Securing Linux systems and applications; understanding Linux security features.

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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 ...
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1answer
323 views

Dual Linux System with Whole Disk Encryption

(This is a continuation of my question on Ask Ubuntu.) My goal is I want to have a Xubuntu/Ubuntu dual boot, with a catch - I want the disk to be fully encrypted with the dm-crypt (native supplied) ...
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1answer
156 views

Does pppd encrypt traffic?

There is pppd program that can be used to create point-to-point conections over various channels (including other network). It supports authentication and compression. But does it encrypt traffic or ...
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1answer
112 views

set uid for reboot binary & pm-suspend : security hole?

I think all the question is in the title : For the use of my laptop to be more convenient I made a chmod 4755 to /sbin/reboot and /usr/lib/pm-utils/pm-action so I don't have to make a 'sudo' before ...
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2answers
143 views

How to forbid one directory only in TOMOYO (2.5)?

(For example) I want to restrict write access to /home/backup from anybody, except a particular backup script. (To protect from accidental deletion.) For this, I suppose, it is enough to have two ...
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799 views

Why does the OpenSSH client on Mac OS X silently launch an ssh-agent for the user?

I'm confused by the difference in behavior of ssh clients I'm seeing on two different hosts. Just to be clear, this is the scenario: "macbox" OS X using OpenSSH_5.2p1 ssh client "sunbox" Solaris 10 ...
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1answer
87 views

How many connections can TCP_WRAPPERS handle?

As we know that TCP_WRAPPERS is a good way of security on linux/unix system, to disallow or allow remote user to connect to the specific services. Assume that if there have a large number of ...
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1answer
23 views

How to best manage multiple applications using the internet with Firewall

Im not new too Linux (Ubuntu 14.x) however I must admit that I have never bothered with a Firewall until now. Im currently using Ubuntu's inbuilt firewall (UFW) with a graphical plugin (GUFW), which I ...
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22 views

web view addjavascriptinterface exploit

I have been banging my head around this for almost 56 hours now (+/- a few that I took out to have a couple of naps and RedBulls) and have not been able to get anywhere with it so far. I am trying ...
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1answer
16 views

Does altering the routing table to my hub defeat the purpose of a VPN?

I am running a VPN on my server with openvpn. When running openvpn I have a shell script that runs afterwards: ip rule add from 192.168.0.19 table 128 ip route add table 128 to 192.168.0.0/24 dev ...
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31 views

Error Running command shell :TimeoutError Operation Time out

I am Testing a Payload linux/x86/meterpreter/reverse_tcp in my Test Linux network to Exploit, I got a Meterpreter Session by Metasploit using it, I tried several commands like getuid, cat and all ...
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28 views

Can linux cgroups and namespaces assist hiding malware?

Reading about sandboxing/security possibilities I was looking a bit into cgroups and namespaces and asked myself: How do I know that my linux root account is indeed the real root account and not ...
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27 views

Inserting XSRF header token in Hydra

I'm trying to break a login form with Hydra. The site is built with the Angular framework, and an XSRF token must be sent through the header and through the POST request. I notice that the XSRF ...
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1answer
47 views

Defense-In-Depth With Common Security Controls

Many operating systems implement system capabilities, Posix access controls (DAC/ACLs) and mandatory access controls (SELinux), each using different underlying security controls to provide individual ...
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57 views

Default accounts shutdown, halt, and sync - still shipping?

I'm curious as to whether, and if so why, Unix and Linux distributions still ship with default accounts shutdown, halt and sync. Specifically (from a Red Hat document), sync:x:5:0:sync:/sbin:/bin/...
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27 views

Port Knocking origination matching problem

I set up port knocking using first this method using knockd and then I tried using this method using only iptables directly but when both failed I thought I'd check a bit deeper into the problem. ...
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2answers
37 views

Would saving GPG and SSH keys as another user improve security?

Since e.g. SSH keys under Linux are owned by the user who created them, any applications running as the user, e.g. a web browser, should be able to read them from the ~/.ssh folder. Say that there is ...
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39 views

How does text that is displayed with cat end up trying to execute in the Linux terminal? [duplicate]

Sometimes you accidentally "cat" a binary... only for your terminal to become utterly corrupted, ending up in another code page where all characters are unrecognizable, while your shell spits back at ...
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1answer
129 views

Detect port scans on Linux (centos) [closed]

I have OSSEC installed on my hosts. I want to detect port scans and generate an alert in OSSEC. So, how can I detect these port scans? Is it possible reading iptables logs? Do you recommend some ...
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65 views

Is that a way break Linux user password by bypassing grub protected?

The best way to delve into others Linux machine is by editing the grub. Many will start by, editing the line ro quite splash as rw init=/bin/bash during the startup (usually by pressing button e on ...
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16 views

Where can i find information about Ipsec Xfrm framework?

I have searched online and found very little information about the ipsec xfrm framework, including the book Networking implementation and Theory.. Where can i get more information about xfrm ...
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0answers
71 views

From xss to rce in client side [closed]

I found a desktop application in Linux w/c getsvand that displays items from site xyz. xyz is vulnerable to XSS and code injected there is also executed on client side's desktop app.similar to this ...
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58 views

Under which circumstances is the default security profile of XRDP considered okay?

In xrdp.ini, the base install of xrdp on my raspberry pi*, there I have the following below. I changed crypt_level to high. [globals] bitmap_cache=yes bitmap_compression=yes port=3389 crypt_level=...
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1answer
79 views

Debian 8 and few questions about Graphical Firewall?

I have installed Debian 8 today, and so far so good. What I want to achieve now is to install firewall but can't find Firestarter in repos (discontinued ?). So, I have installed a GUFW and set it up. ...
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1answer
113 views

Automate certificate signing in Linux

In a private network I wish to automate signing for new clients/servers. Something like this: New client is created (dockers & etc) The client create a new private key and a CSR The client send ...
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252 views

Converting Metasploit module to standalone Python script [closed]

How easy is to convert Ruby code to Python code and to change Metasploit module into standalone Python script for Linux?
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33 views

iptable ip_conntrack_max testing

I was trying to understand how ip_conntrack_max works so i have created two VM and set ip_conntrack_max to 10000 I used hping to open 10000 udp connection on VM using following command hping --udp -...
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441 views

Volatility Framework 2.4 - No suitable address space mapping found [closed]

I made some dumps with different formats (.DMP and some file made by LiveKD utility) in Windows 8.1 x64 OS. The first one is a explorer.exe dump file which was created by TaskManager->Create Dump File ...
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263 views

Snort alerts analysis (web interface) [closed]

I have a question about Snort (or maybe any other IDS/IPS, any working solutions would be ok). The goal is to set up some web interface providing a way to view the whole TCP stream packets of each ...
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0answers
37 views

unable to execute shellcode,which is place on stack [duplicate]

I am trying to execute the shellcode to spawn an "sh" shell. I have taken shellcode as command line arguement,copied it to stack and tried to overwrite the return address of main function with the ...
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3answers
283 views

About SHA1 in default Disk Encryption in Linux

Link to the thread: Recommended options for LUKS (cryptsetup) I wonder what's the exact difference between SHA1 and SHA512. I know that SHA512 has a longer key but I've read that it doesn't matter ...
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1answer
211 views

Domain socket authentication as in MySQL and PostgreSQL secure?

Are authentication mechanisms based on UNIX domain sockets (Linux) secure? And more specifically, are the respective MySQL and PostgreSQL implementations on Linux secure? The background for my ...
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175 views

IPtables accepting SMTP without being configured?

While setting up the IPtables rules for a new server, I set up Postfix and send an email to try it out. To my surprise the email arrived without me declaring a rule for the port in IPtables. ...
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334 views

How should I configure my Tor-dedicated firewall for optimum security?

I'm setting up a Tor-based isolating proxy using the 'Anonymizing Middlebox' iptables rules specified here: https://trac.torproject.org/projects/tor/wiki/doc/TransparentProxy i.e. iptables -t nat -...
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1answer
87 views

How to fuzz shared objects?

I know there have been similar questions about that topic, but I think mine differs from the others. I have this application which I am able to crash, but the error seems to happen inside of a shared ...
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81 views

Is CVE-2011-1571 fixed in tomcat?

I dont see any record of CVE-2011-1571 being fixed in tomcat based on ASF' security reports for tomcat itself. Usually they specify the CVE number and information about the fix. This was 3 years ago ...
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36 views

Tracking checkins from generic users

Im trying to implement a better system to monitor checkins to our repository. We have some generic users everyone can use, I have recently disallowed them from checking in as those users however there ...
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0answers
297 views

Linux Physical memory analysis using hexeditor for Forensics

I am about to forensics investigation of a linux physical memory. I have dumped an ARM Linux which the profile is not listed in Volatility, so I could find the process and the latest command using ...
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0answers
65 views

How do I determine whether a Linux-based router still has the default password? [duplicate]

My goal is to check if the password used by admin is the default password. I work on a Linux-based router. I know the password is stored as a hashed value in /etc/passwd. In generic Linux machines, /...
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0answers
129 views

What are some good design practices for cross-platform certificate storage?

Question from the Bouncy Castle development list: At present we use the Windows certificate store as: var store = new X509Store(StoreName.My, StoreLocation.LocalMachine); store.Open(OpenFlags....
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3answers
852 views

What is the most secure way to set up web server user permissions? [closed]

The default Debian way of setting up a common web server (Nginx) is to run the main process as root and unprivileged workers as www-data. In order to allow for the worker processes to read/execute web ...
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0answers
246 views

Tools to perform benchmark of block/stream ciphers on Linux? [closed]

I would like to perform some benchmarking of different block and stream ciphers for general data (lossless and lossy data) encryption and decryption (with focus on power consumption). To get general ...
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1answer
60 views

How to distinguish malware from system crash?

Recently, I browsed to a website, which appeared to consume all the computer's resources. Although the mouse cursor continued to move, the browser (and other applications) slowed down fast and soon ...
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2answers
925 views

Centralize Linux System Management

We currently maintain several linux servers and are looking to employ sub contractors. However, we wan't to keep tabs on who does what on each server. Other then creating sudo accounts on every server,...
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2answers
2k views

How to defeat ASLR in linux kernel? [duplicate]

Possible Duplicate: Stack Overflows - Defeating Canaries, ASLR, DEP, NX is there anyway to disable ASLR in Linux kernel 2.6.32-71.el6.x86_64, with Apache privileges?? I tried this commands: ...
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2answers
195 views

Why should one bother encrypting the harddisk in linux if one can easily recover the root password?

If you have physical access to a machine, it's pretty straightforward to recover the root password thereby skipping the whole point of having an encrypted drive. Am I missing something here? EDIT: ...
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3answers
226 views

How to retrieve a site whose server is running Linux

I'm struggling to find a way to retrieve through Google a list of sites having Linux as their server operating system. Actually, I'd like to be able to test the following command: nmap -O www.....(...
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1answer
177 views

Is BSD more secure than GNU/Linux? [closed]

BSD controls the OS while Linux is just a kernel. BSD is less popular than Linux, but which one is better in terms of security?
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680 views

How can I use netcat like ping?

How can we use the netcat (nc) to determine whether a particular machine is running web, mail or SSH services?
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204 views

php- is my code secured enough to protect from remote command execution when using shell_exec()?

I am using shell_exec function on the following variables to execute commands on the shell: fname (characters only) fpack(characters only) email (a valid email address) My code is: <?php ...