Security is not a product, but a process.

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12
votes
13answers
3k views

Password expiration policies [closed]

Having just received an email from a supplier informing us that they would be forcing us to change our password every six months, I'm curious to see what password expiration policies people use and ...
9
votes
1answer
12k views

How can I restrict the java plugin to run only on certain sites in Internet Explorer?

I want to secure our centrally managed computers better and it is very difficult to automatically deploy the java runtime, but how to do that is another question. I find the security of Java ...
7
votes
8answers
13k views

How to prevent a LOIC (DDOS) attack? [duplicate]

The program LOIC (in the news a lot the last days) causes a lot of damage. What can I do on my server to prevent this kind of attacks? Auto-block ip when receive a strange connection? Because mostly ...
7
votes
7answers
588 views

Securing WordPress Blog Installation

Besides having secure passwords for my blog user and database connections, what should I do to make sure my WordPress installation is secure on my Linux shared server?
24
votes
4answers
3k views

Are self-signed SSL certificates secure?

I want to have a secure connection, when I log into my webmail, phpMyAdmin, etc. Therefore I signed my own SSL certificates with OpenSSL and told Apache to listen on port 443. Is this in fact ...
20
votes
5answers
1k views

How to secure your CA's private key?

I'm about to implement my own Certification Authority (CA) for interal use only. Now there is a problem, that the CA private should never ever be exploited. So right now the private key is encrypted. ...
14
votes
3answers
43k views

What are the IUSR and IWAM accounts for in IIS?

I'm looking for a good explanation of the IUSR and IWAM accounts used by IIS to help me better configure our hosting environment: Why are they there? What's the difference between them? Do the names ...
11
votes
11answers
1k views

Penetration Testing

We're deploying a new website, hosted ourselves. Short of getting in white hats how would you go about penetration testing from outside the network?
10
votes
6answers
861 views

How to choose a cloud service for backups

I am thinking of using a cloud service to backup one of my client's website. My (clients) main concerns are (in decreasing order of importance) Protection of IP (trade secrets, source code), user ...
9
votes
4answers
3k views

Securing file system for secure SFTP server

This might not seem as a development question, but in essence it is. Let me explain how. Our main development focus is dynamic content pages. Some of our customers have asked us to allow them space ...
8
votes
3answers
494 views

What are some best practices when taking over IT at a new company?

I thought this would make for a good topic with some interesting suggestions. What are the first things you would do when taking over IT at a new organization? What are some red flags you would look ...
2
votes
2answers
336 views

How to find an unauthorized person's entry point to a server

We're running an in house dedicated server with 100's of sites on it. Some of these sites were very insecure and the box was not managed very well. Some one got in, messed up a bunch of stuff and is ...
23
votes
4answers
677 views

Will virtualizing a server mean another OS layer to patch and update, more work and greater risk?

I've done a search and have not found anything addressing issues regarding patching and system updates. I've got guidelines that say servers need to have necessary patches. If I have a VM host then ...
17
votes
9answers
927 views

Steps to take when technical staff leave

How do you handle the departure process when privileged or technical staff resign / get fired? Do you have a checklist of things to do to ensure the continuing operation / security of the company's ...
8
votes
4answers
647 views

Remote Root Login

I know one of the first things you do to secure a server is disallowing remote root login. Passwords are pretty weak; what do people think of only allowing root login via ssh keys or other ...
8
votes
9answers
410 views

What tools do you use for vulnerability scanning?

What are your favorite tools for checking for vulnerabilities in websites?
6
votes
3answers
790 views

SELinux in the Real World

Through my (short) job experience to date, I have gained quite a bit of knowledge of how SELinux works, from an implementation point of view and how to administer it. I personally have several ...
6
votes
13answers
5k views

Relatively easy way to block all traffic from a specific country?

I know this sounds terrible, but I have a web app that has no users in the Philippines, but is constantly bombarded by spammers, carders testing cards, and other BS from there. I can see in the logs ...
5
votes
1answer
604 views

Adding port forwardings programmatically on a ControlMaster SSH session

I just found out about the ControlMaster/ControlPath feature of OpenSSH, which allows you to use a single SSH connection to run multiple terminals. As I often use SSH to use port forwarding to get ...
4
votes
3answers
3k views

How to Open help (.chm) files over unc path

When I try and open a help file (.chm) that resides on a unc path I get the following error: "Navigation to the webpage was canceled". If I copy the file locally I am able to open it. I imagine there ...
18
votes
6answers
1k views

Bad to be logged in as admin all the time?

At the office where I work, three of the other members of the IT staff are logged into their computers all the time with accounts that are members of the domain administrators group. I have serious ...
18
votes
5answers
4k views

Minimum permissions for a user to perform a mysqldump?

I want to start scheduling remote mysqldump crons, and I'd prefer to use a special account for that purposes. I want to grant that user the minimum permissions for getting a full dump, but I'm not ...
14
votes
5answers
38k views

How to remove strict RSA key checking in SSH and what's the problem here?

I have a Linux server that whenever I connect it shows me the message that changed the SSH host key: $ ssh root@host1 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: ...
13
votes
11answers
801 views

Is there a standard method of proving password security to non-mathematicians?

My client has a server that is being subjected to brute-force login attempts from a botnet. Due to the vagaries of the server and the client's client, we can't easily block the attempts through a ...
11
votes
2answers
2k views

The Story of secure user-authentication in squid

once upon a time, there was a beautiful warm virtual-jungle in south america, and a squid server lived there. here is an perceptual image of the network: <the Internet> ...
10
votes
4answers
561 views

Common PHP setup insecurity?

I work with the systems administration at a university and just stumbled across something which is probably common, but was quite a shock to me. All public_html directories and web areas are stored ...
8
votes
1answer
2k views

SSH passphrase remembered in MacOSX Snow Leopard

I am facing a very strange situation with Snow Leopard. I have a Linux server, configured to accept an ssh connection authenticated only through RSA key. No password. On my laptop I correctly deployed ...
5
votes
2answers
2k views

Network authentication + roaming home directory - which technology should I look into using?

I'm looking into software which provides a user with a single identity across multiple computers. That is, a user should have the same permissions on each computer, and the user should have access to ...
5
votes
1answer
9k views

In IIS 7.0, what is the difference between the application pool identity and the web site identity?

In IIS 5.0, by default the identity account of an application pool is ASPNET, and the website, unless impersonation is enabled, run under the account of its application pool's identity. But in IIS ...
1
vote
1answer
989 views

How to monitor file/directory changes

I have a Server running Debian Lenny. Recently I've encountered a few security issues. I am specifically seeing a file get created within /etc/php5/conf.d named 'php-dev.ini'. At first glance the ...
28
votes
6answers
17k views

How to add a security group to a running EC2 Instance?

I have an Amazon EC2 instance running and I will like to add another security group to that instance and then remove the current security group from that instance. Is this possible?
17
votes
3answers
1k views

Securely wipe an entire Linux server with itself

I have remote ssh access and root access. I do not have physical access. I'm not looking for solutions involving booting into anything, I want to do this from what is currently running. OS is SL6. ...
12
votes
13answers
1k views

Is it ethical to hack real systems? [closed]

Is it ethical to hack real systems owned by someone else? Not for profit, but to test your security knowledge and learn something new. I talk only about hacks, which does not make any damage to ...
9
votes
5answers
1k views

Why we need SELinux?

I could not get much idea where the SELinux has been used and what it saves from attacker. I have gone through SELinux web site and read the basic but still not getting clue about SELinux. For the ...
7
votes
2answers
830 views

Real life SELinux security example?

Can anyone give a real life example of where SELinux saved their security bacon? (or AppArmour if you wish). If not your own, a pointer to someone with a credible experience? Not a lab test, not a ...
7
votes
7answers
3k views

Is there anyway to determine who dropped a table?

A table in the production database has 'mysteriously' disappeared. Does anybody know of any way to diagnose what the heck happened to it? And who did it? Edit 1: This is an internal app, with weak ...
7
votes
13answers
2k views

Locking Desktop USB Ports

How do you lock out the USB ports on the desktop PCs so we can prevent usage of USB drives on the desktops. I should clarify that these are Windows XP desktops. We should also assume that like most ...
5
votes
2answers
1k views

iptables | Types of ICMP: which ones are (potentially) harmful?

I read that certain types¹ of ICMP packets can be harmful. Questions: Which ones and why? How should I layout an iptables ruleset to handle each type of ICMP packet? Should I rate-limit any of these ...
5
votes
3answers
448 views

Should I host my entire web application using https?

Actually my only requirement for using SSL encryption is that when a user logs in, the password is transferred encrypted. However after reading a bit about protocol switching, that an HTTPS session ...
5
votes
5answers
6k views

Security: Unable to display current owner

I have a user with local administrative rights on their Windows 7 64-bit box. They extracted a file from a zip file they downloaded with the Zip shell extension to their desktop on a non-encrypted or ...
4
votes
4answers
6k views

What is the best way to harden Windows Server 2008 R2?

I need to harden my windows 2008 r2 server for PCI. What is the best way to do this? The server are behind a CISCO ASA and in the DB servers are in separate vlans. Now i need to know if there are any ...
4
votes
2answers
2k views

/etc/pam.d/login vs. /etc/pam.d/system-auth

I want to enforce password complexity on my RH system (local authentication) and have discovered that I need a pam module line something similar to this: password required pam_cracklib.so dcredit=-1 ...
3
votes
2answers
4k views

What firewall ports need to be open for Active Directory?

I want to run DFS replication between a couple of servers. It's my understanding that the servers need to be part of a domain for this. Being able to give people a username and password that works on ...
3
votes
7answers
8k views

How to disable CD-ROM and USB for normal users in Linux?

How can access to CD-ROM and USB be disabled for normal users in Linux? As a part of security policy we need to disable CD-ROM and USB access for normal users. Only root users should have the access. ...
3
votes
6answers
820 views

How do we secure our source code?

Our source code is our most prized asset. I would like to have it: secured from proliferation by in-house developers but they also need unrestricted access to the code to do their job right. So I'm ...
3
votes
1answer
2k views

Allow traffic from single IP address, block all other addresses

I have a server running Windows Server 2003. I want to only allow traffic from my IP address and block all other traffic from all other addresses. I'd like to know how to correctly configure this IP ...
2
votes
2answers
3k views

Tracking local user accounts for security audit

I would like to compile a list of local users accounts from all servers on the network. This would include domain and non domain W2K3 machines. A script to run net user and pipe the results to a file? ...
2
votes
3answers
687 views

What should I do to secure a freshly installed Windows Server 2008?

A couple of times now my server has become none responsive, after checking the logs I was getting 10 requests a second to access IIS-FTP. After looking into that I noticed that the default settings ...
13
votes
2answers
19k views

Troubleshooting Windows Authentication problems (no challenge) in IIS 7.5?

I know that there are thousands of reports of people having trouble getting Integrated Windows Authentication to work with IIS, but they all seem to lead to web pages that don't apply or solutions ...
10
votes
11answers
4k views

Server room door security

I wanted to know if anybody had any recommendations as to how to keep the server room secure from employees. There is a lock on the door, however, anybody with a building master (maintenance, owners, ...