with everything, but personally i feel lile that would just turn your phone into a sigle point of failure.
Phisical security is my primary worry, because loosing your phone or having it stolen yould pretty much lock you out of all your accounts.
Another thing is i don't know as much about android security, and i wouldn't be confortable managing it.

I have 2FA active for some key services, but imho a strong password is usually enough. I think its far more more importat for your overall security to avoid passwords re-use.

What do you think? Do you have 2FA on all the time?

I've been wondering about renting a new VPS to get all my websites sorted out again. I am tired of shared hosting and I am able to manage it as I've been in the past.

With so many great people here, I was trying to put together some of the best practices and resources on how to handle the setup and configuration of a new machine, and I hope this post may help someone while trying to gather the best know-how in the comments. Don't be scared by the lengthy post, please.

The following tips are mainly from @Condor, @Noob, @Linuxxx and some other were gathered in the webz. Thanks for @Linux for recommending me Vultr VPS. I would appreciate further feedback from the community on how to improve this and/or change anything that may seem incorrect or should be done in better way.

1. Clean install CentOS 7 or Ubuntu (I am used to both, do you recommend more? Why?)
2. Install existing updates
3. Disable root login
4. Disable password for ssh
5. RSA key login with strong passwords/passphrases
6. Set correct locale and correct timezone (if different from default)
7. Close all ports
8. Disable and delete unneeded services
9. Install CSF
10. Install knockd (is it worth it at all? Isn't it security through obscurity?)
11. Install Fail2Ban (worth to install side by side with CSF? If not, why?)
12. Install ufw firewall (or keep with CSF/Fail2Ban? Why?)
13. Install rkhunter
14. Install anti-rootkit software (side by side with rkhunter?) (SELinux or AppArmor? Why?)
15. Enable Nginx/CSF rate limiting against SYN attacks
16. For a server to be public, is an IDS / IPS recommended? If so, which and why?
17. Log Injection Attacks in Application Layer - I should keep an eye on them. Is there any tool to help scanning?

If I want to have a server that serves multiple websites, would you add/change anything to the following?
18. Install Docker and manage separate instances with a Dockerfile powered base image with the following? Or should I keep all the servers in one main installation?
19. Install Nginx
20. Install PHP-FPM
21. Install PHP7
22. Install Memcached
23. Install MariaDB
24. Install phpMyAdmin (On specific port? Any recommendations here?)

I am sorry if this is somewhat lengthy, but I hope it may get better and be a good starting guide for a new server setup (eventually become a repo). Feel free to contribute in the comments.