Ubuntu Security :: HD Attack Into APT Manager And Folder Permissions

May 24, 2010

I may not be a code worrior, yet I have been a Ubuntu convert from Apple for about 3yrs now. Since 1984-2006 now hackers or viruses. And Until now Ubuntu has been clean, well I have been good with repos, etc.

1. Recently I found "Odd" behavior with my Amarok 1.4 player, ffmpeg, winff.

2. During a Synaptic upgrade there were some "unauthorized changes". I have seen this before due to some of my software, so I ignored it. . .

To my bewilderment, "It" erased Amarok 1.4 player, ffmpeg, winff, all image kernels, claimed domain over my system permissions, and external HD. B4 I shutdown, downloaded LUCID 10.4. . . restarted, then copied over all info possible to minimize a complete delete of my system. Upon restart, indeed all kernel images were gone, Only live CD allowed me access to repartition my HD.

NOW. I have Lucid running, and have been denied access to my external HD and partitioned (internal HD). I used Nautilus to copy over files to my internal laptop HD, yet permissions continue to be an issue. The INFECTED FOLDERS are owned by "User 999-user#999. I must micro manage every folder and file to gain "partial permission". The dialog box stutters and never allows me to go down to "Root"

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Ubuntu Security :: Change Permissions Of Folder's Content?

Feb 22, 2011

Recently I've tried installing Calibre from the Software Centre, but it seemed to be glitching as when I press Update Source, the 'In Progress' icon shows up, but when it finishes nothing changes - the Update Source button is still Should I report this?Anyways, I've installed Calibre from their website to .calibre in Home Folder. However, the folder is 'locked' as it requires root priveleges and I can't drop files there without being the admin. I'd like to reduce 'open as root' files to minimum, so I was wondering if there is a way to change the permissions of all the content in one operation, preferably using GUI, and not the terminal?

In addition I've noticed that other folders in my Home Folder like Pictures/Wallpapers require root privileges. This is really annoying as when I 'experiment' with Ubuntu I use Live CD to make sure I don't screw up the main system. When I do I can't open some files from hard disk because of those root inconsistencies

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Ubuntu Security :: Changing Permissions Of Files To Reflect Their New Folder?

Jan 4, 2011

I have a shared folder set up that allows all users on the computer to have access to all the music on the computer. In the folder with all the music the group 'music' has permission to add and delete files and all users are members of 'music'. This should allow all users to have complete access to these files, however, when I add files to the folder they retain their original permissions and do not take on the permissions of the folder. I could change the permissions of the files to reflect the folder every time I add a cd. But that is annoying. What I am wondering is if there is any way to make files automatically reflect the permissions on the folder they are moved into.

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General :: Change Folder Permissions Without Changing The Permissions Of The Files Within The Folder?

Aug 11, 2010

How do I change folder permissions without changing the permissions of the files within the folder?

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Security :: Folder Permissions To Avoid File Upload By Http User?

Feb 24, 2011

However, configured a website on a dedicated server using WHM/cPanel. The site was uploaded using the master account for the website.

The security issue is public users are able to upload files on to my server via the website. They could even access the root and execute whatever they want on the server.

I have consulted with 2-3 Linux experts. According to them, the PHP user has rights to execute anything on the server or upload & store files in whichever folder they want.

Can I protect my folders to avoid file uploads via the website. The application has security vulnerabilites. However, I want to prevent hackers to enter my site until the vulnerabilities are fixed.

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Ubuntu Security :: MITM Attack - TLS Renegotiation Vulnerability

Sep 28, 2010

Using Opera 10.61 and 10.62, I find that any secure website I access, such as a bank, the lock icon in the address bar is replaced by a question mark. Clicking on it brings up a window, stating that the connection is not secure, that the server does not support TLS Renegotiation. Doing some internet searches for "opera tls renegotiation" brought me to a page at the Opera website, where they discuss this issue. The issue is generic, not limited to Opera, affecting the TLS protocol, and it potentially enables a man-in-the-middle to renegotiate a "secure" connection between a server and client, issuing own commands to the server. Opera has addressed the problem on the client end, but now servers need to be upgraded too. None of the HTTPS sites I have tried have upgraded their servers, if the information provided by the Opera browser is correct.

My questions: how feasible is such a MITM attack, what level of resources would such an attack require? What, if anything, would the attacker need to know about the client and/or server to mount the attack? Would I be better off using Firefox, or is Firefox simply oblivious of the problem and not issuing warnings for that reason?

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Ubuntu Security :: Broke Into Computer - Verify Attack?

Dec 28, 2010

mpg123 suddenly started playing a police siren occationly. I checked the process once I heard it, and root was the process owner. How could this happen? Have someone broke into my computer? If so - how could I verify an attack? I run Ubuntu 9.10.

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Security :: Centos 5.5 Server - How To Protect From Outside Attack

Dec 21, 2010

I have just configured Centos 5.5 LocalMailServer with fetchmail and sendmail , Proxy with Squid and FileServer with samba. Now my concern is security.. How can i protect my server with outside attack. Will I need to block some ports or I need special tools or script so no one from outside can attack my machine. My machine is working on intranet with local ip only.. No web server or static ip exists. Machine is connected with ADSL router to access internet.

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Security :: Track DDoS Attack On A Server?

Jan 25, 2011

how can I track a Dos and DDoS attack on a server . Does linux have any goiod known command line utilities and log files to us e in this way?

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Security :: NSA On Computer Network Attack & Defense

May 3, 2010

Quote:

The 605-page PDF document reads like a listing of the pros and cons for a huge array of defensive and counterintelligence approaches and technologies that an entity might adopt in defending its networks. Of particular interest to me was the section on deception technologies, which discusses the use of honeynet technology to learn more about attackers´┐Ż methods, as well as the potential legal and privacy aspects of using honeynets. Another section delves into the challenges of attributing the true origin(s) of a computer network attack.

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Security :: Sample Attack On Honeypot System?

Nov 23, 2010

I have implemented two machines one for honeypot(192.168.100.10) and another(192.168.100.20) to remotely log the honeypot log file using syslog. Inside honeypot I emulated another 3 machines with services on virtual IPs of that same block.Now honeypot is working and I can see the logs generating as I did a portscan(nmap) on those virtual IPs from .20 machine.All of the machines are running ubuntu.

But does anyone know any s/w or tools which originally attackers use so that I can get a clear picture of what happens from the logs. Having problems creating these attack scenarios.

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Security :: Program To Stop DDOS Attack?

May 30, 2011

i have 1 question no more because i got many ddos attack and my load is 95++ what is the best program to stop DDOS Attack ?

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Ubuntu Security :: Firestarter Howing Attack From Samba Service

Mar 17, 2010

I got alarm on Firestarter showing attack from samba service on port 139 . Is that ok for my host computer ? or a serious attack .

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Fedora Security :: Server Seems To Attack The World Hacking?

Apr 10, 2009

I went away from home for a few days, ... Now I am back at home and noticed, that my server is going out with 100% available bandwidth. The server is mainly Http / Ftp / Mail server, so I stopped all services, to see which one it is. ervices stopped, still 100Mbps go out like ants in the flood.

I updated the system, made a backup, installed IPtraf. It seems that I have something 'installed' and my server is running something to attack User computers. It seems to try to find something on random IP's random ports. I am a little bit confused now. As long as my sites are running, I'm ~OK~ but sooner or later I would like to have my bandwidth back. How could I try to hunt down which service/app/process got hacked?

It seems that the monetary system of our society got now more enemy's than friends. Capitalism seems to reach it's end. But my server is serving also ART! Sooner or later we will need to pay copyright even for our thoughts. I was reading today, that the French president wants to punish file sharing as his wife made 3 albums, and wants to get some money ..

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Fedora Security :: Attack Sneaks Rootkits Into Kernel

May 7, 2009

Attack Sneaks Rootkits Into Linux Kernel Quote: A researcher at Black Hat Europe this week will demonstrate a more stealthy way to hack Linux

Apr 14, 2009 | 04:21 PM
By Kelly Jackson Higgins
DarkReading

Kernel rootkits are tough enough to detect, but a researcher this week has demonstrated an even sneakier method of hacking Linux. The attack attack exploits an oft-forgotten function in Linux versions 2.4 and above in order to quietly insert a rootkit into the operating system kernel as a way to hide malware processes, hijack system calls, and open remote backdoors into the machine, for instance. At Black Hat Europe this week in Amsterdam, Anthony Lineberry, senior software engineer for Flexilis, will demonstrate how to hack the Linux kernel by exploiting the driver interface to physically addressable memory in Linux, called /dev/mem.

"One of bonuses of this [approach] is that most kernel module rootkits make a lot noise when they are inserting [the code]. This one is directly manipulating" the memory, so it's less noticeable, he says. The /dev/mem "device" can be opened like a file, and you can read and write to it like a text file, Lineberry says. It's normally used for debugging the kernel, for instance.

Lineberry has developed a proof-of-concept attack that reads and writes to kernel memory as well as stores code inside the kernel, and he plans to release a framework at Black Hat that lets you use /dev/mem to "implement rootkit-like behaviors," he says. The idea of abusing /dev/mem to hack the Linux kernel is not really new, he says. "People have known what you can do with these /dev/mem devices, but I have never seen any rootkits with dev/mem before," he says.

Quote: "The problem with kernel-based rootkits is that the rootkit can mitigate [detection] because it has control," he says. "It's a race in the kernel to see who's going to see who first." [URL]

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Fedora Security :: Cold Boot Attack Prevention

May 13, 2009

I have full hdd encryption with a rather long key. The thing is the FBI might just show up at my house one day and have a warrant for my PC, and who wants the government looken through there life? I have a few plans on geting my PC shut down before they can get there hands on it. This is all well and good, but if they can sniff my key from the ram It doesn't matter what my key is or weather they find the computer on or off. Anyhow, i was wondering if there was some way I could add a script to the shut-down process that would over-write the ram.

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Fedora Security :: SE Attack Alerts - Root Out The Source?

Oct 20, 2009

I have been receiving attack alerts. And I would like to root out the source of the problem. I'll give you the messages. If you could help me prevent this hacker from even being able to attempt these things please any advice is helpful. There have been memory stack attempts, failed sys_admin conversion attempts, password file write attempts etc.....

[Code]...

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Security :: How Does Mktemp Prevent Denial Of Service Attack

Apr 22, 2010

This is an excerpt from the Linux man page for mktemp command: "mktemp is provided to allow shell scripts to safely use temporary files. Traditionally, many shell scripts take the name of the program with the PID as a suffix and use that as a temporary filename. This kind of naming scheme is predictable and the race condition. It creates is easy for an attacker to win. A safer, though still inferior approach is to make a temporary directory using the same naming scheme. While this does allow one to guarantee that a temporary file will not be subverted, it still allows a simple denial of service attack. For these reasons it is suggested that mktemp be used instead."

- How can a denial-of-service attack be carried out if a directory name is known?
- Why is it important to use mktemp to generate a sufficiently random file/directory name for temporary files?

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Security :: Attack Warning In Logwatch Message: Loopback Relay

Dec 14, 2010

I'm not concerned about this since this traffic is generated from the loopback address, but would like to find out what it is.

[code]...

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Security :: John The Ripper Brute-force Attack And Multi-core Processors?

Feb 19, 2010

In my Open-Suse server I have a script, where makepasswd output(by default it generates similar passwords: cGyTbqpr, tpJ1LA, 33EXdo) is redirected to mkpasswd(which uses DES by default) in order to generate salted hash of this previously generated password. I would like to test the strength of this system. I have a quad core CPU, and if I start John The Ripper like this(I want to use -incremental:all flag):

john -incremental:all passwd

..only one core is utilized at 100%. Is there a possibility to make all four cores to crack this password? Or is this possible only after reprogramming John The Ripper? Or what is the algorithm for generating passwords with with -incremental:all flag? I mean if John generates passwords randomly in brute-force mode, then it's smart to start four different John processes simultaneously because then one of those four will find the password firs

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Security :: Is Server Under DdOS Attack - Not Having Much Load And Only Few Process Runs But Site Opens Very Slow

Aug 5, 2010

I have a server and i think that my server is under Ddos attack. i see that server is not having much load and only few process runs but my site opens very slow. i executed the following command on my ssh:

[Code]....

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Security :: Effectiveness Of A Salt For An "offline" Attack?

May 4, 2010

Context: I happened to read through an old presentation today on OpenBSD's cryptography page called "A Future-Adaptable Password Scheme". In spite of its age, it still seems relevant and useful. One of the topics it discusses is the problem of "offline" attacks, where an attacker is not slowed down by any system (or other external) security. It's attacker vs. the computational cost of guessing passwords in such a scenario.

Specific question: On several unix-like systems (including Linux), the salt helps make building rainbow tables computationally expensive. It's not enough to guess a password and hash it; the proper salt must be provided as well, or the password will not be discovered.

However, the salt (or the hashed salt) seems to be visible in /etc/shadow. For example:

Code:

foouser:$6$U9a6HdUY$U3qFDMen0wDmL0x5WHm2OWhOgzOZ4MCQxV/oY.i5RhfXCQrLifIVkBpWOd1CbCGimVCjmfxZAaud/sXDf1.mv0:14733:0:99999:7::: So in an offline attack, a rainbow table could be built using precisely that salt, correct? (Yes, I realize /etc/shadow is not readable by non-root users, but I am considering an offline attack.) Building the salt (or the hashed salt) into the hashed password seems to defeat the purpose of using a salt altogether.

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Ubuntu Security :: Www-data Security Permissions?

Mar 17, 2010

I'm running Apache2 under uBuntu 9.10. My problem is that I use my own user "wavesailor" to work on my websites. I kept all my sites under /var/www and I set up the security of the directory after following the guidelines.

Code:
sudo chown -R root:root /var/www
sudo chown -R www-data:www-data /var/www/*

[code]...

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Ubuntu Security :: Opt Folder Doesn't Allow To Create Folder

Oct 28, 2010

I'm new to ubuntu and want to install stepmania so i downloaded the binary, i want to put the files in the /opt/ directory, the only problem is i cant create a new folder, i tried dragging a ready-made file into it but it just says "you do not have the permissions to file:///opt/" Im soo sad i wanna play my sM NOW!

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Ubuntu :: Don't Have Permissions To Save To A Folder

Jan 20, 2010

so running latest ubuntu 9.10 karmic koala. I installed from the terminal PHP and can browse to the localhost and everything looks cool.

I try to use gedit or quanta to save a file to /var/www/

Which is where the test index.php is located but I don't have the correct permissions! I am logged in as the same user I installed ubunutu under which should give me all the rights I need.

I need to give myself permission to write into this folder?

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Ubuntu :: Can't Delete A Folder - Permissions ?

Sep 24, 2010

I have a 500GB iomega portable HD. I used Gparted to split the drive into two partitions, a fat32 of roughly 400GB and an EXT4 partition of roughly 100GB.

On my EXT4 partition, there is a folder called lost+found. I can't delete it because I need to be root, yet my account has administrator priviliges (but I CAN rename the folder). I can't create other folders on this partition, nor can I copy-paste and files on there either.

Basically, that partition is unuseable. In the properties of the folder, it says that I am not the owner so I cannot change the permissions. (It is definitely MY hard drive)
All options are greyed out.

How do I give myself permission to use this EXT4 partition?

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Ubuntu :: Allow Write Permissions To The /var/www Folder?

May 31, 2011

There are lots of tutorials and opinions on file permissions and web hosting.
So lets say I wanted to allow write permissions to the /var/www folder.

which would be best practice?

Chown -R user... allow a specific user to have write capabailities.

use gksudo nautilus (unsure what this does)

or open the folder to all parties.

If anyone has any opinions on file permissions in general or web hosting security then feel free to throw them at me.

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Ubuntu :: Cant Change Folder Permissions?

Feb 7, 2011

Im new to these forums heres my story:Windows 7 on my acer extensa 5230e became corrupted so i installed linux Ubuntu 10.04 on a 320 gb external hdd. I have installed Mixxx and am trying to create my own skins for it. But whenever i try and paste the folder into the /usr/share/mixxx/skins folder it says that I dont have permission toam an administrator... or at least thats what it says i have trie chmod a+w it but it says operation denied: Code: chmod: changing permissions of `/usr/share/mixxx/skins'

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Ubuntu Security :: Updated Browsers Using Update Manager Have Lost Security Login Pages For Web Mail?

Mar 3, 2011

i updated both browsers i have and lost my secure log-in pages (no padlocks showing ) concerning different Web mail accounts.Just before i did these updates i checked an unrelated thing on-line regarding my sound card of which i kept a copy of and got this message below :

!!ALSA/HDA dmesg
!!------------------
[ 12.762633] cfg80211: Calling CRDA for country: AM

[code]....

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Ubuntu :: Folder Permissions In A Samba Share?

Mar 22, 2010

i have an old desktop that i have decided to use as a central point for localhost/website files. I have 2 laptops, a ubuntu and vista, and i want them both to be able to see the public_html folder on my desktop, and be able to create/update folders and files.

I have set up the samba sharing and that's working fine, but when i create folders using my laptop, they are not writeable to the desktop or other laptop because my laptop is the creator. Is there a way that I can set it so that whenever folders/files are created from either laptop, they have full permissions?

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