Questions tagged [ubuntu]
Ubuntu is a Linux version derived from Debian. For questions about Ubuntu that are not about security, please post on [AskUbuntu.SE].
305
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Is my website under attack?
I have a web server. I was investigting why my nginx is keep crashing. I noticed a few other issues in my logs.
Note: In the log report, I replace the name of my website with example.com and my second ...
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Clarification on vulnerability statuses
What do statuses of Ubuntu and Debian security trackers mean exactly in plain of definitely vulnerable\definitely not vulnerable\unknown?
I have found this answer How to read CVE - 2016 - 5696 ...
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Format a probably infected USB, is it safest Ubuntu live or Ubuntu installed?
I have an USB drive that probably is infected. I have a PC where currently I have not any partition, just an "empty" PC and I have a CD with Ubuntu 22.04. I would like to copy USB data, ...
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Is it possible to add a username a password to a hostname in /etc/hosts? [closed]
Is it possible to add a username a password to a hostname in /etc/hosts?
Like: a.b.c.d username:password@hostname
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Can you configure Tripwire to produce an actual diff between modified files
I'm using the open source version of Tripwire on Ubuntu 22.04. Right now when a file is modified Tripwire will document this in the integrity check with an "Expected" vs "Observed" ...
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3
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Understanding suspicious HTTP GET Request
I was looking through my Apache log files and besides other GET requests with response status codes of 4XX (error), I've found this one which has a 200 (success) response status code:
"GET /?...
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62
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Is it safe to download and test EICAR test file [duplicate]
I need a sample malicious file that I can work with but does not harm my system. When I checked through the internet I found there is a file called EICAR test file. I am using Ubuntu 16.04 LTS. Can I ...
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Making time(0) produce an error
I'm currently reviewing/reversing a software (coded in C) and it has a line like this :
time_t var = time(0);
My goal it to get this time(0) call to return -1.
(I cannot modify the parameter.)
...
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1
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63
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Ubuntu vs. Debian SSH public key login
In the Debian 9 server I have, these are the least restrictive permissions I can set for SSH login with public key to work:
/home/user 775
/home/user/.ssh ...
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3
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205
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Can Windows invade my privacy by accessing files from my Linux OS?
I have a 500 GB SSD drive with Windows 10 installed, and a 250 GB SSD drive with Ubuntu 22.04 installed. I use the latter mainly to maintain my privacy; Ubuntu is like my personal computer, with ...
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What are the potential risks of being able to navigate to any arbitrary directory on a web server?
I opened the access to a certain directory via SSH/FTP. Some adjustment to my web project is necessary, so I have organized an access for a programmer.
The problem is that the command "cd" ...
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How to analyze/monitor OSSEC logs on Ubuntu
I'm using OSSEC server to monitor machines with OSSEC agents, which monitor this login via SSH, file creation, etc.
I have configured OSSEC to send an email when it detects a problem, but this control ...
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File traversal vulnerability found on Ubuntu server running a node process using Nessus
I have an Ubuntu server running a normal Node express framework app and a vulnerability was found by a tool called Nessus.
It looks like a pretty standard issue to me, and I will have shell access, ...
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safely storing untrusted files on a trusted machine
given a collection of files (text and binary) that are likely to have been modified by a resourceful and motivated adversary in a targeted attack, is there a security risk to copying that collection ...
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Clamav identifies Certbot files as infected
I ran Clamav on an Ubuntu 20.04 machine and it identified ten Certbot files as infected.
/snap/certbot/1670/lib/python3.8/site-packages/pip/_vendor/distlib/t32.exe: Win.Malware.Generic-9937882-0 FOUND
...
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How to locate a malicious script in the Linux system
I would like to ask for some directions to trace back to the original (malicious) script on my system (Ubuntu Server). I would try to be more specific if needed. If the question does not fit this ...
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How do I activate a malware inside a virtual machine?
I have been doing research on malware detection and my current setup is: one host OS (Ubuntu 18.04) and one guest OS (Ubuntu 18.04) inside VirtualBox. I have downloaded and executed some malware (...
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LAN Only Webserver
I am on a 192.x.x.x network and have a local server that hosts some webapps for the local users of the network. The server is running:
Ubuntu
VPN
Nginx Reverse Proxy with the site.conf including: ...
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1
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178
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How to make sure my laptop (Ubuntu 20.04) is secure with a Windows 7 VM?
I have an old laptop which is running Ubuntu 20.04 and I am planning to use a virtual machine of Windows 7 Pro (using VirtualBox maybe). As its an old laptop and not my primary source of using the ...
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134
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Decompile a binary virus/worm
We got hacked, someone got access on our VPS machine. There are no ssh logs, there are no auth logs. There is no actual trace of remote access (that I could find and I'm not a security expert but I'm ...
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How to do a post-mortem after being hacked [closed]
I am wondering what the general steps are in retrospect for trying to find out how one ends up being hacked.
A couple of times I have had Linux servers that ended up being hacked. I noticed this in ...
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Cipher, for a rookie, what's safe and not safe 2021?
I'm a rookie in the cipher world, and I'm setting up squid as an TLS proxy. in an example it uses:
cipher=EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:...
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282
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How to check TCP sequence number to detect mitm?
I suspect that my router (I'm using an iPhone as router) has been owned and the attacker is making some kind of mitm attack. I suspect also that some html and js code has not been sent to my laptop ...
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Is VLC from the Ubuntu LTS official repository insecure?
Often it is impossible at first sight to understand if a package in a repository is up-to-date with security fixes, because the maintainers use a different naming when applying the patches to old ...
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Are Ubuntu Snaps more secure than the classic installation method from the official repos?
Today Ubuntu (and some other distros) offer a new way to install software, which is snaps. It's software packaged with all its dependencies, run with some kind of containerization, and auto-updated. ...
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How should GNU/Linux noobs harden their dekstop OS?
I'm interested in using GNU/Linux for different reasons. Partly for freedom, privacy, and security. But also to force myself to learn Linux. One issue I’ve found is that desktop Linux seems to have ...
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Should I change the default folder for uploads?
PHP 7 uses the default system folder (/tmp) to store uploaded files.
PHP allows you to change the settings and change the upload destination directory. Some sites indicate to change this folder to ...
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Is there an effective way to disable root access on linux in an office setting
I'm currently working for SaaS a company and as part of a security audit we were advised to remove all administrative access from all laptops/end-user pc's for a Principle of Least Permissions.
Is ...
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201
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Mouse moving while unattended, how can I check for intrusions
A few hours ago, I spotted my unattended mouse moving and seeming to click on tabs. I promptly rebooted my system and removed Teamviewer (it's the only remote connection app that I have installed), ...
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Concerning GET request in logs
I have a Django application running on a Digital Ocean Ubuntu server. I am using NGINX and Daphne to serve the application because I am using Django Channels.
My websockets keep crashing, and I ...
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How is it possible for boss to know I am finding a job?
Today, when my boss talking with me, he suddenly said: No you don't need to worry about it, everyday you have 3 or 4 messages with agent in Linkedin right?
I am very very surprised, because :
I work ...
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316
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Spawning child processes from root using runuser command
I am working as an intern for an online coding platform startup (similar to LeetCode or HackerRank).
The backend is written in Nodejs. Instead of running the code in a sandbox of some sort, the lead ...
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Does snapd enforce cryptographic authentication and integrity validation by default for all packages? (debian, ubuntu)
Does the snapd package manager in Debian-based systems require successful cryptographic authentication and integrity validation for all packages?
I know that software downloaded with apt-get packages ...
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Does apt-get enforce cryptographic authentication and integrity validation by default for all packages? (debian, ubuntu)
Does the built-in apt package manager in Debian-based systems require successful cryptographic authentication and integrity validation for all packages?
My understanding was that software downloaded ...
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- Exploit aborted due to failure: not-found: Can't find base64 decode on target
So. I am having some issues at metasploit.
I am trying to exploit
exploit/multi/http/wp_crop_rce.
I am using Docker, in order to install wordpress version: 4.8.9.
PHP 7.2.12 (cli) (built: Nov 28 2018 ...
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Possible to inject in the middle of a ROOT NOPASSWD command with a wild card?
I'm testing for privilege escalations on a Ubuntu 18.04 host, and after running sudo -l , I've discovered a couple of root NOPASSWD commands for a standard user (w/unknown password). These commands ...
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Is there a way to close 22 SSH port from public, ubuntu?
I am using putty and private key to access my development server. I used Nmap to see which ports are visible to the public, and in fact the 22 is open.
Is it possible to hide open port from the public?...
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Security implications of automatic signing of kernel modules on Debian/Ubuntu (like VirtualBox does)
In the past, to install VirtualBox on Debian/Ubuntu you needed to sign some kernel modules, otherwise it would not work. The process involved creating a key pair, importing the public key as a MOK (...
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112
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Intercept HTTP requests for invalid domains in Linux
I am using Ubuntu 18.04. When making a HTTP request to invalid domains, I get a HTML page with javascript code that redirects me to uniregistry a landing page.
More specifically, when trying to load ...
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2
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691
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Was there ever any malware found in Debian/Ubuntu packages?
With over 30,000 projects packaged by Debian, it doesn't seem too unlikely that some of them may contain malware. On Ubuntu's side, the review process is apparently rather superficial, aimed at ...
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Maximum password length for user accounts on Ubuntu
I have a VPS hosted at a remote location. Obviously the host can login directly (without SSH or any keys) on this box and I want to make brute force password guessing as hard as possible for a bad ...
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I found an unknown UFW rule on my ubuntu server - have I been compromised?
The server is running the Kubuntu Desktop variant of Ubuntu (I transformed it into a server, I had things configured that would have been a pain to transfer to another installation.).
One day I ...
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Trojan detected in windows 10 can it affect dual boot Ubuntu
My windows defender detected this trojan: win32/credentialaccess!rfn and I tried to remove it.
I use dual boot with Ubuntu:
can this also effect ubuntu?
If i reset my windows completely can it come ...
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227
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Step by step protocol for complete system wipe (suspecting persistent backdoor)
I have reason to believe that there is a persistent backdoor on my device, one which is not removed after a re installation of the OS.
I wanted to know the step by step protocol of system wipe to ...
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Check TRIM space on SSD
Is it possible to 'view' the space that TRIM would take care of to see if that space was really wiped? I am using both Windows and Linux.
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Investigating HP sure start triggering security warnings
The following question belongs more to the HP forums but unfortunately I am not gaining any traction there. Please move the question to another SE if its off topic for this community.
Recently I've ...
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WordPress script injections [duplicate]
I manage an Ubuntu server that runs a number of WordPress sites. This morning one of them went down and was showing the exception
PHP Fatal error: Namespace declaration statement has to be the very ...
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Unusal GET requests in my nodejs journal - has my nginx/node been hacked? [duplicate]
Saw this in the journalctl for a service I have:
jul 29 12:39:05 ubuntu-18 node[796]: GET http://www.123cha.com/ 200 147.463 ms - 8485
jul 29 12:39:10 ubuntu-18 node[796]: GET http://www.rfa.org/...
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Laravel | Why create a public_html folder and link/move it?
I am using laravel on shared hosting.
Under my domain in my folder is the laravel app.
Now I see online that many people do weird stuff with the laravel public folder, they either move it to a ...
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4
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How safe is dm-crypt/LUKS? Would TPM make me more secure in this case?
I’ve been looking to purchase a new laptop and I need to have security in mind. I’ve specifically been looking for laptops with discrete or integrated TPM because it’s been my understanding that TPM ...
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