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• How can I audit a Linux filesystem for files which have been changed or added within a specific time

  - by Bcos

  We are a website design/hosting company running several sites on a Linux server using Joomla 1.5.14 and recently someone was able exploit a vulnerability in the RW Cards component to write arbitrary files/modify existing files on our filesystem enabling them to do some nasty things to our customers sites. We have removed vulnerable modules from all sites but are still seeing some problems. We suspect that they still have some scripts installed and need a way to audit anything that has been changed or added in the last 10 days. Is there a command or script we can run to do this?

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• What is a good solution for an adaptive iptables daemon?

  - by Matt

  I am running a series of web servers and already have a pretty good set of firewall rules set up, however I'm looking for something to monitor the traffic and add rules as needed. I have denyhosts monitoring for bad SSH logins, and that's great - but I'd love something I could apply to the whole machine that would help prevent bute force attacks against my web applications as well, and add rules to block IPs that display evidence of common attacks. I've seen APF, but it looks as though it hasn't been updated in several years. Is it still in use and would it be good for this? Also, what other solutions are out there that would manipulate iptables to behave in some adaptive fashion? I'm running Ubuntu Linux, if that helps.

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• CentOS: How to prevent a user from executing an application installed in a specific directory

  - by slayernoah

  I have an application installed in /etc/mydir. I have executed the following to remove the ability for users to execute this program. chown root:group1 /etc/mydir -R chmod 700 /etc/mydir -R I created a new user and logged in as this user. The new user was not added to group1 However, I was able to execute this program by just typing the program name. How can I stop users being able to run this using chmod and chown. Please let me know. PS. the new users cannot cd into /etc/mydir but they can still execute using the program name.

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• Is RC4 128bit strong enough? [closed]

  - by al nik

  I notice that services like Gmail use RC4 128 bit as encryption. What is RC4 encryption? Is 128-bit RC4 strong enough by today's encryption standards?

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• How to deny deleting folders in share

  - by alexandr

  Sometimes, users move folders from share. They're need "write" access to write file to share. How to prevent folder lossing?

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• Router reporting failed admin login attempts from home server

  - by jeffora

  I recently noticed in the logs of my home router that it relatively regularly lists the following entry: [admin login failure] from source 192.168.0.160, Monday, June 20,2011 18:13:25 192.168.0.160 is the internal address of my home server, running Windows Home Server 2011. Is there anyway I can find out what specifically is trying to login to the router? Or is there some explanation for this behaviour? (not sure if this belongs here or on superuser...)

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• Windows: View "all" permissions of a specific user or group

  - by peterchen

  For a Windows domain, is there a way to see for a certain user or group, where the user/group has permissions? Primarily: List which files / folders the user can access on a certain network share. (Kind of a recursive "effective permissions") However, other permissions would be cool as well. I believe I've seen such a tool in action, but I can't remember anything beyond that - so this might be a false memory. Recommendations?

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• Chrome - Why am I automatically authenticated to a web app even after clearing browser cookies?

  - by Howiecamp

  I am accessing a web application using Chrome. If I sign out of the app and clear all Chrome history/cookies/etc (even Flash cookies which are now handled by Chrome in the same Clear History area) and then re-access the site, I am automatically logged in without being prompted for credentials. I then launched Chrome in Incognito mode and was able to reproduce the same behavior. However, the I was prompted upon the first logon while in Incognito mode. The web application behaves as expected in Internet Explorer 10. Some info about the application: It's a Sharepoint site using NTLM authentication The credentials are Active Directory-based, as the username is domain\username My connection is over the Internet and there is no AD relationship between my local Windows account, my Windows PC. In other words I (meaning my locally logged on user and my PC) are not in any way part of their AD domain. The site is running SSL on port 443 Why might Chrome be automatically authenticating me?

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• Rookie file permissions question

  - by Camran

  What is the ending 'r' for and the leading 'd' for in file permissions on Linux? Example: drwxr-xr-x I know about the user, group, others part, and I know w=write, r=read, x=execute. But I don't know about the leading 'd' and the trailing 'r'. Care to explain? Thanks

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• .htaccess redirection resulting alias plus directory name

  - by austin cheney

  I am using .htaccess file to redirect all web traffic in a folder to ssl, because the directory prompts users for a login. When a user logs in they are redirected from https://subdir.mailmarkup.org/ to https://subdir.mailmarkup.org/~homedir/subdir. I want users to be redirected from http to https, and this is occuring successfully, however, I do not want users redirected from the first path mentioned above to the second. How do I prevent this?

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• Could it be that "chkrootkit" just doesn't like .hmac, .packlist, and .relocation-tag files?

  - by Danijel

  I just cleaned up my hacked CentOS server (due to not updating since versino 5.3). But still, "chkrootkit" says this: Possible t0rn v8 \(or variation\) rootkit installed /usr/lib/.libfipscheck.so.1.1.0.hmac /usr/lib/.libgcrypt.so.11.hmac /usr/lib/.libfipscheck.so.1.hmac /lib/.libcrypto.so.0.9.8e.hmac /lib/.libssl.so.0.9.8e.hmac /lib/.libssl.so.6.hmac /lib/.libcrypto.so.6.hmac /usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi/auto/Text/Iconv/.packlist /usr/lib/perl5/5.8.8/i386-linux-thread-multi/.packlist /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi/auto/HTML-Tree/.packlist /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi/auto/Font/AFM/.packlist /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi/auto/MLDBM/Sync/.packlist /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi/auto/MLDBM/.packlist /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi/auto/FreezeThaw/.packlist /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi/auto/Apache/ASP/.packlist /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi/auto/HTML-Format/.packlist /usr/lib/gtk-2.0/immodules/.relocation-tag /usr/lib/python2.4/plat-linux2/.relocation-tag /usr/lib/python2.4/distutils/.relocation-tag /usr/lib/python2.4/config/.relocation-tag Could it be that "chkrootkit" just doesn't like .hmac, .packlist, and .relocation-tag files? Are these realy still infected?

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• How would you change a home wireless router with a self-signed admin site certificate to be more secure?

  - by jldugger

  littleblackbox is publishing "private keys" that are accessible on publicly available firmwares. Debian calls these "snake-oil" certs. Most of these routers are securing their HTTPS certs with these, and as I think about it, I've never seen one of these internal admin websites with certs that wasn't self signed. Given a webserver on IP 192.168.1.1, how do you secure it to the point that Firefox doesn't offer warnings (and is still secured)?

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• central log-server with auditdisp

  - by johan

  I want to setup a central log-server. The log-server is running with debian 6.0.6 and the audit daemon is installed in version 1.7.13-1. The Clients are running with Red Hat 5.5 and they connect to the log-server via audispd. The connection works fine and i get all messages from each node. My questions is: is it possible that the auditd daemon from the log server write the messages from each node in a separate file? I try to transfer the messages via the syslog daemon, that works but i can not use tools like ausearch to analyze these log-files.

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• Is it possible to have an external server within a company's firewall?

  - by Jonathan

  Hi guys, I am sure this is server admin 101, but I am unsure of the answer and would love some help. I am a software developer I have built an application for a client and am currently hosting it successfully on SliceHost. We are now coming out of Beta and the client wants to have the application within their firewall, but they do not want to deal with headache of hosting and maintaining the server. Is there a way I can recommend that we put our server at SliceHost within their Firewall? Is that an easy thing to do? Their specific requirements are: For my application to authenticate against their Active Directory, and Only allow access to the application from within their network If that is not possible, what should I recommend to my client?

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• Manually start screensaver with password protect

  - by gibberish

  Windows 7 I wish to manually lock the computer so I placed a shortcut to scrnsave.exe on the desktop. (I do not want the user to use Ctrl+Alt+Del -- Lock This Computer for various reasons) Problem is that when double-clicked, the screen saver starts but it's not password protected. However, in Personalization -- Screen Saver, that same screen saver is the selected one and it IS configured to display logon screen upon resume. And that works when Windows starts the screen saver. So how can I cause "On resume, display logon screen" behavior by manually starting a screen saver? (Scripting is an option if I know what to do.)

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• Attack from anonymous proxy

  - by mmgn

  We got attacked by some very-bored teenagers registering in our forums and posting very explicit material using anonymous proxy websites, like http://proxify.com/ Is there a way to check the registration IP against a black list database? Has anyone experienced this and had success?

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• what constitutes out-of-band access to a server?

  - by broiyan

  The first time I access my server with a new installation of Filezilla or Putty, I will get prompted that I should continue only if the RSA key shown to me is correct. The cloud provider has advice on their website that I ought to use their AJAX console to get a key out-of-band with which to compare to the one shown by Filezilla. The AJAX console is launched from a link on the cloud provider's website which requires a login. Exactly how is this AJAX console considered to be out-of-band when it obviously is not a form of physical access to the server?

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• OSX - Update "Java for OS X 2012-002" is not mentioned on support.apple.com, is this ok?

  - by snies

  Straight after installing "Java for OS X 2012-001" Software Update asks me to install "Java for OS X 2012-002", which has the exact same size (66.6 MB) and description (including the same two links: HT5055 and HT1222) as the former, which strikes me as odd. The "Java for OS X 2012-001" is described on the apple support pages, but the "Java for OS X 2012-002" is not mentioned anywhere. Also searching on google does not yield any usable results. What is your opinon? Am i paranoid? Did you also see this update?

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• Windows: disable remote access of local drive, even by domain admin

  - by Matt

  We have a network of Windows 7 PCs that are managed as part of a domain. What we want is for the domain admin to be unable to view the PC's local drive (C:) unless he is physically at the PC. In other words, no remote desktop and no ability to use UNC. In other words, the domain admin should not be allowed to put \\user_pc\c$ in Windows Explorer and see all the files on that computer, unless he is physically present at the PC itself. Edit: to clarify some of the questions/comments that have come up. Yes, I am an admin---but a complete Windows novice. And yes, for the sake of this and my similar questions, it is fair to assume that I am working for someone who is paranoid. I understand the arguments about this being a "social problem versus a technical problem", and "you should be able to trust your admins", etc. But this is the situation in which I find myself. I'm basically new to Windows system administration, but am tasked with creating an environment that is secure by the company owner's definition---and this definition is clearly very different from what most people expect. In short, I understand that this is an unusual request. But I'm hoping there is enough expertise in the ServerFault community to point me in the right direction.

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• Running Radius on a Novell Backbone

  - by YsoL8

  Hello I am a rookie network engineer and I've been asked to create a secure wireless system intergrated with an existing network. So far I'd decided to use 802.1x secuity with a Radius enabled server over a Novell backbone. My question is: does Novell still support this type of server setup? I heard rumours it is at the end of it's supported life and I'd like some confirmation. Also can I get some recommendations on better backbone / server providers. Cheers

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• Active Directory Permission Diag Tool

  - by Skit

  I'm trying to identify potential permission issues on areas of our AD tree. What I have in mind is something like SysInternals FileMon to monitor object access in Active Directory in real time. For example: Adding a computer to the domain. Is there anything like that in the wild? Is there a better way?

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• Protect Windows VPN from Unauthorized Users

  - by kobaltz

  I have a VPN connection that I use while away from home to remote into my home network. I would use a zero config solution like Hamachi, but need access from my mobile device. Therefore, I have my Windows Home Server acting as the VPN server and will accept incoming connections. Both the username and password are strong. However, I'm worried about brute force attacks against my network. Is there something else that I should do to protect my network from having unauthorized access attempts to my network? I'm familiar with Linux's FAIL2BAN, but wasn't sure if something similar existing for Windows.

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• Compromised Server nginx-mongrel - rails stack

  - by chief

  It looks like someone is using my server and hosting my application on different URL. When I visit this other URL an exact working copy of my website is present, though the browser objects when I attempt to access an HTTPS page. What has this person done?

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• How to defend agains botnet http requests

  - by Killercode

  I have a server with WHM + CPanel and 5 of my costumer got infected with zbot. This means that the domains they have are constantly receiving requests to certain destinations. I tried to use mod_security but seems that it can't filter every requests... I don't really know why? I still see in the access log the connection comming in and it's consuming a LOT of bandwidth and server load Those accounts have already been clean so all of those requests go to error 404 (the ones catched on mod_security I am dropping the connection). Is there anymore ways to defend against this requests?

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• How to secure an Internet-facing Elastic Search implementation in a shared hosting environment?

  - by casperOne

  (Originally asked on StackOverflow, and recommended that I move it here) I've been going over the documentation for Elastic Search and I'm a big fan and I'd like to use it to handle the search for my ASP.NET MVC app. That introduces a few interesting twists, however. If the ASP.NET MVC application was on a dedicated machine, it would be simple to spool up an instance of Elastic Search and use the TCP Transport to connect locally. However, I'm not on a dedicated machine for the ASP.NET MVC application, nor does it look like I'll move to one anytime soon. That leaves hosting Elastic Search on another machine (in the *NIX world) and I would probably go with shared hosting there. One of the biggest things lacking from Elastic Search, however, is the fact that it doesn't support HTTPS and basic authentication out of the box. If it did, then this question wouldn't exist; I'd simply host it somewhere and make sure to have an incredibly secure password and HTTPS enabled (possibly with a self-signed certificate). But that's not the case. That given, what is a good way to expose Elastic Search over the Internet in a secure way? Note, I'm looking for something that hopefully, will not require writing code to provide shims for the methods that I want (in other words, writing forwarders).

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