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Stay Ahead With Linux Security HOWTOs

7.Locks HexConnections Esm H350
How to Secure My NetworkPrice Tag 1access control Linux administration

Most SSH hardening advice ends at the same recommendation: Disable password authentication and use SSH keys. . That's good advice. It removes entire classes of attacks, including password spraying, credential stuffing, and brute-force attempts against exposed servers. The problem is what happens next. Many administrators treat SSH keys as the finish line when they are really the beginning of the hardening process. Attackers rarely care whether they obtained access with a password or a private...
1 min read How to Secure My Network
Detect Unauthorised Ssh Keys Hero Esm H350
How to Secure My NetworkPrice Tag 1security advisory remote access

Most of the time, nobody notices. SSH authentication succeeds, no alerts are generated, and the connection looks exactly the way it did the day the key was installed. That's part of the problem. . When security teams investigate unauthorized access on Linux systems, they often focus on passwords, exposed services, or vulnerable software. Trusted access receives less attention. Yet a single forgotten or unauthorized SSH key can provide the same access as a legitimate user while attracting very...
4 - 7 min read How to Secure My Network
IDS VS IPS Esm H350
How to Secure My NetworkPrice Tag 1intrusion detection application security

The wrong IPS rule can look like a security fix right up until it becomes an outage. . On Linux systems, detection and prevention are often discussed together, but they do not carry the same operational risk. One tells admins that something suspicious happened. The other can decide whether traffic is allowed to continue. That is why IDS vs IPS is not just a definition to memorize. It is a deployment decision about where to monitor, where to block, and how much confidence a team needs before...
4 - 8 min read How to Secure My Network
8.Locks HexConnections CodeGlobe Esm H350
How to Secure My NetworkPrice Tag 1unauthorized access security techniques

Exposed SSH servers are continuously hammered by brute-force attacks, password spraying, credential stuffing, and recycled passwords from infostealer dumps. Attackers rotate usernames, test weak credentials, and probe for anything that gives them initial access. The logs usually look messy long before the compromise happens. . The difficult part is separating harmless failures from actual intrusion activity. One failed login from an internal workstation rarely matters. Repeated failures...
5 - 9 min read How to Secure My Network
7.Locks HexConnections Esm H350
How to Secure My NetworkPrice Tag 1security advisory incident response

The first 30 minutes after discovering a compromised Linux server usually decide how much evidence remains available. One rushed reboot or cleanup attempt can wipe logs, terminate malicious processes, or remove network activity that investigators still need to review. Attackers also do not usually stay on one system for long once access is established. Early response is mostly about preserving visibility. Collect process information. Save network connections. Limit access carefully before...
6 - 11 min read How to Secure My Network
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Explore Latest Linux Security HOWTOs

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166
General Esm H240
Price Tag 1data protectionsecurity practicesaccess control

Improving Data Protection through File Permissions in Linux Systems

Linux/Unix allows users to protect their data from access by other users.. Introduction File permissions are usually confusing to newer Linux users. Most 'newbies' are not accustom to implementing file security because of thier DOS/Windows background. Why do we need file security? It is primarly needed to ensure data protection and privacy from other system users. In other cases, file security is needed to prevent 'normal users' (as opposed to system administrators) from changing configurations or accidently damaging a system. File permissions allow users to share selected data and programs with other users by the means of a simple but effective protection scheme. Q. How do you know what permissions are granted for a particular file? A. Use the command: ls -l The first 10 characters displayed are the file type and access permissions: -rwxrwxr-x or drwxrwxr-x. The first character is either - or d. A dash indicates that it is a file and a indicates that it is a directory. The next 3 characters show the owner's permissions. The following 3 indicate the permissions for users in the file's group. The last 3 characters show the permissions for all other users. The possibilities for permissions include: r - read w - write x - execute - - no permission Q. How do I change permissions for a particular file that I own? A. Use the 'chmod' utility. Syntax: chmod who [operation] [permission] file(s) Who: ------------- u - user/owner g - group o - other users a - all users Operation: ------------- + add permission - remove permission Permission: ------------- r - read w - write x - execute File(s): ------------ List 1 or more filenames. Examples of using ' chmod ' to change permissions: % chmod a+r /home/usr/abd01/data This gives everyone on the system permission to read 'data' % chmod og=, u+rwx /home/usr/abd01/protect This takes away rwx permission from group members and all other userson the system. It also adds rwx permissions for the file owner. Note : chmod can also be used with an octal absolute system. This method is described in another tip. ( i.e. chmod 755 filename ).. Introduction File permissions are usually confusing to newer Linux users. Most 'newbies' are not acc. users, linux/unix, allows, protect, their, other, introduction, permissi. . Anthony Pell

Calendar 2 Jul 12, 2000 •User Avatar Anthony Pell How to Learn Tips and Tricks
News Add Esm H240

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[{"id":483,"title":"Self-taught through trial and error","votes":548,"type":"x","order":1,"pct":78.51,"resources":[]},{"id":484,"title":"Formal training or courses","votes":30,"type":"x","order":2,"pct":4.3,"resources":[]},{"id":485,"title":"A job that required it","votes":34,"type":"x","order":3,"pct":4.87,"resources":[]},{"id":486,"title":"Other","votes":86,"type":"x","order":4,"pct":12.32,"resources":[]}] ["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"] ["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"] 350
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