Securing Linux systems and applications; understanding Linux security features.

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2
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5answers
53 views

Is it beneficial to run the browser from a different user account for personal devices?

On Linux, when launching the browser does it help security if I don't run it from my main user (not root, but still has my personal information in it) as follows: su FirefoxUserName -c 'firefox' ...
1
vote
0answers
9 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 ...
3
votes
1answer
952 views

Why does the linux XRDP module use a 512 bit RSA key?

Why does the linux XRDP module use a 512 bit RSA key? 512 bit RSA keys are broken by now. How can this be safe?
4
votes
1answer
981 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 ...
2
votes
3answers
114 views

How can I execute shell in this CTF exercise?

I am playing a CTF wargame and unfortunatley got stuck at this level, so I want to "crowdsource" it. No need for complete answer, but hints would be enough. How can I: Make strcmp to be 0 (evaluate ...
5
votes
2answers
124 views

Is there a reason why /proc/interrupts is world-readable?

Reading this recent research paper on how to use information from /proc/interrupts to attack a system, I was wondering whether there is a particular reason why /proc/interrupts is world-readable. ...
1
vote
1answer
29 views

Decypt des-sunos5.7 ecncrypted file by using OpenSSL in Linux

One of the shell scripts in our old Solaris 10 server uses below command to decrypt a file. des-sunos5.7 -d -u -k password enc_filename.tar.gz dec_filename.tar.gz Now we are migrating to RHEL 6 and ...
-1
votes
0answers
32 views

Technique to put highest privileges backdoor on compromised Linux machine and how to remove it? [on hold]

What are the techniques attackers use after they compromised a Linux server to put a highest privileges backdoor to get access back in future? How can I track this type of backdoor and remove it?
0
votes
0answers
25 views

Why isn't ettercap working

I am working on an ARP poisoning/browser redirection project with Ettercap but even if I follow all the steps right it still doesn't work. I tried disabling firewalls too. What I do is: Start ...
3
votes
1answer
82 views

Hidden service security SSH

Pretend I have a Tor hidden service. For ultimate security I would firewall the internet entirely, except for Tor, to try to reduce IP address leakage and other security risks. My problem is how ...
-6
votes
0answers
20 views

(kali SET)Why not connet another network and Why not write keylogger in (.txt) ??? [on hold]

SET version 7.1.2 [] Cloning the website: https://login.facebook.com/login.php [] This could take a little bit... The best way to use this attack is if username and password form fields are ...
-4
votes
2answers
57 views

Safe to connect a USB to Linux?

A "friend" offerred me a USB with files. I plugged it into my Ubuntu (version 12 or 14, don't remember) PC and an error appeared (don't remember exactly what was written..). So I wasn't able to browse ...
3
votes
1answer
141 views

Air-gap implementation for personal computer use

I recently read over Bruce Schneier's article on setting up an air-gapped computer and am looking to improve my setup (compared to my current "use one Windows PC for everything" model). The main ...
0
votes
1answer
24 views

Using virtual server for backing up files

I've purchased a virtual server which I need to run some custom tools every once in a while. I actually don't use any server features of my virtual server, I really just need a Linux machine which is ...
1
vote
1answer
34 views

How are DNS requests sent when using ovenvpn? Are they encrypted?

I use openvpn in thru the gnome network manager. When my computer is connected to the vpn do DNS requests look like they come from the vpn exit ip or from my real ip? Are the DNS requests sent in the ...
-1
votes
1answer
474 views

SQLMAP --OS-SHELL error [closed]

root@kali:~# sqlmap -u http://www.a***********.com/info.php?id=2 --os-shell _ _ _| |_____ _ {1.0-dev-nongit-20150907} | -| . | | | .'| . | || |||||,| | || |_| ...
0
votes
3answers
621 views

Removing a Redirect Virus from Fedora Linux

Despite several attempts listed below certain websites are getting redirected to a certain ad website automatically, out of the blue on linux. When some website starts redirecting to this ad website ...
6
votes
1answer
524 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 ...
0
votes
0answers
24 views

Linux server just as RAMdisk [migrated]

I want to setup an anti-forensic Linux server to protect my users. My aim is to have the Linux distro and everything inside of it running from RAM, never storing anything permanently. It is possible ...
1
vote
1answer
111 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
2answers
226 views

VMware VM run on insecure 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 ...
1
vote
3answers
237 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 ...
0
votes
2answers
494 views

How exactly does this Flash malware function on Ubuntu?

In this video, an experienced Ubuntu user manages to infect his system with some sort of malware. This is the first example I've ever seen of truly successful malware in the wild aside from privilege ...
1
vote
0answers
26 views

How to secure Linux terminal with Google Authenticator? [migrated]

How to secure Linux terminal with Google Authenticator for root access and login?
0
votes
0answers
3 views

Subuser Docker firefox image [migrated]

I followed all the steps to create subuser given on subuser.org I am not able to create firefox image and not able to restrict the access to the Downloads folder as given in the video and ...
0
votes
0answers
29 views

Why there is no shell prompt by exploiting this script?

I tried to get a shell prompt in the following vulnerable code, I think that I found the vulnerability, actually it is a simple stack buffer overflow, but now I have a problem with exploiting the ...
0
votes
0answers
15 views

Process of auditd -s enable/disable persists for a long time

I have setup auditd on my system, with some basic rules from CIS Benchmark paper and the following auditd.conf file: log_file = /var/log/audit/audit.log log_format = RAW log_group = root ...
27
votes
11answers
6k views

One liner to create passwords in linux?

How do you create a readable password using bash with one line? What if i'm looking for 128 bits of entropy? EDIT By readable I mean the 94 printable ascii characters (without space). It can use ...
9
votes
5answers
2k views

Can we trust the information displayed by the linux utility commands for a vulnerable machine?

After checking a vulnerable linux machine for rootkit and deleting them, we need to get some informations about the process , port ,incoming or outgoing connections... , using some useful commands as ...
3
votes
1answer
90 views

How use snort with local.rules in offline mode?

I'm using SecurityOnion distro and I would to run snort on my pcap files. Is there a way to specify just one rule? I couldn't understand whether local.rules is used. How can I show only the result ...
1
vote
1answer
63 views

How does this privilege escalation vulnerability on Elastix work?

Here is a privilege escalation vulnerability on Elastix: # id # uid=100(asterisk) gid=101(asterisk) # sudo nmap --interactive # Starting Nmap V. 4.11 ( http://www.insecure.org/nmap/ ) # Welcome to ...
1
vote
1answer
40 views

Is there a functional difference between `chage -M 99999`and `chage -M -1`on Linux?

My group just requested a security scan on some of our development systems and were informed that a number of system type accounts were insecure because the password did not have a maximum time limit. ...
4
votes
1answer
204 views

Pros and cons of disabling TCP timestamps

So, lynis informs me that I should unset net.ipv4.tcp_timestamps. I know that's a bad thing because an attacker could figure out which updates that require restarting the machine I haven't applied, or ...
2
votes
3answers
785 views

Apparmor system-wide security — white-listing

I want to only white-list applications that can run on my system using Apparmor, I know it is used to confine applications/programs based on their path names, but what I need is to contain those ...
18
votes
6answers
4k views

Why is it considered safe to install something as a non-root user in Linux environments?

We always hear it is safe to run unknown programs as non-root users in Linux because non-root users are sandboxed from the system level and can't change anything out of their permission scope. If ...
0
votes
2answers
335 views

How to prevent the latest ImageMagick vulnerability?

According to the CVE-2016–3714 there are a some vulnerabilities in the ImageMagick program (4 packages) : Insufficient filtering for filename passed to delegate's command allows remote code ...
2
votes
3answers
61 views

Mutual authentication of SFTP server

We can use public/private key pairs for client authentication when connecting to a SFTP server. Can we also have mutual authentication so the client also verifies a public key from the server? Both ...
0
votes
1answer
222 views

My server was hacked and I am asked to pay to recover my files

Today I got a message when I logged on the server: Hi, please view: http://pastie.org/private/tlixxvclirxmut6djqyacq for further in ...
5
votes
3answers
509 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 ...
1
vote
0answers
25 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 ...
1
vote
1answer
88 views

Raspberry Pi IDS/FireWall - Should I? [closed]

I was excited to setup an IDS/FireWall with my new Raspberry Pi on a standard home network. Reading threats to SSH and Linux, now I am not so sure. Setup by an experienced amateur I'm now concerned ...
20
votes
4answers
4k views

Is VLC on Linux vulnerable to an attack from .wmv files designed to install viruses? [duplicate]

I was stupid and did not check a video file I downloaded from an untrustworthy source. It was .wmv file with no readable properties of the video. I know that .wmv videos can download viruses. What I ...
0
votes
1answer
109 views

Block OS fingerprinting without using iptables?

I have a Linux machine connected to a Windows 98 PC on port 104. Now I want to block the OS fingerprinting using nmap for the windows 98 PC. I tried using iptables (blocking that particular port) but ...
5
votes
2answers
337 views

Decrypting SSL using Wireshark on Linux vs Windows

I'm working on decrypting my own traffic that gets sent through Wireshark and I've been following this guide for reference. I have been using the SSLKEYLOGFILE environment variable and I can get the ...
1
vote
1answer
109 views

Is it possible to use the Linux “echo” command maliciously?

While testing a web application today, I came across a function that passed arguments to dig in linux terminal. After some fiddling about I was able to pass the echo command using pipes and echo my ...
9
votes
0answers
103 views

Prevent keyloggers on Linux?

Are there any mechanisms in the Linux desktop architecture to prevent malicious software keyloggers? What would be an ideal Linux setup to make it very difficult for an attacker to install a keylogger ...
0
votes
1answer
32 views

Does KDE System Tray Extra Items “Clipboard” have the same security threats as the system clipboard?

Does the clipboard under kUbuntu's KDE System Tray > Extra Items "Clipboard" have the same security threats as the system clipboard? The following articles point out the insecure nature of the ...
0
votes
0answers
3 views

Why ecryptfs still remain in mtab? [migrated]

I use ecryptfs for encrypted lxc container container start ok and stop ok But i see even after stop this line /var/container-lxc/face/rootfs.crypt on /var/container-lxc/face/rootfs type ecryptfs ...
0
votes
0answers
22 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 ...
1
vote
1answer
33 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 ...