Security is not a product, but a process.

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16
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5answers
1k views

What are the “to-do” on protecting Windows server facing the web?

I currently begin to deploy Windows servers facing the web. And I would like to know what are you way of protecting your servers ? What softwares are you using ? On Linux, i'm using Fail2ban to ...
16
votes
6answers
2k views

Is it okay to use a SSH key with an empty passphrase?

When I first learned how to make ssh keys, the tutorials I read all stated that a good passphrase should be chosen. But recently, when setting up a daemon process that needs to ssh to another machine, ...
16
votes
3answers
46k 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 ...
16
votes
8answers
23k views

What security risks are there with employees using Dropbox?

Are there any particular security concerns to keep in mind with company-wide use of Dropbox file sharing / versioning / backing up, and are there specific options or settings that would be recommended ...
16
votes
7answers
4k views

Easiest way to send encrypted email?

To comply with Massachusetts's new personal information protection law, my company needs to (among other things) ensure that anytime personal information is sent via email, it's encrypted. What is the ...
16
votes
5answers
792 views

What's the sneakiest thing you ever had to deal with as a sysadmin?

What's the most devious thing a user has ever done that you've had to deal with? Obviously, we've all seen quite a lot of malice from unfriendly users, but how about from so-called friendly users? In ...
16
votes
7answers
12k views

Monitor an incoming SSH session in real time

Is there any linux software to monitor an incoming ssh session. At a previous job I was told that if you ever needed support from Red Hat for example you could have them SSH into your machine and you ...
16
votes
1answer
569 views

What's the importance of the email address in the DNS SOA lookup?

Is there a real importance in this, except to publish the email address of the person responsible for some DNS zone? In our BIND configuration, we put a mailling list as the responsible for our ...
16
votes
3answers
9k views

How secure is a bluetooth keyboard against password sniffing?

In a situation where an admin will enter sensitive information into a keyboard (the root password), what is the risk that a bluetooth keyboard (ship by default with Mac systems these days) would put ...
15
votes
7answers
1k views

Restrict a Linux user to the files he owns

Imagine a server setup of a shared webhosting company where multiple (~100) customers have shell access to a single server. A lot of web "software" recommends to chmod files 0777. I'm nervous about ...
15
votes
5answers
727 views

What is meant when IT Infrastructure people refer to the “Stack”

Can someone please define what exactly is the "Stack". I know its an industry term but its very vague. I am referring to Infrastructure terminology not "Stack" in terms of memory allocation.
15
votes
3answers
370 views

My site seems to be hijacked… but only when visited from another site… how?

My website is altoonadesign.com if you type it directly in your browser it takes you to the correct site. However if you do a search for "altoona design" and click on the link to my site you get ...
15
votes
5answers
41k 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: ...
15
votes
5answers
11k views

Does fail2ban do Windows?

Can anyone recommend a fail2ban-like tool for a Windows OS? I've got a couple of Windows Media servers that get hammered with brute force authentication attempts. I would like to plug these ...
15
votes
10answers
5k views

How can I increase ssh security? Can I require both a key and password?

I have a small network of servers and I would like to increase the general security. I don't have enough time/money/paranoia to set up a VPN -- what's a basic way I can increase the security of my ...
15
votes
3answers
1k views

How can I implement ansible with per-host passwords, securely?

I would like to use ansible to manage a group of existing servers. I have created an ansible_hosts file, and tested successfully (with the -K option) with commands that only target a single host ...
15
votes
10answers
531 views

Should core system servers be able to connect to the internet for maintenance/support?

A couple of our servers have Oracle maintenance licenses. Our hardware vendor asked there was internet connection in the server room. Our policy is that all machines in that room is isolated from the ...
14
votes
14answers
17k views

Alternatives to RSA SecurID? [closed]

Have you used, and would recommend, an alternative to RSA SecurID for two-factor authentication?
14
votes
2answers
763 views

how do i perform root actions from non-root account?

I want to be able to restart services from a php-script. running under the www-user account. What's the preferred way to perform these actions? I recon I can place create a file with que'd commands, ...
14
votes
5answers
5k views

Can an attacker sniff data in a URL over HTTPS?

Can data included in a URL be considered secure if the connection is made over HTTPS? For example, if a user clicks a link in an email that points to https://mysite.com?mysecretstring=1234 would it ...
14
votes
11answers
4k views

Is there a security benefit to a regular changing password policy?

I've found in several cases, forcing users to change their password on a regular basis becomes more of a strain on maintenance rather than a help for security. Also, I've seen users write their new ...
14
votes
2answers
588 views

How big of a problem is it to punch a hole in the DMZ to one web server?

We currently have our web server in a DMZ. The web server cannot see anything within the internal network, but the internal network can see the web server. How safe would it be to punch a hole in the ...
14
votes
3answers
3k views

How can I set up VLANs in a way that won't put me at risk for VLAN hopping?

We're planning to migrate our production network from a VLAN-less configuration to a tagged VLAN (802.1q) configuration. This diagram summarizes the planned configuration: One significant detail is ...
14
votes
6answers
14k views

Cygwin SSHd Autoblock Failed Logins

I'm running Cygwin with an SSH deamon on a Windows Server 2008 machine. I was looking at the Event Viewer and noticed as much as 5 to 6 failed login attempts per second (brute force) for the last week ...
14
votes
9answers
10k views

Live view of Linux shell commands executed by another user?

Is it possible for the root user in Linux to have a real-time (or close to real-time) view of the shell commands being run by another user logged in via a terminal or SSH? Obviously they're stored in ...
14
votes
2answers
973 views

Are DNS records private information?

Assuming you wanted to create a subdomain that points to a private location (perhaps the location of a database, or the IP address of a computer you don't want people to attempt SSH-ing into), so you ...
14
votes
7answers
4k views

Should we disable the root user?

Should we remove the root password, disable remote login and basically require adminstrators to use sudo to perform administrative actions?
14
votes
6answers
3k views

How difficult is it to setup a mailserver?

I want a secure mail solution, as I am looking to move away from Google and other parties looking into my private data. How much of a PITA is it to setup my own mailserver? Should I go for an ...
14
votes
7answers
4k views

Good low power server/pc for firewall? [closed]

Does anyone know of a low power server/pc that have 2 NIC's, so it can be used for a (OpenBSD) firewall? Sandra
14
votes
8answers
2k views

What are main steps doing forensic analysis of linux box after it was hacked?

What are main steps doing forensic analysis of linux box after it was hacked? Lets say it is a generic linux server mail/web/database/ftp/ssh/samba. And it started sending spam, scanning other ...
14
votes
3answers
26k views

Network Service account accessing a folder share

I have a simple scenario. There's an application on ServerA that runs under the built-in Network Service account. It needs to read and write files on a folder share on ServerB. What permissions do ...
14
votes
5answers
3k views

Updating production Ubuntu boxes the dos and don'ts

Every so often I login to production web/db/tools boxes and see the typical message: 30 packages can be updated. 16 updates are security updates. My question is, how do all of you handle updates on ...
14
votes
3answers
661 views

What should I consider to secure SVN on Windows? [closed]

Currently I am using VisualSVN Server and it's only accessible on my home network. Eventually there will be others accessing it, but for now it's just me and I would like to be able to go down to the ...
14
votes
1answer
8k views

WEP/WPA/WPA2 and wifi sniffing

I know that WEP traffic can be "sniffed" by any user of the WIFI. I know that WPA/WPA2 traffic is encrypted using a different link key for each user, so they can't sniff traffic... unless they ...
13
votes
3answers
1k views

Log every command executed from root

I want to give access to my root server to an external system administrator, but i want to be sure to double check what he is doing to my server, e.g. copying data i don't want them to do and so on. I ...
13
votes
11answers
815 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 ...
13
votes
4answers
1k views

Is iLO safe enough to be hung on the WAN

I am wondering if iLO is safe enough to be hung on the WAN, I looked for some articles but could not find any ? How do you guys secure iLO ? Do you put it behind a firewall ? Would you use a ...
13
votes
11answers
3k views

Chinese Hacker-Bots attempting to exploit our systems 24/7

Our sites our constantly under attack from bots with IP addresses resolving to China, attempting to exploit our systems. While their attacks are proving unsuccessful, they are a constant drain on our ...
13
votes
3answers
724 views

Does my Oracle DBA need root access?

My Oracle DBA Colleague is requesting root access on our production servers. He is arguing that he need it to perform some operations like rebooting the server and some other tasks. I do not not ...
13
votes
5answers
1k views

Which bots and spiders should I block in robots.txt?

In order to: Increase security of my website Reduce bandwidth requirements Prevent email address harvesting
13
votes
2answers
4k views

Possible to change email address in keypair?

I've created an RSA keypair that I used for SSH, and it includes my email address. (At the end of the public key.) I've now changed my email address. Is it possible to change the email address on ...
13
votes
5answers
772 views

Encrypted offsite backups - where to store the encryption key?

In addition to regular onsite backups (kept in a fire resistant safe), we also send tapes offsite once a month, encrypted with AES. So if our site is one day vaporised by an alien heat ray, we should ...
13
votes
6answers
13k views

How do you avoid network conflict with VPN internal networks?

While there's a wide variety of private non-routable networks across 192.168/16 or even 10/8, sometimes in being thoughtful of potential conflict, it still occurs. For example, I set up an ...
13
votes
3answers
2k views

Force authenticated user immediate logoff (emergency case)

In Active Directory if you want to prevent a user from logging in you can either disable their account or simply reset their password. However, if you have a user who is already logged in to a ...
13
votes
1answer
972 views

How to do a post-mortem of a server hack

I have a Windows Server 2003 SP2 machine with IIS6, SQL Server 2005, MySQL 5 and PHP 4.3 installed on it. This is not a production machine, but it is exposed to the world via a domain name. Remote ...
13
votes
2answers
2k views

Auto-booting and Securing a Linux Server with an Encrypted Filesystem

I'm setting up some new Ubuntu servers, and I'd like to secure the data on them against theft. The threat model is attackers desiring the hardware or rather naïve attackers desiring the data. ...
13
votes
2answers
21k 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 ...
13
votes
2answers
1k views

Has anyone got billed for malicious activities (DDoS) on a cloud server?

I would like to know if anyone got billed beyond expectation on a cloud service because of malicious activities (DDoS, etc)? How does EC2 and/or Rackspace Cloud handle these issues? Thank you!
13
votes
4answers
860 views

Reliable software keylogger detection?

I may be dreaming here, But is there a reliable method for keylogger software detection? I'm primarily a developer but I run a couple servers and the thing that worries me most is a software ...
13
votes
6answers
4k views

What are some secure alternatives to FTP? [closed]

This Hacker News story is all about the downsides of FTP. The only reason I might set up FTP is that it's easy. I know about and use scp already, but sometimes I want to share files with someone ...