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  • Remove identifying information from SSH.

    - by The Rook
    When I do an nmap -sV 127.0.0.1 -p 22 of my system I get the following information: SF-Port22-TCP:V=4.62%I=7%D=11/9%Time=4916402C%P=i686-pc-linux-gnu%r(NULL,2 SF:7,"SSH-2.0-OpenSSH_5.1p1\x20Debian-3ubuntu1\r\n"); How do I go about chaining these two pieces of information? i686-pc-linux-gnu and SSH-2\.0-OpenSSH_5\.1p1\x20Debian-3ubuntu1.

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  • zip password crack possible?

    - by tm1rbrt
    I have a piece of software i have to install on company laptops. The installer needs a serial to work properly, but i don't have it (my manager isn't here so i cant ask him). The installer tells me to ring a phone number which doesnt appear to be connected anymore. I would download win32dasm and ollydbg and have a go at cracking the installer but i dont really have time and i havnt done it in years. There is a zip file on the disc that looks like it contains all the program files but it is passworded. Is it feasible to crack this or will it take ages?

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  • Can a malicious hacker share Linux distributions which trust bad root certificates?

    - by iamrohitbanga
    Suppose a hacker launches a new Linux distro with firefox provided with it. Now a browser contains the certificates of the root certification authorities of PKI. Because firefox is a free browser anyone can package it with fake root certificates. Thus a fake root certificate would contain a the certification authority that is not actually certified. Can this be used to authenticate some websites. How? Many existing linux distros are mirrored by people. They can easily package software containing certificates that can lead to such attacks. Is the above possible? Has such an attack taken place before?

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  • TeamViewer - only allow domain logins

    - by BloodyIron
    I recently started a Systems Admin job where teamviewer is used pretty frequently here. Another admin recently left, and the concern is they still have access to all our systems due to how teamviewer works. I want to migrate the entire environment to domain authentication. The documentation shows that setting up windows auth (domain) is easy, but I want to be sure that it is the only way to be authenticated with a teamviewer session here. I cannot yet find anything which explicitly says this. We have licensing for teamviewer 5 and 6, I think. Right now we have 7 in the environment, but I think most are in a trial version, so I am likely to revert to 5 or 6.

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  • Creating limited user account on Windows 7

    - by serena
    I'm sharing my PC (Win 7 x64 Home Premium) with a friend, and I wanna create a guest user for her. I don't want her to reach my files, Windows settings, program adjustments etc. She should just surf the net, create/edit her own Word, Excel documents, and simple things like these. How can I create this user account and make the necessary arrangements for limitations?

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  • Network tools not working with a 3G connection

    - by gAMBOOKa
    Some of my network tools stopped working after I switched to a 3G connection from a DSL one. Cain and Abel's sniffer, Metasploit, even the NMAP scanner. I'm using Windows 7. The 3G device in question is the Huawei E180. Here's the error I get when running NMAP WARNING: Using raw sockets because ppp2 is not an ethernet device. This probably won't work on Windows. pcap_open_live(ppp2, 100, 0, 2) FAILED. Reported error: Error opening adapter: The system cannot find the device specified. (20). Will wait 5 seconds then retry. pcap_open_live(ppp2, 100, 0, 2) FAILED. Reported error: Error opening adapter: The system cannot find the device specified. (20). Will wait 25 seconds then retry. Call to pcap_open_live(ppp2, 100, 0, 2) failed three times. Reported error: Error opening adapter: The system cannot find the device specified. (20) Metasploit's refused connection to my websites too.

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  • Using the right folder for the right job. Article link, please?

    - by Droogans
    There are specific folders designed for specific tasks. /var/www holds your web sites, /usr/bin contains files to run your applications...yet I still find myself putting nearly all of my work in ~. Is it possible to overuse my home directory? Will it come back to haunt me? Anyone have a good link to an article of best practices for organizing your files so that they are placed in their "correct" place? Is there even such a thing in Linux? I am referring specifically to user-generated content. I do not compile applications from source, I use apt-get for those tasks. This article has a great introduction to what I'm looking for. Table 3-2, "Subdirectories of the root directory" is the sort of thing I'm looking for, but with more details/examples.

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  • How do I securely execute commands as root via a web control panel?

    - by Chris J
    I would like to build a very simple PHP based web based control panel to add and remove users to/from and add and remove sections to/from nginx config files on my linode vps (Ubuntu 8.04 LTS). What is the most secure way of executing commands as root based on input from a web based control panel? I am loathe to run PHP as root (even if behind an IP tables firewall) for the obvious reasons. Suggestions welcome. It must be possible as several commercial (and bloated, for my needs) control panels offer similar functionality. Thanks

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  • Webserver logs: "Morfeus Fucking Scanner"

    - by Patrick
    I've just found these accesses in my web server log files: ::ffff:218.38.136.38 109.72.95.175 - [10/Jan/2011:02:54:12 +0100] "GET /user/soapCaller.bs HTTP/1.1" 404 345 "-" "Morfeus Fucking Scanner" ::ffff:218.38.136.38 109.72.95.174 - [10/Jan/2011:02:54:12 +0100] "GET /user/soapCaller.bs HTTP/1.1" 404 345 "-" "Morfeus Fucking Scanner" Should I start to worry ? Or is it just a normal attempt to hack my server ? thanks

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  • How to disable mod_security2 rule (false positive) for one domain on centos 5

    - by nicholas.alipaz
    Hi I have mod_security enabled on a centos5 server and one of the rules is keeping a user from posting some text on a form. The text is legitimate but it has the words 'create' and an html <table> tag later in it so it is causing a false positive. The error I am receiving is below: [Sun Apr 25 20:36:53 2010] [error] [client 76.171.171.xxx] ModSecurity: Access denied with code 500 (phase 2). Pattern match "((alter|create|drop)[[:space:]]+(column|database|procedure|table)|delete[[:space:]]+from|update.+set.+=)" at ARGS:body. [file "/usr/local/apache/conf/modsec2.user.conf"] [line "352"] [id "300015"] [rev "1"] [msg "Generic SQL injection protection"] [severity "CRITICAL"] [hostname "www.mysite.com"] [uri "/node/181/edit"] [unique_id "@TaVDEWnlusAABQv9@oAAAAD"] and here is /usr/local/apache/conf/modsec2.user.conf (line 352) #Generic SQL sigs SecRule ARGS "((alter|create|drop)[[:space:]]+(column|database|procedure|table)|delete[[:space:]]+from|update.+set.+=)" "id:1,rev:1,severity:2,msg:'Generic SQL injection protection'" The questions I have are: What should I do to "whitelist" or allow this rule to get through? What file do I create and where? How should I alter this rule? Can I set it to only be allowed for the one domain, since it is the only one having the issue on this dedicated server or is there a better way to exclude table tags perhaps? Thanks guys

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  • allowing index access only with .htaccess

    - by YsoL8
    Hello I have this in my .htaccess file, in the site root: Options -Indexes <directory ../.*> Deny from all </directory> <Files .htaccess> order allow,deny deny from all </Files> <Files index.php> Order allow,deny allow from all </Files> What I'm trying to achieve is to block folder and file access to anything that isn't called index.php, regardless of which directory is accessed. I have the folder part working perfectly and the deny from all rule is working as well - but my attempt to allow access to index.php is failing. Basically could someone tell me how to get it working?

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  • allowing index access only with .htaccess

    - by YsoL8
    Hello I have this in my .htaccess file, in the site root: Options -Indexes <directory ../.*> Deny from all </directory> <Files .htaccess> order allow,deny deny from all </Files> <Files index.php> Order allow,deny allow from all </Files> What I'm trying to achieve is to block folder and file access to anything that isn't called index.php, regardless of which directory is accessed. I have the folder part working perfectly and the deny from all rule is working as well - but my attempt to allow access to index.php is failing. Basically could someone tell me how to get it working?

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  • Blocking IP Range in .htaccess Problem

    - by Pedro
    Hi, I'm trying to block the access of one of my webapps using IP Filter in the .htaccess, the problem is that after updating the file with: order allow,deny deny from 58.14.0.0/15 allow from all I get the folowing error: Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. What is wrong? Regards, Pedro

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  • Disable mod_security on Dreamhost, for a single cgi script

    - by Hippyjim
    Hi I've searched around a lot, and tried various tweaks to .htaccess files to try to turn off mod_security for a particular cgi script (uber uploader) but it doesn't seem to have any effect. The most popular one I see rehashed all over the web is: # Turn off mod_security filtering. SecFilterEngine Off # The below probably isn't needed, # but better safe than sorry. SecFilterScanPOST Off Which looks relative simple to me - if "SecFilterEngine" is in some way related to mod_security of course. Shame it has absolutely no effect! Does anyone have a suggested way I can simply disable it for a request to any file in my cgi-bin directory?

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  • Disallow root to su on a user which is not listed in /etc/passwd

    - by marc.riera
    Hello, on linux we autenticate users against AD. The AD users are not listed on /etc/passwd. We are about to deploy a NFS solution to mount some extra space for each group of users. If a user(A) with sudo su privileges goes to root, then he can impersonate user(B) just by su user(B) and going to the NFS. Is there any way to disallow root to su user if the user is not listed on /etc/passwd ? Thanks.

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  • Real benefits of tcp TIME-WAIT and implications in production environment

    - by user64204
    SOME THEORY I've been doing some reading on tcp TIME-WAIT (here and there) and what I read is that it's a value set to 2 x MSL (maximum segment life) which keeps a connection in the "connection table" for a while to guarantee that, "before your allowed to create a connection with the same tuple, all the packets belonging to previous incarnations of that tuple will be dead". Since segments received (apart from SYN under specific circumstances) while a connection is either in TIME-WAIT or no longer existing would be discarded, why not close the connection right away? Q1: Is it because there is less processing involved in dealing with segments from old connections and less processing to create a new connection on the same tuple when in TIME-WAIT (i.e. are there performance benefits)? If the above explanation doesn't stand, the only reason I see the TIME-WAIT being useful would be if a client sends a SYN for a connection before it sends remaining segments for an old connection on the same tuple in which case the receiver would re-open the connection but then get bad segments and and would have to terminate it. Q2: Is this analysis correct? Q3: Are there other benefits to using TIME-WAIT? SOME PRACTICE I've been looking at the munin graphs on a production server that I administrate. Here is one: As you can see there are more connections in TIME-WAIT than ESTABLISHED, around twice as many most of the time, on some occasions four times as many. Q4: Does this have an impact on performance? Q5: If so, is it wise/recommended to reduce the TIME-WAIT value (and what to)? Q6: Is this ratio of TIME-WAIT / ESTABLISHED connections normal? Could this be related to malicious connection attempts?

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  • How secure are third party Ubuntu (APT) repository mirrors

    - by bakytn
    Hello! We have locally an Ubuntu mirrors to save a lot of traffic (our external traffic is not free) So whenever I apt-get install "program" it gets from that repository. the question is...basically they can substitute any package with their own? So it's 100% on my own risk and I can be hacked easily on any apt-get upgrade or a-g install or a-g dist-upgrade? for example the very basic ones like "telnet" or any other.

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  • Problem with testsaslauthd and kerberos5 ("saslauthd internal error")

    - by danorton
    The error message “saslauthd internal error” seems like a catch-all for saslauthd, so I’m not sure if it’s a red herring, but here’s the brief description of my problem: This Kerberos command works fine: $ echo getprivs | kadmin -p username -w password Authenticating as principal username with password. kadmin: getprivs current privileges: GET ADD MODIFY DELETE But this SASL test command fails: $ testsaslauthd -u username -p password 0: NO "authentication failed" saslauthd works fine with "-a sasldb", but the above is with "-a kerberos5" This is the most detail I seem to be able to get from saslauthd: saslauthd[]: auth_krb5: krb5_get_init_creds_password: -1765328353 saslauthd[]: do_auth : auth failure: [user=username] [service=imap] [realm=] [mech=kerberos5] [reason=saslauthd internal error] Kerberos seems happy: krb5kdc[](info): AS_REQ (4 etypes {18 17 16 23}) 127.0.0.1: ISSUE: authtime 1298779891, etypes {rep=18 tkt=18 ses=18}, username at REALM for krbtgt/DOMAIN at REALM I’m running Ubuntu 10.04 (lucid) with the latest updates, namely: Kerberos 5 release 1.8.1 saslauthd 2.1.23 Thanks for any clues.

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  • How to protect an OS X Server from an anautorized physical connection?

    - by GJ
    Hi I have an OS X 10.6 server, which I administer via SSH and VNC (via SSH tunnel). I can't leave it at the login window since then VNC connections are refused. Therefore I currently leave it logged with my user account. Since it doesn't have a monitor attached, it doesn't go into screen saver mode, which means it doesn't require a password to retake control. This means it is very easy for anyone connecting a keyboard/mouse and monitor to take control of the system. The screen saver password protection, which I can't get to activate, unlike the system's login window, is perfectly compatible with VNC connections. How could I prevent such direct access to the server without connecting a monitor and without blocking my ability to connect with VNC? Thanks!

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  • Ubuntu Server attack? how to solve?

    - by saky
    Hello, Something (Someone) is sending out UDP packets sent from our whole ip range. This seems to be multicast DNS. Our server host provided this (Our IP Address is masked with XX): Jun 3 11:02:13 webserver kernel: Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=01:00:5e:00:00:fb:00:30:48:94:46:c4:08:00 SRC=193.23X.21X.XX DST=224.0.0.251 LEN=73 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=53 Jun 3 11:02:23 webserver kernel: Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=01:00:5e:00:00:fb:00:30:48:94:46:c4:08:00 SRC=193.23X.21X.XX DST=224.0.0.251 LEN=73 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=53 Jun 3 11:02:32 webserver kernel: Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=01:00:5e:00:00:fb:00:30:48:94:46:c4:08:00 SRC=193.23X.21X.XX DST=224.0.0.251 LEN=73 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=53 Jun 3 11:02:35 webserver kernel: Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=01:00:5e:00:00:fb:00:30:48:94:46:c4:08:00 SRC=193.23X.21X.XX DST=224.0.0.251 LEN=73 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=53 I checked my /var/log/auth.log file and found out that someone from China (Using ip-locator) was trying to get in to the server using ssh. ... Jun 3 11:32:00 server2 sshd[28511]: Failed password for root from 202.100.108.25 port 39047 ssh2 Jun 3 11:32:08 server2 sshd[28514]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.100.108.25 user=root Jun 3 11:32:09 server2 sshd[28514]: Failed password for root from 202.100.108.25 port 39756 ssh2 Jun 3 11:32:16 server2 sshd[28516]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.100.108.25 user=root ... I have blocked that IP address using this command: sudo iptables -A INPUT -s 202.100.108.25 -j DROP However, I have no clue about the UDP multicasting, what is doing this? who is doing it? and how I can stop it? Anyone know?

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  • Disable the user of Internet explorer through policies when called from HTML help

    - by Stephane
    Hello, I have a locked down environment where users are prohibited from doing, well, basically anything but run the specific programs we specify. We just switched a program from using the venerable "WinHELP" help format to HTML help (CHM) but that seem to have an unwanted and rather dangerous side effect: when a user click on a hyperlink inside the HTML help, a new internet explorer window is opened and the user is free to browse and do terrible things to my server (well, not that much, but still...) I have checked the session in this case and the IE window is actually hosted within the help engine: there is no iexplore.exe process running in the user session (and it cannot: it's explicitly prohibited). We have disable all help right now until we find a solution. I'm working with the help team to have all external URLs removed from the help file but that is going to be a long and error-prone task. Meanwhile, I've checked all the group policies option but I have to say that I was unable to find anything that would prevent a standalone IE window hosted in a random process from running. I don't want to disable WinHTTP or the IE rendering engine or anything of the sort. But I need to prevent all users members of a specific AD user group from ever having an IE window displayed to them. The servers are running Windows 2003 and Citrix metaframe 4.5. Thanks in advance

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  • kinit gives me a Kerberos ticket, but no AFS token

    - by Tomas Lycken
    I'm trying to setup access to my university's IT environment from my laptop running Ubuntu 12.04, by (mostly) following the IT-department's guides on AFS and Kerberos. I can get AFS working well enough so that I can navigate to my home folder (located in the nada.kth.se cell of AFS), and I can get Kerberos working well enough to forward tickets and authenticate me when I connect with ssh. However, I don't seem to get any AFS tokens locally, on my machine, so I can't just go to /afs/nada.kth.se/.../folder/file.txt on my machine and edit it. I can't even stand in /afs/nada.kth.se/.../folder and run ls without getting Permission denied errors. Why doesn't kinit -f [email protected] give me an AFS token? What do I need to do to get one?

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