Securing Linux systems and applications; understanding Linux security features.

learn more… | top users | synonyms

2
votes
1answer
178 views

Security of LXC compared to OpenVZ

For years, I'm now using OpenVZ on my server, but support discontinued for Debian and Ubuntu, current releases seem to focus on LXC now, which is not a bad idea from the point of comfort. But what ...
1
vote
1answer
70 views

Snort even though working properly does not report majority of rules

I have installed Snort 2.9.7.0 and it does not detect majority of attacks, such as nmap port scans, downloading exe files, opening documents containing keyword "root". I use Snort together with ...
-1
votes
0answers
41 views

Are there any vulnerabilities specific to Kali Linux? [on hold]

While vulnerabilities exist for Debian and it's standard application set, my question is if there are any specific to Kali Linux and it's standard set of applications (including attack tools). For ...
0
votes
2answers
118 views

Vmware over unsecure os

I run VMWare with Linux through my Windows OS. I want to use the Linux VM for online transactions. Is it possible for a virus, spy or worm to attack my Linux VM from the Windows host? Is my Linux ...
-4
votes
0answers
26 views

how to capture wpa handshake on wireshark [on hold]

how to capture wpa 4 way handshake using wireshark can you give me a step by step tutorial . I'm using wireshark on ubuntu 14.04
1
vote
0answers
12 views

How to configure pam to use with two different passwords? [migrated]

Goal: I want to configure pam to use regular user password (pam_unix.so) and extra password. (with success only when I type both passwords correctly and deny (pam_deny.so) in case I type only one ...
7
votes
1answer
220 views

Bootstrapping an EC2 Spot Instance

I'm considering using EC2 Spot Instances in an automated fashion (ie create a script that will request EC2 Spot Instances that will run unattended). For this specific use case, I'm happy to lock down ...
7
votes
1answer
58 views

Is it possible to emulate real network printer i.e. to run some actual firmware in VM?

I've got to the section related to network printers exploitation while going through one security course. Under "network printer" I understand standalone devices with a dedicated ethernet\wireless ...
0
votes
2answers
53 views

Setting up a security lab, looking for a little guidance [duplicate]

I'm new here. Over the past couple of years I've had a growing interest in the security aspects of IT/CS. Recently, I've started setting up a lab for myself based on a kali/win7 dualboot and I've ...
0
votes
0answers
19 views

What is the most effective way to block IP address in Application Layer? [migrated]

I understand that most Routers/Firewalls are able to block IP tables in the network level. IPtables for instance is quite effective. However, I want an application layer IP block.I have an HAproxy ...
1
vote
1answer
149 views

Securing a VPS network with a VPN and a DMZ

I've got several VPS boxes (Digital Ocean boxes w/Ubuntu) that I would like to lock down from the outside world. I want to have several private boxes (web servers, db servers, puppet/master boxes ...
9
votes
4answers
3k views

How to detect Meterpreter and similar malware?

Is it possible to find Meterpreter or similar malware which doesn't modify the hard disk but is only stored in RAM? Most common anti-rootkit software like rkhunter and chkrootkit don't find it.
0
votes
2answers
49 views

Questions regarding Bad USB exploit

I own a Netbook and my external DVD Drive is possibly infected with Bad USB. If i install Ubuntu using this infected DVD drive could my system be taken over during installation process or later when ...
0
votes
0answers
19 views

Seafile putting mysql access passwords in clear text in multiple files [closed]

I just installed seafile (http://seafile.com/en/home/) and am shocked to see that these files: seahub_settings.py and (if one weren't enough...) ccnet/ccnet.conf do store your sql database ...
5
votes
3answers
1k views

Is GPG suitable as part of a password manager and generator?

I assume that GPG is very strong to crack, guess, etc. Since I have confidence in GPG, would it be appropriate to use my GPG key as the master key for a password manager or generator?
0
votes
1answer
45 views

Linux Updates to Shellshock

My question is about the community response to Shellshock. What improvements were made in either the Linux development cycle or in the recommendation to its users to prevent something like ...
1
vote
1answer
203 views

Log information for SIEM auditing in Linux

How can I know what all types of events generated by Linux. I can get this from the logs, but reading logs and noting ID's is very time consuming. All events might not be triggered. I need this ...
0
votes
1answer
44 views

Gnome-keyring iteration count location

I know that Gnome-keyring hashes master password between 1000 and 2000 times. It picks random number. I would like to ask where does it save this number, what is the location of that file? As far as I ...
-1
votes
2answers
49 views

Server Files Got Exposed, What Security Steps Should I Take? [duplicate]

so I made a script that would accept a GET request through a script on my page download the url in the GET and then echo the response. Sort of like an in browser proxy. Basically someone found out ...
2
votes
1answer
62 views

exploiting Heap Overflow in gdb segfaults

I have been trying to exploit the heap overflow vulnerability for the program below, I am running Linux 14.04. #include <stdio.h> #include <string.h> #include <stdlib.h> int n = 5; ...
2
votes
1answer
271 views

How does SELinux affect the Linux Kernel networking stack?

I'm interested in how SELinux effects the processing of packets through the networking stack. I've found the following questions and answers: Network policies under AppArmor/SELinux Filtering ...
1
vote
1answer
622 views

GnuTLS ServerHello exploit (CVE-2014-3466) - how to verify?

So pretty much all of the GNUTLS world is worrying about CVE-2014-3466. I checked my Kali and it responds with this - # apt-cache rdepends libgnutls26 | grep -v lib Reverse Depends: ...
0
votes
1answer
41 views

is return-to-libc attacks possible Now?

I'v read that to make a successful return to lib-c attack, the attacker should store the address of the command (for example "bin/sh") in stack exactly after the return address to 'system' function ...
-1
votes
2answers
34 views

How can I detect mode interface of other machine is promiscuous [closed]

I have a project that is to protect my box from attack man in the middle arp poison. I should detect if interface mode of other machine is promiscuous. I must write script python or command linux.
2
votes
1answer
62 views

How to find stack pointer for overflow bug?

I've read that stack usually starts in same address so the attacker may guess the starting point of the buffer to overflow. This is necessary to know this address to make the malicious code run. I ...
0
votes
0answers
13 views

I Use Precompiled Open Source Software. Is There a Backdoor? [duplicate]

I'm new to Linux world (3-4 months with Linux). But I did compile some programs from source and had one failed attempt to compile a custom Linux kernel. One thing that I'm wondering about is the ...
4
votes
1answer
63 views

Is symlink race a very common vulnerability in UNIX systems

As far as I know, when I am creating a new file or directory in a directory that can be written by multiple users (and thus an adversary can have made a symlink there), the only way to protect myself ...
0
votes
1answer
88 views

Why my files that Encrypted with EFS in Windows 8.1 shown in Linux ubuntu?

i Encrypted my files with EFS in windows 8.1 so i logged in ubuntu and without any warning , its shown my files actually not Exactly the file but shown the path of file and the name and i can ...
0
votes
0answers
124 views

Discovered unexplained large salted files in root folder on Linux, possible keylogger?

So I had Linux Mint running on my laptop, just installed it a month ago. It has a small hard drive, just 160gb, and I noticed shortly after installing the system, it ballooned to 80-some gigabytes ...
1
vote
0answers
28 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 ...
3
votes
1answer
87 views

OpenSSH downgrade attack

I have tried to implement a downgrade attack against the SSH protocol as the first steps (encryption protocols exchange) are not signed, as per RFC4253. The idea is to intercept (mitm) these steps and ...
2
votes
3answers
522 views

Can I use 777 file permissions inside server virtualisation (that only I have access to) without worry?

For this question, please assume I have followed every possible security measure to secure my Linux server. Only I have access to the web server via one open SSH port. If there are security issues ...
2
votes
3answers
135 views

Is it okay to only use username/password to secure an admin page for moderating a website?

Is there a standard practice to securing an admin page for an application written in angular and nodejs or just in general? The admin page would approve/ban users and moderate comments. Should it be ...
0
votes
0answers
9 views

Monitoring Linux system Calls (efficiently) [migrated]

What is the fastest way to monitor linux system calls and log them to a file? This post has some great info: Monitoring system calls (in a reliable and secure way) It's seems that the Audit ...
1
vote
1answer
45 views

NMAP Scan Returns Odd OS Detection [closed]

I am new to NMAP but I was using it to troubleshoot some issues I have been having. I ran a scan on a device and I know the device runs some sort of Linux or Ubuntu OS and I was attempting to figure ...
1
vote
1answer
84 views

Is End to End encryption possible for all servers across the whole infrastructure?

Running into a possible situation where a client I am working with is requesting that all data that leaves the servers should be encrypted and here, we are talking of hundreds of Linux servers ...
2
votes
1answer
247 views

Current industry standard key management solution for web app on linux host

The scenario: Data is sent to an application server and you want to selectively encrypt some data before sending it to a DB server for storage. All servers run some linux distro. This is a relatively ...
2
votes
1answer
356 views

How to measure the integrity of the OS (Linux)?

I am working on a project which requires Integrity measurement of OS (Linux). One way to do that is using IMA but I am not sure if it fits in the scenario below. The scenario of the project is some ...
4
votes
1answer
22 views

What security problems does copying .Xauthority to another user present?

If I want to use a GUI application with another user (example: webbrowser), I can copy the .Xauthority file to that given user's home then I can "su - user" and start the GUI app. Question: but what ...
2
votes
1answer
44 views

Ideas on how I can fragment captured network traffic?

I am trying to create a lab environment where I can analyze common IDS solutions (starting with Snort specifically) and their ability to reassemble fragmented IP trains. I have a collection of ...
0
votes
0answers
2 views

Prevent children of process protected by seccomp from having same seccomp protections? [migrated]

I'm writing an application which is protected by seccomp. This application uses fork() and then execvp() to run certain programs. It seems as though any child process of my program will be constrained ...
4
votes
2answers
109 views

Is there a way to check for “hollow” processes, or malware hidden within “normal” processes

I recently came across an article on the The Verge, which centers around the concept of commercial malware production and how it's used around the world. The article introduced me to a number of ...
3
votes
0answers
21 views

How do I request a certificate from CEP / CES on a Microsoft CA on OSX or Linux? [migrated]

This article describes how to request a certificate from AD CS (Active Directory Certificate Services) from a non-domain joined windows computer. I would think the same principals apply to non ...
1
vote
2answers
102 views

How to change default cipher in GnuPG on both Linux and Windows?

How can I change the default symmetric cipher used by GnuPG from CAST5 to another? I'm using GPG4Win on Windows, but would also be interested in a solution for Linux.
2
votes
2answers
72 views

What are the security risks in leaving 'sudo' inside my production code?

I have a script that can only run successfully with root permissions But in development it's really hard to run with root permissions (in my development environment) so I add 'sudo' when ever it's ...
0
votes
2answers
444 views

Tails OS for Android and PC?

Can I use Tails OS on a USB-stick on both an Android tablet and a PC, or do I have to have two different versions? Would I have to go into the BIOS to make this work?
1
vote
1answer
81 views

Read SSL Certs with user process

I am running my own server, on which I have different services (Nginx etc.). All these (internet) services are / should be secured with SSL (offcialy signed). The key files / certificates are located ...
0
votes
1answer
55 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 ...
4
votes
1answer
95 views

Linux/ssh - Forensic question

In a Linux terminal, I made a ssh connection from A to B and I used commands to read some files stored in B. Then I disconnected and I closed the terminal. Is it possible to find on A, informations ...
0
votes
1answer
41 views

Are paravirtualized drivers a security risk?

Below is a copy of my answer that I gave in some other thread (Would running VMs inside of VMs be a more secure way to study viruses, etc?) about a topic of security of nested virtualization. I would ...