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  • Deny directory browsing in a Proftpd / Ubuntu Installation

    - by skylarking
    I used this guide to set up a Proftpd installation an Ubuntu 8.04 server... Works well, but the generic user ( userftp ) can run ls and is able to change to any Directory and browse freely on the server ..from the root / and upwards.. I added this line to etc/shells /bin/false in hopes that that would prevent this ... I really only want the userftp account to be able to upload to the generic /home/FTP-Shared directory, and be able to do nothing else on the server. How is this accomplished ... This is a headless Ubuntu box..and I am using CLI only .. no GUI admin tools

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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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  • Restrict Computer or Users from Internet but allow access to intranet and Windows Update / ePO?

    - by MoSiAc
    So this may be impossible but I've been asked to try and find something about it. So far nothing I have found is possible. I need to restrict specific machines or user accounts from regular Internet access but let them have access to the intranet portion of our network. I do not have Active Directory control, nor does anyone at my local workplace (corporate control in a different state). I have tried going through IPsec and doing this per local machine, but that system seems to have been removed from the images that are installed on these machines so that is out. So far the only other option I can think of is assigning the machines a specific ip address and removing their gateway access. This would probably work but the machines need to be able to receive updates that are being pushed to them through ePO and LanDesk. I would really like to do this on the user level because then if I need to do tech work to the machine and need internet access I can get to it but a "special" user could login and not be able to get into anything.

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  • Does the password get sent in the clear when connecting to Sql-Server?

    - by Scott Chamberlain
    I was asked this today and I honestly did not know the answer. If you connect using a connection string without sspi to a server is there any way a 3rd party can intercept on the wire the password used to log in? "Data Source=MyServer;Initial Catalog=MyDatabase;User Id=sa;Password=CanThisBeSniffed;" I am not asking about MiTM attacks just someone listing on the same computer or on the same hub on the network with wireshark or something similar running. I fired up wireshark myself and did not see it in plain text but it could be a simple obfuscation or proper encryption, I just wanted to know which.

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  • Our company claims that the DLP system can even monitor the contents of HTTPS traffic, how is this possible?

    - by Ryan
    There is software installed on all client machines for DLP (Data Loss Prevention) and HIPAA compliance. Supposedly it can read HTTPS data clearly. I always thought that between the browser and the server, this was encrypted entirely. How can software sneak in and grab this data from the browser prior to it is encrypted or after it is decrypted? I am just curious as to how this could be possible. I would think that a browser wouldn't be considered very secure if this was possible.

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  • Why obfuscating a serial number of a device? What is the risk?

    - by Horst Walter
    In one of my xx.stackexchange questions I've got an answer, in which the user has obfuscated his disk's SN (serial number). Recently I have seen this in several photos as well, the SN was blurred out. I' am just curious, because I have never paid attention to this. What could be the potential risk in publishing a device's SN? I do see some sense when it comes to a MAC address, OK, this could be used for tracking. But a SN of a disk, iPad, whatsoever? Maybe there is an important reason for not publishing it, which I haven't seen so far.

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  • New Secure Website with Apache Reverse Proxy

    - by jtnire
    I wish to set up a new website that will be accessed by users using HTTPS. I think it is good practise to put the "real" web server in a seperate subnet, and then install an Apache Reverse Proxy in a DMZ. My question is, where should I put the SSL cert(s)? Should I a) Use a self-signed cert on the "real" web server, and a proper cert on the reverse proxy? b) Use 2 real certs on both the "real" web server and the reverse proxy? c) Don't use any cert on the "real" web server, and use a proper cert on the reverse proxy? I'd like to use a) or c), if possible. I also don't want anyone's browser complaining of a self-signed cert. Thanks

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  • Strange ssh login

    - by Hikaru
    I am running debian server and i have received a strange email warning about ssh login It says, that user mail logged in using ssh from remote address: Environment info: USER=mail SSH_CLIENT=92.46.127.173 40814 22 MAIL=/var/mail/mail HOME=/var/mail SSH_TTY=/dev/pts/7 LOGNAME=mail TERM=xterm PATH=/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games LANG=en_US.UTF-8 SHELL=/bin/sh KRB5CCNAME=FILE:/tmp/krb5cc_8 PWD=/var/mail SSH_CONNECTION=92.46.127.173 40814 my-ip-here 22 I looked in /etc/shadow and find out, that password for is not set mail:*:15316:0:99999:7::: I found this lines for login in auth.log n 3 02:57:09 gw sshd[2090]: pam_winbind(sshd:auth): getting password (0x00000388) Jun 3 02:57:09 gw sshd[2090]: pam_winbind(sshd:auth): pam_get_item returned a password Jun 3 02:57:09 gw sshd[2091]: pam_winbind(sshd:auth): user 'mail' granted access Jun 3 02:57:09 gw sshd[2091]: Accepted password for mail from 92.46.127.173 port 45194 ssh2 Jun 3 02:57:09 gw sshd[2091]: pam_unix(sshd:session): session opened for user mail by (uid=0) Jun 3 02:57:10 gw CRON[2051]: pam_unix(cron:session): session closed for user root and lots of auth failures for this user. There is no lines with COMMAND string for this user. Nothing was found with "rkhunter" and with "ps aux" process inspection, also there is no suspicious connections was found with "netstat" (as I can see) Can anyone tell me how it is possible and what else should be done? Thanks in advance.

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  • SFTP: How to keep data out of the DMZ

    - by ChronoFish
    We are investigating solutions to the following problem: We have external (Internet) users who need access to sensitive information. We could offer it to them via SFTP which would offer a secure transport method. However, we don't want to maintain the data on server as it would then reside in the DMZ. Is there an SFTP server that has "copy on access" such that if the box in the DMZ were to be compromised, no actual data resided on that box? I am envisioning an SFTP Proxy or SFTP passthrough. Does such a product exist currently?

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  • Host's sys admins - can they view files?

    - by FullTrust
    Hi, Just a quick question. When using shared hosting, can system admins (employed by the host) access your files and read your database connectionstring details? Can they also access your database, and view the files, without a connectionstring? I'm assuming there's a certain level of trust, but is this possible/common? Thanks

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

    - by mozillalives
    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, I discovered that the only way (it seems) to have a key that I don't need to auth at every boot is to create a key with an empty passphrase. So my question is, what are the concerns with using a key with no passphrase?

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  • How do anti-viruses work?

    - by Phoshi
    So I was thinking about viruses recently, and wondering how exactly antiviruses keep up? Considering anybody who'd been coding for a few weeks could hack together something do do nasty, nasty things to somebody's PC, the quantity alone would make a simple list of hashes prohibitive, so how do antiviruses do it? Do they monitor process activity and have a 3 strikes rule for doing virus-like things? And if so, what's stopping it from triggering on perfectly harmless things (like me moving files around in \system32)? I did a bit of googling, but the regular places didn't particularly help, and I couldn't find a dupe here, so I thought it'd be good to ask :)

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  • How can I stop SipVicious ('friendly-scanner') from flooding my SIP server?

    - by a1kmm
    I run an SIP server which listens on UDP port 5060, and needs to accept authenticated requests from the public Internet. The problem is that occasionally it gets picked up by people scanning for SIP servers to exploit, who then sit there all day trying to brute force the server. I use credentials that are long enough that this attack will never feasibly work, but it is annoying because it uses up a lot of bandwidth. I have tried setting up fail2ban to read the Asterisk log and ban IPs that do this with iptables, which stops Asterisk from seeing the incoming SIP REGISTER attempts after 10 failed attempts (which happens in well under a second at the rate of attacks I'm seeing). However, SipVicious derived scripts do not immediately stop sending after getting an ICMP Destination Host Unreachable - they keep hammering the connection with packets. The time until they stop is configurable, but unfortunately it seems that the attackers doing these types of brute force attacks generally set the timeout to be very high (attacks continue at a high rate for hours after fail2ban has stopped them from getting any SIP response back once they have seen initial confirmation of an SIP server). Is there a way to make it stop sending packets at my connection?

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  • The Story of secure user-authentication in squid

    - by Isaac
    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> | | A | B Users <---------> [squid-Server] <---> [LDAP-Server] When the Users request access to the Internet, squid ask their name and passport, authenticate them by LDAP and if ldap approved them, then he granted them. Everyone was happy until some sniffers stole passport in path between users and squid [path A]. This disaster happened because squid used Basic-Authentication method. The people of jungle gathered to solve the problem. Some bunnies offered using NTLM of method. Snakes prefered Digest-Authentication while Kerberos recommended by trees. After all, many solution offered by people of jungle and all was confused! The Lion decided to end the situation. He shouted the rules for solutions: Shall the solution be secure! Shall the solution work for most of browsers and softwares (e.g. download softwares) Shall the solution be simple and do not need other huge subsystem (like Samba server) Shall not the method depend on special domain. (e.g. Active Directory) Then, a very resonable-comprehensive-clever solution offered by a monkey, making him the new king of the jungle! can you guess what was the solution? Tip: The path between squid and LDAP is protected by the lion, so the solution have not to secure it. Note: sorry if the story is boring and messy, but most of it is real! =) /~\/~\/~\ /\~/~\/~\/~\/~\ ((/~\/~\/~\/~\/~\)) (/~\/~\/~\/~\/~\/~\/~\) (//// ~ ~ \\\\) (\\\\( (0) (0) )////) (\\\\( __\-/__ )////) (\\\( /-\ )///) (\\\( (""""") )///) (\\\( \^^^/ )///) (\\\( )///) (\/~\/~\/~\/) ** (\/~\/~\/) *####* | | **** /| | | |\ \\ _/ | | | | \_ _________// Thanks! (,,)(,,)_(,,)(,,)--------'

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  • tftpd starts randomly

    - by Mutant
    A few days ago my Little Snitch filter starts popping up tftpd. I'd never seen this before, so I immediately start freaking out thinking my Mac has been compromised. I can't find anything unusual on the system. The process usually dies before I can trace it (little snitch never allowed the connection just left the popup up). I finally caught it once, and found this: [10:32]: sudo lsof -nlP | fgrep tftp Password: tftpd 1924 18446744 cwd DIR 1,3 1326 2 / tftpd 1924 18446744 txt REG 1,3 29856 163979456 /usr/libexec/tftpd tftpd 1924 18446744 txt REG 1,3 600576 163686622 /usr/lib/dyld tftpd 1924 18446744 txt REG 1,3 303300608 189014898 /private/var/db/dyld/dyld_shared_cache_x86_64 tftpd 1924 18446744 0u IPv4 0x34a76100fcbb06e3 0t0 UDP *:55818 tftpd 1924 18446744 2u IPv4 0x34a76100f1113c53 0t0 UDP *:69 [10:32]: ps ax | fgrep 1924 1924 ?? S 0:00.00 /usr/libexec/tftpd -i /private/tftpboot 1949 s000 S+ 0:00.00 fgrep 1924 For the life of me I can't figure out what is starting this. Nothing in cron, launchdaemons, etc. Google searches haven't yielded much either. The connection IP is different each time. So my question is: Has anyone seen anything like this before?

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  • Very Slow DSL (ethernet) speed [New Interesting Update]

    - by Abhijit
    Very IMPORTANT and INTERESTING UPDATE: Due to some reason I just thought to do a complete new setup and this time I decided to again have openSUSE plus ubuntu. So I first reinstall lubuntu and then I installed OpenSUSE 12.2 (64 bit). Now, my DSL speed is working very normal and fine on opensuse. So this is very scary. Is it possible for any operating system to manipulate my NIC so that it will work fine only on that operating system and not on another os? Regarding positive thinking and not being paranoid, what is it that makes ONLY suse to get my NIC to work at normal speed but ubuntu can not do it? Not even fedora? Not even linux mint? What all these OS are lacking that enables suse to work great? == ORIGINAL QUESTION == I 'was' on opensuse 12.2 when my dsl speed was normal. Yesterday I switched from opensuse to ubuntu 12.04 and speed decreased. It came to range of 7-10-13-20-25-kbps. Then I switch to linux mint, and then to fedora. Still slow speed. When I was in ubuntu I disabled ipv6 but still no luck. Now I am in fedora but this time with DIFFERENT ISP. And still I am getting very slow sped. So my guess is this is nothing to do with os. What can be wrong? Is this problem of NIC? Does NIC speed decreases over time? Does NIC life ends over time as with keyboard or mouse? Help please All the os I used are 64 bit and my laptop is Compaq Presario A965Tu Intel Centrino DUal Core. Interesting thing to notice is I get normal speed while downloading torrent inside torrent client softwares. This slow speed issue applied to download from any web browser or installing software using terminal.

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  • How can I start any application with Guest permissions by default?

    - by Tom Wijsman
    Here are my two questions: How can I start any application with Guest permissions by default? How can I set certain applications not to launch with Guest permissions? For the first bullet, any non-Microsoft signed application I launch should run as the Guest account. For the second bullet, I'm imagining adding menu entries like this would be a nice approach: Set to run as Guest (= default selected entry) Set to run as User Set to run as Admin But how do I do this?

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  • Execute build task in Hudson with root privilages

    - by jensendarren
    I have a build script which executes apt-get and therefore requires root privileges. What is the best way to run this script in Hudson? Currently the only solution I have found that works is to add an entry to the sudoers file for the user hudson like so: hudson ALL=(ALL) NOPASSWD:ALL However, although my build script now runs without error in Hudson, I am not entirely comfortable with this solution. Is there a better way?

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  • How to protect custom shapes from being reused? Visio 2010

    - by Chris
    We are building a set of documentation for our business with Visio 2010. We need to make the Visio files accessible to external consultants for review, but we want to ensure that they cannot copy any of our custom shapes or formulas. How can we protect custom shapes/stencils so that they cannot be used outside of our documents? Or, if that's not possible, how can we mark our shapes in such a way that we could prove that they were created by us?

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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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  • Can't connect back to the wireless network after the password was changed

    - by 7777
    Family changed the network password and some other network settings after new computers were brought into the house because apparently they wouldn't work with what we had. Actually an off-site tech remotely changed it, and I have no idea what he did. My laptop detects the network (it shows up under available networks) but whenever I try to connect it says: Windows is unable to connect to the selected network. The network may no longer be in range. Please refresh the list of available networks, and try to connect again. I wish I could give more details, config settings, but frankly I have no idea what I'm looking for. This is XP (also, not a password issue, I know the password, it's just that I have no idea where to enter it, etc.)

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