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security

change /proc/PID/environ after process start

August 11, 2022 by Magenaut

$ k=v p & [1] 3028 is there any way for p to change the contents of /proc/3028/environ to not mention k=v while p is still running? Answers: Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them … Read more

Categories Q&A, Unix & Linux Tags environment-variables, linux, linux-kernel, process, security Leave a comment

Is there a way to get security updates for wheezy after EOL

August 10, 2022 by Magenaut

I know the best solution would be to upgrade the server after Debian wheezy has reached End Of LIfe in May 2018, but is there a way to continue running an old wheezy instance and get some minimal updates still?

Categories Q&A, Unix & Linux Tags backports, debian, security Leave a comment

Securely feeding a program with a password

August 10, 2022 by Magenaut

After understanding the problem with using a password in the command line, I need to find a way of feeding a program with a password without it being a problem (without the password being recorded somewhere).

Categories Q&A, Unix & Linux Tags bash-script, password, security Leave a comment

Erasing a Linux laptop

August 10, 2022 by Magenaut

I have a laptop with Debian on it, and I am going to sell this laptop.

Categories Q&A, Unix & Linux Tags data-destruction, linux, security Leave a comment

SSH key-based authentication: known_hosts vs authorized_keys

August 10, 2022 by Magenaut

I read about setting up ssh keys in Linux and have some questions. Correct me if I’m wrong…

Categories Q&A, Unix & Linux Tags key-authentication, openssh, security, ssh Leave a comment

Root access that can’t change root password?

August 10, 2022 by Magenaut

We are having a little problem on a server. We want that some users should be able to do e.g. sudo and become root, but with the restriction that the user can’t change root password. That is, a guarantee that we still can login to that server and become root no matter of what the other users will do.

Categories Q&A, Unix & Linux Tags security, sudo, ubuntu Leave a comment

Block Particular Command in Linux for Specific user

August 10, 2022 by Magenaut

How to block command, let say mkdir for specific user ?

Categories Q&A, Unix & Linux Tags account-restrictions, linux, restricted-shell, security Leave a comment

Why is “nodev” in /etc/fstab so important? How can character devices be used for hacking?

August 10, 2022 by Magenaut

I am learning about linux security and struggling to understand why a USB stick with a character device on it is potentially dangerous.

Categories Q&A, Unix & Linux Tags devices, fstab, mount, security Leave a comment

How to identify a process which has no pid?

August 10, 2022 by Magenaut

I have a process which listen to 2 ports : 45136/tcp and 37208/udp (actually I assume it is the same process). But netstat doesn’t return any pid :

Categories Q&A, Unix & Linux Tags networking, process, security Leave a comment

File permission execute only

August 10, 2022 by Magenaut

How can I set file to be executable only to other users but not readable/writable, the reason for this I’m executing something with my username but I don’t want to give out the password. I tried :

Categories Q&A, Unix & Linux Tags executable, linux, permissions, security Leave a comment
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  1. michealSmith07 on Is there a way to dynamically refresh the less command?August 21, 2022

    That is a very nice post. I like this post.

  2. anonymous on Fix libwacom9 dependency issue when upgrade DebianJune 27, 2022

    saved my day!! Thanks for the help…

  3. sreedhar on Fix libwacom9 dependency issue when upgrade DebianMay 10, 2022

    Thanks its working

  4. saintnick on Fix libwacom9 dependency issue when upgrade DebianMay 10, 2022

    remove libwacom2 worked for me as well

  5. ranafoul on Fix libwacom9 dependency issue when upgrade DebianApril 22, 2022

    apt remove libwacom2 helped on kali 2022.01. gr8

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