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Forum: Security

Post here for help with Linux security issues: antivirus, firewalls, encryption, vulnerabilities, etc

  1. Sticky Thread Sticky: A short guide to Linux security

    Here at we are often asked about the potential threat of a virus or malware attack. This short guide is designed to answer some of...

    Started by fingal, 02-25-2006
    • Replies: 1
    • Views: 73,029
    01-11-2010 Go to last post
  1. How to block multiple ports in iptables, ipset?

    Hello, on CentOS 6, iptables 1.4.7 i can use rule to block IPs in my IPSet from accessing one port, example SSH: -A INPUT -p tcp --dport 22...

    Started by postcd, 01-15-2018
    • Replies: 8
    • Views: 1,231
    4 Weeks Ago Go to last post
  2. ssh: starting different application instead of bash - secure?

    Hi, not sure if that's the right category here. I have the following setup: We are using a text based application (written in C), which...

    Started by tjareson, 09-29-2014
    • Replies: 5
    • Views: 2,229
    12-13-2017 Go to last post
  3. Server Flooded. With what? At What?

    The IP hit us with 2TB of data in under 5 minutes. To stop the flood, we have been forced to null route the server. was...

    Started by Rob-0, 12-01-2017
    • Replies: 0
    • Views: 1,092
    12-01-2017 Go to last post
  4. selinux and iptables

    Hello, i would like to have more idea about my setup i have this server for apache (had wordpress) and another, for mysql. i set them up...

    Started by fles, 11-26-2017
    • Replies: 0
    • Views: 542
    11-26-2017 Go to last post
  5. SELinux access to file

    Hello everyone, I recently started to work with SELinux and its permissions and have encountered a problem. I want to open and write the...

    Started by Patrick-IT, 11-22-2017
    • Replies: 0
    • Views: 416
    11-22-2017 Go to last post
  6. File system granularity levels

    Is there a way to give permission levels go beyond READ. WRITE and EXECUTE. for example, if i want to restrict copy certain files to usb drives, it...

    Started by djpexhibit, 05-16-2017
    • Replies: 9
    • Views: 3,185
    11-15-2017 Go to last post
  7. How do you verify signatures?

    For context, I need to verify Qubes-OS. Link: I've been using Linux for 2 years now but I...

    Started by Alire, 11-01-2017
    • Replies: 1
    • Views: 656
    11-01-2017 Go to last post
  8. Unauthorized USB uploads...whats the name of the program?

    I just did a fresh install of Fedora 26 on my laptop. I had previously installed an app that prevents unauthorized persons from sticking a...

    Started by Raafi, 07-21-2017
    • Replies: 1
    • Views: 582
    10-25-2017 Go to last post
  9. Intercept executed command and validate

    I need to know is it possible to intercept user executed command in loadable kernel module. I know that system calls can be intercepted such as...

    Started by djpexhibit, 10-23-2017
    • Replies: 2
    • Views: 425
    10-24-2017 Go to last post
  10. Got Centos. Do i need LPS Linux for some tasks?

    Hi, I've got Centos installed on VMware. Sometimes i want to check a dodgy link, do some online banking or secure related operations on it...

    Started by itrelated, 10-16-2017
    • Replies: 2
    • Views: 597
    10-17-2017 Go to last post
  11. Is the Linux OS drive fully encrypted or can i do more?

    Hello, when i do "sudo lsblk" on Ubuntu 16.04.3 LTS cryptsetup 1.6.6, i see: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT...

    Started by postcd, 10-07-2017
    • Replies: 2
    • Views: 749
    10-08-2017 Go to last post
  12. iptables question, how fatal it is if it can not find IP Set?

    Hello, i am on CentOS 6, 2.6.32 kernel. and i installed "ipset" package. Now i created new ip set and populated it with IPs, i activated...

    Started by postcd, 09-29-2017
    • Replies: 0
    • Views: 553
    09-29-2017 Go to last post
  13. SELinux implementation with virtual machines

    I am working with SELinux for my final year project.My objective is to show how to prevent zero day exploits with SELinux.I am planning to use...

    Started by nengo, 10-08-2007
    • Replies: 3
    • Views: 1,414
    09-19-2017 Go to last post
  14. Firewall rules to drop all traffic on port 80 and 443 but allow wget .

    Hello all, I have a interesting situation here. My current situation is: I have a Linux server which acts as a gateway for several other Linux...

    Started by terrywhitejr2000, 09-11-2017
    • Replies: 0
    • Views: 698
    09-11-2017 Go to last post
  15. How can i redirect to other IP without "iptables -t NAT" ?

    Hello, i was curious which other method/s i can use to redirect incoming connection to different IP? Beside using "iptables -t NAT" kind of rule? ...

    Started by postcd, 07-29-2017
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,095
    08-03-2017 Go to last post
  16. Top Reasons Why Linux Server Needs 2FA

    What are the process to secure linux servers?

    Started by reve-secure, 07-09-2017
    • Replies: 2
    • Views: 2,428
    07-27-2017 Go to last post
  17. System logging vs Auditing

    Hi all. I've got Oracle Linux 7 and I need to log events related to users logons, processes start\stop and some other in order to be in compliance...

    Started by Olegg, 07-21-2017
    • Replies: 2
    • Views: 1,398
    07-24-2017 Go to last post
  18. Post How can i iptables block hostname instead of IP and on partial match?

    Hello, how can i on Linux (CentOS 6 in my case) block all incoming connections (maybe better to say deny forwarding of the network connection...

    Started by postcd, 06-25-2017
    • Replies: 3
    • Views: 3,564
    07-04-2017 Go to last post
  19. SNORT rule does not work!

    hello I have a problem. I do these steps of snort for adjusting rule. 1. cd /etc/snort/rules 2. sudo nano twitter.rules 3. reject tcp any...

    Started by pink-hat, 06-22-2017
    • Replies: 0
    • Views: 869
    06-22-2017 Go to last post
  20. [SOLVED] decryption issue

    Hi there. When i installed my os, majaro, i chose to encrypt all the partitions. at the first boot i immidiately noticed it took a very long time to...

    Started by nicocasa, 06-07-2017
    • Replies: 1
    • Views: 2,413
    06-09-2017 Go to last post

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