Log Review- SU


 
Thread Tools Search this Thread
Special Forums Cybersecurity Log Review- SU
# 1  
Old 09-17-2015
Log Review- SU

Hi,

Can some please provide some hints on what to look for in unix/Linux logs such as sulog from a Information security perspective.

Regards
# 2  
Old 09-17-2015
Repetitive failed tries could be a hint for some unusual behaviour.

Else you might go look up this log when something bad has happened already to get a clue afterwards who might have been it.

If this is not enough and you are looking for some more information, which commands have been issued by whom etc., you might want to have a look at an auditing suite.
Maybe auditd is available for your Linux distribution.
# 3  
Old 09-22-2015
Our policy is that every use of su or sudo has to be explained. Just collecting the records and challenging is a good start, however I added something in to /etc/profile that tries to log all the commands too. There are certainly some flaws with it and it depends on people doing su - or su - username to run the profile and therefore be effective, but that has always been the habit here, so I got away with that.

There were various other application specific things embedded in the code but having stripped that out, I think this might still work:-
Code:
function lgcmd
{
 cur_cmd_seq=`fc -l -0 | cut -f1`
 if [ "$cur_cmd_seq" != "$prev_cmd_seq" ]
 then
    prev_cmd_seq="$cur_cmd_seq"
    /usr/bin/logger "on $PTS as `id -un`: `fc -l -0 | cut -f2-`"
 fi
}

prev_cmd_seq=                  # Set as null in case shell refuses unset variables
trap lgcmd DEBUG

You would need to determine the pseudo-terminal as $PTS but the rest gives you a fairly good trace to challenge people with.


I hope that this helps,
Robin
Login or Register to Ask a Question

Previous Thread | Next Thread

5 More Discussions You Might Find Interesting

1. IP Networking

Netsat output-Please review

Hello, Please review the output below and suggest if you notice the parameters going out of limit. netstat -p udp udp: 382735172 datagrams received 0 incomplete headers 0 bad data length fields 0 bad checksums 12519 dropped due to no socket ... (2 Replies)
Discussion started by: Vishal_dba
2 Replies

2. Post Here to Contact Site Administrators and Moderators

Please review this thread wrt o/p

https://www.unix.com/unix-dummies-questions-answers/117633-top-output-specific-process-file-2.html (2 Replies)
Discussion started by: methyl
2 Replies

3. Solaris

please review this cron syntax

Dears if i want to run this job every Saturday at 6 AM that will be the code * 6 * * 1 cd /export/home/jenova ; ls -ltr >> $HOME/jenova_dir (2 Replies)
Discussion started by: jenovaux
2 Replies

4. Shell Programming and Scripting

Please, review script.

Hi guys, I 've been brewing this shellscript, but I can't test it until next tuesday. In the meantime I am too curious wether it will work or not, so I'd like to hear your comments. Background: I want to watch the user quota for mailboxes in various email-domains on a IMAP-server. I have... (1 Reply)
Discussion started by: algernonz
1 Replies

5. UNIX for Dummies Questions & Answers

Where can I review the source code?

A very n00b question: After compiling and installing software, where does the original source code reside? I'd like to study the source code of some of the ports I've installed. Thanks! :D (1 Reply)
Discussion started by: Aaron Van
1 Replies
Login or Register to Ask a Question