Securing Linux systems and applications; understanding Linux security features.

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2
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3answers
337 views

Encrypting Backups on Linux

I'm working on an automated backup solution to protect my files on my Linux servers. However, I'm not sure about how to securely encrypt the resulting archives. I am using 64bit linux, and I am ...
2
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2answers
737 views

How to protect Linux partition from access from Windows partition?

In a dual-boot environment (windows? and linux mint 15) What would be best best way to prevent access to the linux partition(s) when the system is booted into windows 7? The goal would be to ...
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5answers
1k views

Encrypt-function inside PHP code that you have to publish

If you write a PHP application, where you have to deliver the compiled code to the customer, how could you include a functionality to send encrypted data from that application to others, and include ...
2
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2answers
473 views

Mixing stateless and stateful firewall rules

I have been advised that mixing firewall rules that are both stateful and stateless can lead to trouble when it comes to troubleshooting. Is there any truth in this? Take the following two rule sets ...
5
votes
1answer
629 views

Are Linux vendor-supplied security updates enough for PCI Compliance?

I have several systems that require PCI compliance, all of them are running CentOS 6.4 with all security updates applied daily. However, PCI compliance scanning will often reject detected versions of ...
3
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3answers
283 views

Best security practices for software development and release?

I am trying to figure out a way to limit access and also to establish processes to avoid any and all of my team members to compromise our entire production system. We have a team of 10 developers, 1 ...
2
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1answer
100 views

DBus proxy Javascript binding issues

Recent Gnome-3 (under GNU/Linux, BSD or other Un*x) offer a gnome shell with nice presentation, but where the configuration and theming are to be done via Internet Browser (and a public URL, on a ...
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1answer
335 views

Files to monitor in linux

All, I have been googling around for different guides on what files to monitor that people would edit for malicious intent. In my readings so far, i have found the common files people edit. so far i ...
4
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2answers
767 views

What are the implications of including binary blobs in the Linux kernel?

According to this there are compelling reasons for caution when installing obfuscated binaries. Knowing this, how can running binary blobs as a part of the Linux kernel be acceptable from a security ...
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4answers
614 views

does switching to linux remove existing computer virus

if you change from a malware/spyware infected windows setup to a linux setup will infections migrate to linux if they were on the computer? (when you are hacked/infected is it the op system that is ...
2
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1answer
222 views

How are IaaS Virtual Machines Isolated?

I am currently examining Hypervisor firewalls for my graduate thesis, but I unfortunately don't have a lot of experience with IaaS environments. How are IaaS Virtual Machines network isolated from ...
2
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2answers
1k views

Is user password in ubuntu 13.04 in plain text?

Is it stored in plain text or not? Where can I find the file that contains the username and password for my accounts in Ubuntu 13.04?
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2answers
170 views

my websites got infected with a malware i cannot get any info on [closed]

we have a server, on which we host about 30 sites. these are test sites for our customers. most of them are not even indexed by google. some run on php, some on nodejs, some on ruby. all of them that ...
2
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2answers
259 views

Can unencrypted keys & logins be kept out of program memory?

No matter what technique is used to store encryption keys & logins, it seems that all roads lead back to program memory (as far as I know), as an unencrypted version of the keys & logins will ...
5
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3answers
338 views

How I can prove that SSH attacks are not from my application?

My ruby on rails web application is hosted on Linode. Linode opened a ticket and blamed my Linode server for attacking other servers. The logs revealed that it's a SSH brute force attack which ...
2
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1answer
195 views

Can linux (be made to) detect foreign connections to the ram bus?

I've been made aware on many answers and some comments that an attacker can read memory while a system is still running by attaching some sort of connection directly to the ram bus. Can linux ...
3
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2answers
3k views

Decrypt from cipher text encrypted using RSA

I am sniffing a client side application traffic and I found some encrypted data. I am not able to decrypt it. Information which I have is Public Key: ...
3
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1answer
119 views

What about AD2P vulnerability?

My goal is to create a simple one-way intercom using B Speech TX2 and B Speech RX2, an Audio2Bluetooth and Bluetooth2Audio converter. My question is, how secure is the audio(in my case voice) being ...
4
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2answers
538 views

Executing arbitrary commands through iptables-restore input

During a pentest I found a way to add arbitrary iptables firewall rules to a server. These rules get applied by way of the iptables-restore command, and I've been wondering whether there is any way to ...
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2answers
831 views

Install Metasploit under Cygwin? [closed]

Is there a way to install Metasploit under Cygwin? Metasploit is meant to be run under a linux environment. The Windows installation doesn't have many tools such as msfpayload available. Please ...
4
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2answers
304 views

Vulnerability testing without the use of exploits?

I was doing some testing on a server to see if it was vulnerable to a 0-day local exploit (the exploit was for gaining root privileges using a bug in the Linux kernel). There was no real information ...
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2answers
204 views

Does glibc2 version of the crypt function still use DES for alternative hashing methods?

I'm trying to understand how typical Linux distributions generate the password field for entries in /etc/shadow. I can't figure out what encryption algorithm is being used to produce the encrypted ...
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1answer
721 views

Cascading Encryption Algorithm using mcrypt or GnuGP

I'm trying to a cascading cipher encryption algorithm to encrypt a textfile via mcrypt. I'm essentially trying to emulate the behavior of TrueCrypt, where it can cascade two or three different cipher ...
18
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0answers
596 views

Where can I find a vulnerable operating system to practice pentests on? [duplicate]

I am looking for vulnerable operating systems that are used for practicing pentests. Damn Vulnerable Linux (DVL) is not maintained anymore. Are there any other simillar OS´s to download somewhere that ...
3
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2answers
340 views

any reason not to run tmux/wemux on a bastion host?

Is there any reason to worry about running tmux/wemux on a bastion host? It seems to me that it would open up vectors to have your terminal sessions hijacked by some locally exploited account on the ...
2
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1answer
303 views

Linux Runtime Memory protection [closed]

I'm searching for a solution to protect process memory at runtime level in Linux (just like GameGuard in Windows). I googled many times but didn't get any useful information. Does anyone know any ...
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2answers
1k views

How to encrypt data on the server?

I have some data on the server (running Linux) which needs to be encrypted (company policy). This data is being served by an application running on this machine. Now I consider a few possibilities: ...
10
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1answer
575 views

Help in understanding an application's crash - exploitable?

Being new to researching vulnerabilities in native applications (as opposed to web apps), I'm having difficulties understanding a crash in Debian's browser, Epiphany (version 2.30.6), and determining ...
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vote
1answer
253 views

Configure Wireshark to capture preformatted data from pseudo-device

So, for a research project, I'm trying to use the HONE project on github, which creates during its module installation two pseudo-devices in the /dev folder. These are called hone and honet, the ...
2
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2answers
249 views

How to protect source code that resides on virtualbox web server which starts at boot?

I installed CentOS 6 on a 3gb virtualbox disk. It hosts a web server which starts automatically when the OS boots. No user login required. When it boots, it is given an IP and the host machine can ...
3
votes
5answers
352 views

Blocking network access to host(s) at the kernel level in Linux?

Getting it out of the way: Not iptables! What I'd like to do is block network access to certain IPs, subnets, and/or hostnames at the Linux kernel level, such that no user, including root, could ...
2
votes
1answer
627 views

What is the actual value of disabling remote root login using ssh?

I have read the answers regarding why you should disable remote root login, but there is something nagging me. Assume this: Scenario 1: Remote server A. Remote root login disabled. Password ...
15
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1answer
9k views

Configure SSL Mutual (Two-way) Authentication

A lot of tutorials, a lot of pages, a lot of question and they differ in implementation of this issue "Configure SSL Mutual (Two-way) Authentication". I have to do it with Linux, and I don't know from ...
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3answers
4k views

Is it appropriate to use haveged as a source of entropy on virtual machines?

While looking for solutions to entropy pool depletion on virtual machines, I came across an interesting project called haveged, which is based on the HAVEGE algorithm (HArdware Volatile Entropy ...
4
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1answer
325 views

Exploited by newbie3viLc063s

My debian server got exploited by some scriptiekiddie who used Newbie3viLc063 http://pastebin.com/jma8JRG1 . Scriptkiddie uploaded logo_php.png to my server (My permissions sucked :s) and he did run ...
5
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2answers
606 views

Using 'sudo vim' to spawn a shell

I've recently read here an answer from a user about the way he hacked a server in a CTF contest. At some point in the description, he said that he did sudo vim and then spawned a shell via VIM using ...
2
votes
1answer
272 views

Bypass va_randomize_space and stack-protector

Is a program compiled with the GCC -fstack-protector option and running in a Linux environment with the va_randomize_space kernel variable set to 1, totally protected against buffer overflow attacks? ...
13
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2answers
563 views

Getting exploit reliability when using the off by one framepointer overwrite on linux

We have a program that is vulnerable to a one byte frame pointer overwrite. The stack is marked executable, the Linux machine has aslr disabled, stack cookies are disabled, and it's a little endian ...
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2answers
192 views

Is this Scenario Exploitable?

Here is the scenario: You get to overwrite 4 (consecutive) Bytes of a Userland Remote Process in Linux without Exploit Mitigation and without the ability to inject any Shellcode and you know the ...
5
votes
2answers
1k views

Securing USB flash drive on linux

We have a industrial system(running on linux) with a USB port. We have the USB port only for copying certain data. Other than this we don't want the USB drive to contain any other executables or ...
5
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2answers
989 views

Linux forensics questions (ssh config, user activity)

I'm a linux noob and have an assignment I'm a bit stumped on... We're given VirtualBox (vdi) images and raw files for the state of a linux server at 3 different dates. We're supposed to answer: ...
2
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1answer
134 views

Force all user processes to be ptraced

I'm implementing a ptrace based tool for logging system call use. It is much more simple than strace, but I'm doing this so I can learn how these tools work. I'd like to trace all user processes since ...
2
votes
2answers
97 views

What kind of privacy leakage do stuff printed to stdout pose?

1- When a program outputs to stdout, is that normally logged anywhere else? 2- When is it an issue to make a command verbose in printing to stdout instead of working quietly or redirecting to a file? ...
1
vote
1answer
737 views

Pre Installed OpenVAS , light way Linux [closed]

Is there any Pre installed light way OpenVAS Linux distributions Or any light way Linux witch Openvas Tested on it and work properly on that Linux distribution ? I have used Back Track (UBUNTU ...
3
votes
3answers
878 views

Using /usr/bin/passwd as login shell

I have a requirement to set up a SSH tunnel between two hosts. SSH server runs on a Linux host, and the SSH client (PuTTY) runs on a Windows host. I have set up a separate user account (say 'tunnel') ...
1
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1answer
619 views

Can exploit vulnerability if program started with gdb, but segfaults if started without gdb

i'm currently trying to exploit a simple program called basic_vuln.c #include <stdio.h> int main(int argc, char** argv) { char buf[64]; strcpy(buf, argv[1]); } I'm using xubuntu ...
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votes
1answer
87 views

LUG war games — suggested strategies? [closed]

My LUG on campus once in awhile holds a mock wargames on a VM. I'm trying to figure a way to get root access and make everyone else not be able to have root (king of he hill). I have a few ideas, but ...
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6answers
1k views

Using linux to combat windows flash drive malware?

I just put an old flash drive which i used with a windows machine into my linux. I noticed many files, mostly exes which were never visible in windows (my windows does not hide hidden files and ...
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2answers
736 views

How to completely password protect login into Ubuntu 12.10?

I am running Ubuntu 12.10 on my laptop and I would like to make a set up such that without a login password, no one would be able to login into my system. Currently it seems that one can, quite ...
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3answers
4k views

Retrieve auto saved Skype password from Ubuntu 12.04 LTS

The email address I used to create Skype profile has been disabled and I can't get it back. Unfortunately, I don't remember the Skype password now. As the password is auto saved in my local machine I ...