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Finding how a hacked server was hacked

- by sixtyfootersdude

I was just browsing through the site and found this question: My server's been hacked EMERGENCY. Basically the question says: My server has been hacked. What should I do? The best answer is excellent but it raised some questions in my mind. One of the steps suggested is to: Examine the 'attacked' systems to understand how the attacks succeeded in compromising your security. Make every effort to find out where the attacks "came from", so that you understand what problems you have and need to address to make your system safe in the future. I have done no system admin work so I have no idea how I would start doing this. What would be the first step? I know that you could look in the server log files but as an attacker the first thing that I would do would be errasing the log files. How would you "understand" how the attacks succeeded?

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Unable to ping gateway via bridge nic

- by Ara

I'm trying to install KVM on Ubuntu 12.04 server. We have multiple nic on this server of which we primarily use eth0. The server network runs fine(i'm able to ping gateway, ping dns server and ping servers on internet) with eth0 /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.22.194 netmask 255.255.255.0 network 192.168.22.0 broadcast 192.168.22.255 gateway 192.168.22.1 dns-nameservers 10.71.130.58 10.71.130.60 dns-search test.local I installed bridge-utils and configured br0 as below /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet manual auto br0 iface br0 inet static address 192.168.22.194 netmask 255.255.255.0 network 192.168.22.0 broadcast 192.168.22.255 gateway 192.168.22.1 dns-nameservers 10.71.130.58 10.71.130.60 dns-search test.local bridge_ports eth0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off Post which i'm able to ping servers on the same ip range 192.168.22.2-254 except for 192.168.22.1 (which is the gateway) also i'm not able to ping any other servers. I'm not able to ping this machine from network. The output for route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.22.1 0.0.0.0 UG 100 0 0 br0 192.168.22.0 0.0.0.0 255.255.255.0 U 0 0 0 br0 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 I've been struggling with this issue for past 5 days, would be of help if anyone can point me in the right direction to fix this issue. Thanks in advance

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Can't run Ubuntu from disc

- by alex

When I place the boot CD in my CD drive and boot from it, I get the Ubuntu menu. I have these options Try Ubuntu without any change to your computer Install Ubuntu Check disc for defects Test memory Boot from first hard disk I can use the cursor keys to select them, and I can push F1 for help etc. However, I can not select an option. I've highlighted the first and tried enter, space bar etc. I do have a KVM, so I plugged in a 2nd USB keyboard and tried it but no go either. I can push escape and then got to the prompt. Am I doing something wrong?

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Sharing a wifi connection between different user profiles on Windows XP

- by crowne

I've set-up two separate user profiles on an old laptop running Windows-XP, and noted the following strange behaviour. When the wireless network is setup using WEP both user profiles can connect to the internet and I can switch between user profiles, without network connectivity issues. However when I changed the wireless security to WPA2, the first user to connect gets access to the internet, when switching to the second profile the connection fails. The behaviour is the same regardless of which of the two profiles logs on first. I also tried this with one user with admin rights and one without, and got the same result. I'm not too concerned about a fix for this other than forcing the users to log-off when sharing the laptop, but I'd be interested to know if anyone can corroborate my findings. The network config was done using Intel® PROSet/Wireless.

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Are animated GIFs supported in Google Chrome?

- by user30852

I have recently been testing a website and found animated gif images that seem to show fine in IE and Firefox but in Google Chrome they only show briefly and then dissapear! This happens if I view the image on the page or view the file directly. Are there any reported problems in displaying GIFs in Chrome, or is it just being fussy? There seemed to have been some problems in older versions of Chrome, but it's hard to believe something as simple as this wouldn't have been fixed by now. The version of Google Chrome I am using is: 4.1.249.1021 Not sure if this is relevant, but some info about the image: Width: 216 pixels Height: 36 pixels Horizontal resolution: 96dpi Vertical resolution: 96dpi Bit Depth: 32 Frame Count: 3 EDIT: Seems to be a problem relating to the latest beta version of Chrome, as it works fine in 4.0.249

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Open and scroll through 42 GB text file in Mac OS X

- by Django Johnson

I am running Mac OS X 10.8.4 (Mountain Lion) and I am trying to open and scroll through a 42 GB .XML file. I plan on using an XML parser to parse through it and delete parts, but first I need to know how the document is structured so I can know what parts to save. How can I open this text / XML file and scroll through it so I can get a glimpse of its structure? I tried my default text-editor, text-mate, and that couldn't open it. I tried gEdit and that shows the first 10 or so lines, but then quits after trying to load the rest. I would greatly appreciate any and all suggestions!

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Windows 7 Explorer keeps crashing

- by Daniel Liang

I currently have an issue with Windows Explorer. It keeps crashing when I browse through a network drive. This is happening on several computers. I have already obtained a crash dump file but it doesn't state much: Microsoft (R) Windows Debugger Version 6.12.0002.633 X86 Copyright (c) Microsoft Corporation. All rights reserved. Loading Dump File [C:\LocalDumps\explorer.exe.3964.dmp] User Mini Dump File with Full Memory: Only application data is available Symbol search path is: SRV*c:\websymbols*http://msdl.microsoft.com/download/symbols Executable search path is: Windows 7 Version 7601 (Service Pack 1) MP (2 procs) Free x86 compatible Product: WinNt, suite: SingleUserTS Machine Name: Debug session time: Mon Oct 21 11:21:30.000 2013 (UTC - 4:00) System Uptime: 0 days 0:06:20.449 Process Uptime: 0 days 0:05:54.000 ................................................................ ................................................................ .... Loading unloaded module list ............. This dump file has an exception of interest stored in it. The stored exception information can be accessed via .ecxr. (f7c.fe4): Access violation - code c0000005 (first/second chance not available) eax=00000000 ebx=07a3f080 ecx=00000400 edx=00000000 esi=00000002 edi=00000000 eip=76e170f4 esp=07a3f030 ebp=07a3f0cc iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000246 ntdll!KiFastSystemCallRet: 76e170f4 c3 ret I've already tried removing certain context menu items. I disabled all unnecessary start-up items. Ran memtest86 and it looks fine on that end. It also happens when I browse through my local disk. Can anyone take a look into this? Thanks!

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Why is a single thread spread across CPU's?

- by Marcus Lindblom

I'm just curious why the scheduler constantly moves an app between CPUs, rather than keeping it on one. It looks a bit silly to have 4 cores at 25% rather than one at 100%. Does it has to do with heat, or is it more efficient somehow? Do other OS's do it differently? Insights or links to in-depth stuff would be nice. (Couldn't find much myself.) Update: By "spread out" I don't mean that it executes on several cpu's at once, but is being moved from one to the other several times per second, making the effect that it looks spread out.

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How can I get Haproxy to not log local requests?

- by coneybeare

I am trying to clean out some of the log clutter from my machines and am starting by removing requests that are generated from the server themselves. I have cache warmers running around the clock and I don't want these polluting the logs. I was able to get apache to stop logging local requests by adding a dontlog for the local IP: SetEnvIf Remote_Addr "RE\.DA\.CT\.ED" dontlog CustomLog "|logger -p local3.info -t http" combined env=!dontlog and now I am looking for something similar to put in a configuration for the Haproxy log. How can I prevent 127.0.0.1 requests from writing to the Haproxy log? UPDATE: 2/15/11 I use the excellent loggly service to pull out logs in the cloud, but I am seeing tons of logs like this: 2011 Feb 15 06:09:42.000 ip-10-251-194-96 http: RE.DA.CT.ED - - [15/Feb/2011:06:09:42 -0500] "HEAD /search/Nevad/predictive/txt HTTP/1.0" 200 - "-" "Wget/1.10.2 (Red Hat modified)" 2011 Feb 15 06:09:42.000 127.0.0.1 haproxy[10390]: 127.0.0.1:58408 [15/Feb/2011:06:09:42] www i-5dd7a331.0 0/0/0/8/8 200 210 - - --NI 0/0/0 0/0 "HEAD /search/Nevad/predictive/txt HTTP/1.1" and I want them gone. This question focuses on how to remove that haproxy log line from writing to the server side log in the first place.

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Running Emacs on Multiple TTYs in screen

- by Daniel Kessler

When working with EMACS over SSH, is there any way to spawn a new frame of the same emacs session on a different terminal? In my use case, I have screen running, so I have multiple terminals, and can recover which pseudo terminal they're attached to with pts. Suppose I have two "windows" (in GNU screen parlance). The first one is attached to /dev/pts/12 and the second one is attached to /dev/pts/13. I launch emacs on the first window. Is there any way for me to start a new frame of the same session on the second window? I've been playing with passing arguments to make-frame but it seems that the usage that allows me to specify a terminal requires that a terminal object already exists, and I can't see any way to create a new terminal object.

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301 redirect from non www to www issue

- by esmitex

I have been trying to set a 301 redirect from a non www to a www domain since yesterday but it only cause problems on my site. I first tried it from the control panel of the website, then by modifying the .htaccess file with the following: Options +FollowSymlinks RewriteEngine on rewritecond %{http_host} ^mydomain.com [nc] rewriterule ^(.*)$ http://www.mydomain.com/$1 [r=301,nc] My site is based on wordpress, the first problem that occurred was that I could not access my backend anymore… when I was trying to log in the page would just reload itself and then there was an endless loop and the whole site was unaccessible. After removing these few lines, everything was fine.

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Cat5 wiring in my home [closed]

- by Mike

I have problem with cat5 cabling First I ran a length of cable 30 metres to my bedroom 1 and and connected both ends to a wall sockets internally using my punch down tool, both ends look fine. I also ran a cable from bedroom 1 to bedroom 2 so my son can use same internet connection , i then parallel connected my cables in bedroom 1 against using punch down tool using same colours all the way through. I ran a Ethernet cable from modem to first wall socket close to it then at bedroom end used another Ethernet cable to connect pc, it wouldn't connect to pc so I disconnected bedroom 2 cable from bedroom 1 socket. I connected bedroom 1 to pc and it worked, but how do I connect bedroom 2 (obviously cat 5 cable bedroom 1 to 2 is in place) As soon as I connect one wire from bedroom2 I loose Internet connection!

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Find and Replace String in filenames

- by shekhar

I have thousands of files with no specific extensions. What I need to do is to search for a sting in filename and replace with other string and further search for second string and replace with any other string and so on. I.e.: I have multiple strings to replace with other multiple strings. It may be like: "abc" in filename replaced with "def" * String "abc" may be in many files "jkl" in filename replaced with "srt" * String "jkl" may be in many files "pqr" in filename replaced with "xyz" * String "pqr" may be in many files I am currently using excel macro to get the file names in excel and then preserving original names in one column and replacing desired in the content copied in other column. then I create a batch file for the same. Like: rename Path\OriginalName1 NewName1 rename Path\OriginalName2 NewName2 Problem with the above procedure is that it takes a lot of time as the files are many. And As I am using excel 2003 there is limitation on number of rows as well. I need a script in batch like: replacestr abc with def replacestr pqr with xyz in a single directory. Will it be better to do in unix script?

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Graphic driver for Targa Now NT9231

- by Lumio

I thought of installing Xubuntu on my elder Targa Now nettop and didn't think about the driver option. So now I'm here with a fresh Xubuntu installation and looking for graphic drivers. I found someone who might have had a "good" result with SiS - and the package is already installed, but I can't get my xorg.conf right. This is how my xorg.conf looks like right now: Section "Device" Identifier "Configured Video Device" Driver "sis" EndSection Section "Monitor" Identifier "Screen 0" Modeline "1024x768_60.00" 64.11 1024 1080 1184 1344 768 769 772 795 -HSync +Vsync #HorizSync 30.0-62.0 #VertRefresh 50.0-70.0 EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" DefaultDepth 24 SubSection "Display" Depth 24 Modes "1024x768" "800x600" EndSubSection EndSection Thanks for every help given!

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Splunk is fantastically expensive: What are the alternatives?

- by samsmith

This has been discussed, but it has been several months, so it may be time to revisit it: Earlier discussion RE Splunk alternatives For the record, Splunk rocks. But the pricing is simply beyond what we can consider (When I spoke with Splunk today, the cost for a system to index 5gb/day of data is over $30,000.) That is more than we spend on SQL Server (by a large multiple), more than we spend on a rack of servers (by a multiple), etc. etc. The splunk sales team is correct (that for $30K we get more value and functionality than if we spend the same building our own system), but it doesn't matter. The splunk cost is simply too high (by a multiple). Soooooo, we are looking around! Is anyone out there building a splunk like system? Our basic need: Able to listen for syslog messages on multiple udp ports Able to index the incoming data in an async way Some kind of search engine Some kind of UI An API to the search engine (to embed in our console) We currently need to index 3-5gb/day, but need to be able to scale to 10gb/day or more. We do not need a lot of history (30 days is fine). We use Windows 2008 and 2003 servers. Thanks for your thoughts!

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Free, simple, configurable SOCKS5 server

- by Pooria Azimi

I've been looking (for the past 6-7 hours) for a fast, free and configurable SOCKS5 server. I haven't found anything that matches my needs. They are either too complicated, too bare-bones or simply buggy as hell. This is (all) I need: I want it to run on Linux (and also OS X, preferably) I want it to listen on localhost:8888 When my app (say wget.. or curl --socks5=localhost:8888) requests http://www.google.com/search?q=asd (or any other url - both http and https), I want it to fetch the page not from google's servers, but from http://localhost:4444/cached?uri=http://www.google.com/search%3Fq%3Dasd. Nothing more! I don't need caching, or anything else. I just want a SOCKS5 server, running locally, which redirects all queries to my own (local) server. It could be written in C, C++, Python, PHP, Perl, Node.js or any other language. I don't care, as long as it supports my (very limited) needs, or I can easily change the source to make it so. Thanks a lot

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Windows 7, Drivers, Cloning and Sysprep

- by Frank Thornton

I have Windows 7 working on one machine but when I move it off to the new machine it crashes. If this is a driver issue do I need to download the drivers and install them first? Or do I install Windows 7 on the new machine first then copy the drivers folder over to the other disk so it will boot up correctly? EDIT: I was trying this as well: http://www.todo-backup.com/support/tutorial/redeploy-system-to-dissimilar-hardware.htm EDIT: I tried sysprep but on bootup I see the Windows logo then the system crashes. I can stick the drive back in the old hardware and it runs fine.

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Why are unicode characters not rendering correctly

- by sw1nn

Background: I have some unicode characters in my prompt (git status markers essentially) I'm running urxvt under xfce on arch linux. I'm using DejaVu Sans Mono for Powerline font, specified via .Xresources line: URxvt*font: xft:DejaVu Sans Mono for Powerline:pixelsize=14 When I start urxvt the unicode characters do not render correctly. For example ? renders as â However, if I then start a new urxvt from inside the first terminal everything renders correctly. There doesn't appear to be any difference in the environment between the two terminals. What could be the difference between the first invocation and the nested invocation? I suspect the font is not correct in the 'outer' instance, but I'm unsure how to check the font of a running X window screenshot demonstrates the problem: Note: I moved this question from serverfault.com - i hope this site is more appropriate

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mix audio with h264 mp4 video with ffmpeg

- by user2362912

I have 2 files : Input #0, wav, from '105426_1.wav': Duration: 00:00:09.98, bitrate: 1312 kb/s Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 41000 Hz, stereo, s16, 1312 kb/s and: Duration: 00:00:41.29, start: 0.000000, bitrate: 1313 kb/s Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1211 kb/s, 24.42 fps, 25 tbr, 90k tbn, 48 tbc Metadata: handler_name : VideoHandler Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 99 kb/s Metadata: handler_name : SoundHandler I want to insert first audio file into video in special place (for example in 10 secunde of video) and mix it with audio stream of video file. I try to /usr/local/bin/ffmpeg -i 105426_1.wav -i 105426.mp4 -map 0:0 -map 1:1 -map 1:0 video_finale.mp4 but result is : Duration: 00:00:41.31, start: 0.046440, bitrate: 755 kb/s Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s Metadata: handler_name : SoundHandler Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s Metadata: handler_name : SoundHandler Stream #0:2(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 588 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc Metadata: handler_name : VideoHandler I need only one audio stream and first stream play not from beginig but from 10 sec

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Name typing in the "TO" line for last name recognition

- by Buck

I have outlook 2010 on a Windows 7 laptop. When I go to send an email at the "TO" line and I start typing the name, if I start to enter the last name it will not recognize anyone in my contacts and will not auto-populate a list of all the names that fit the description of what I have typed so far. But if I start typing the first name first it will start this auto-choice feature based on what I have typed so far. The company I work for has 20k + employees and If I want to email someone like "Michael Hutch " if I type "Michael" it still gives me like 800 names to chose from. My old laptop that had 2003 Outlook on it, had this functionality. Is there a way to enable this in Outlook 2010?

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IPv6 6to4 on Windows Server

- by Graham Wager

I'm looking for a relatively simple guide to setting up an IPv6 tunnel properly. This network currently has a server (Windows Server 2008R2) running RRAS that establishes connectivity to the internet using a demand-dial PPPoE connection and handles the NAT. It also hosts a DNS server and DHCP. My ISP does not support IPv6, but I have a static IPv4 address. I've read about 6to4 and signed up at tunnelbroker.net, but quickly felt out of my depth. How do I configure my network to use it, and how I should configure my DHCP server with regards to IPv6 addresses?

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Planning to buy a server with at least 48GB Ram, are the blades way to go?

- by varchar1

We're planning to host our website for the first time for ourselves. We have currently have a linode of 8 gigs and the memory is going up to 90% most of the time. So I want to move my website to my own server with huge RAM. So this will be first time to manage any physical hardware of a server. So I came across IBM's BladeCenter, found them interesting. So can I just buy the blade and run it? Or do I have to buy the chassis for sure? Also, do I need to buy an UPS? So how hard is it to setup? How about the hard drives? Can I setup them easily? Please advice.

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How do companies know they've been hacked?

- by Chad

With the news of Google and others getting hacked, I was wondering how companies find out, detect, and/or know they've been hacked in the first place? Sure, if they find a virus/trojan on user's computers or see a very high access rate to parts of their system that don't usually see much, if any, traffic. But, from what I've see in articles, the attack was pretty 'sophisticated', so I wouldn't imagine the hackers would make it so obvious of their hacking in the first place. Maybe someone can enlighten me on current detection schemes/heuristics. Thanks.

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Why do I have two different DNS suffix lists?

- by Rob Kennedy

My Windows XP laptop has two different DNS suffix lists. The first is the one I see by selecting the Properties dialog of any of my network connections, selecting Internet Protocol Properties Advanced DNS tab, and looking at the list under the "Append these DNS suffixes (in order)" option. The second list is the one shown under "DNS Suffix Search List" when I run ipconfig /all. As far as I can tell, only the second list ever gets used to resolve unqualified host names. Why are there two different lists? How do I configure the second list? Or how can I make my computer use the first list?

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Webmin apache on CentOS 6.3 results in 403 forbidden, permissions are OK

- by Mario De Schaepmeester

First of all, I will mention that the permissions are fine for the document root directory, which is /webapps/nimbus/www/public_html The www directory contains a PHP application. PHP is a problem for later if it doesn't work, as I've tested it with a plain html file (does not work either) I just get 403 forbidden responses. The permissions are 755 on webapps and all subdirectories. I've checked other questions here and on the internet, but it was all about those permissions. Whatever info you still need, just ask, I don't know what's relevant as it's the first time ever I'm using webmin or configuring apache.

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