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-   -   failed xscreensaver login when x down? (https://www.linuxquestions.org/questions/linux-security-4/failed-xscreensaver-login-when-x-down-293422/)

Chuck23 02-22-2005 10:41 AM

failed xscreensaver login when x down?
 
Noticed a couple of strange things this morning when i flipped on my monitor, and I wonder if anyone can help me sort them out.

First of all, at the runlevel 3 login prompt, instead of seeing my normal blank

hostname login:

I saw this:

hostname login: e100:eth0 NIC Link is Down
e100: eth0 NIC Link is Up (speed)
e100: eth0 NIC Link is Down
e100: eth0 NIC Link is Up (speed)

The link went down overnight as I slept (no time given in any log that I could find) and for some reason the information just output to the login prompt? Weird, but not terribly worrisome... yet.

So I ran rkhunter. Everything looked fine until this:

Checking loaded kernel mods Warning! (found difference in output)

I did add a module recently, so that probably explains that.

But then I checked my security log and saw the strangest thing ever:

xscreensaver FAILED LOGIN

at 2:32, when I was sound asleep and the machine was running at rl 3...

Anybody have any idea what the xscreensaver login attempt is all about?

Chuck23 02-23-2005 08:12 AM

Nobody has any idea about this xscreensaver failed login? Now I'm getting a little worried.

Capt_Caveman 02-23-2005 09:01 AM

Unless someone was able to establish a remote X session, then the failed xscreensaver login had to be local. Check the output of last -i for login times that occurred overnight. What does the rkhunter logfile show as the module discrepency?

Chuck23 02-23-2005 08:32 PM

last -i doesn't show any unusual activity. rkhunter didn't give specific info about the mod, just that something had changed, and it probably had to do with some tinkering with mysql. When I ran rkhunter again today, it didn't show anything wrong. Pretty sure I inserted a new mod since last time I ran rkhunter. Not worried about it.

I don't think anybody could establish a remote xsession unless they could figure out a way to do it through... well, let's not give them any ideas. ;)

But as long as we're on the subject of security. This morning at 4:17, I got an email from winvn@news.ksc.nasa.gov

Subject: Hello,info,japanese girl VS playboy

Message: Content-Type: application/octet-stream;
name=jill stack@fastclick[1].txt
Content-Transfer-Encoding: base64Content-ID: <ZwF6s9780575W39tY94>cGx1dG8KNzM2MzgzMzI4fDB8ZTE0YTI5MmEtM
Tg5NC00YTUzLWE2ZmEtOTliM2IyMjk1YmM3fApmYXN0Y2xpY2submV0Lw
oxMDI0CjM4OTcwNzIzODQKMjk4Mzg5MjEKNDA3NDg2NTgwOAoyOTcxMT
k3NwoqCj==

What the hell is that all about?

Capt_Caveman 02-23-2005 09:47 PM

I don't think anybody could establish a remote xsession unless they could figure out a way to do it through... well, let's not give them any ideas.
It's possible (but not likely) that someone could establish a remote desktop session by connecting to your local X server, but you should see a remote login. Plus if you are normally in runlevel three, then someone would first have to remotely log into the box using some other method, then fire up X and then establish the remote desktop session (all of which is pretty unlikely). What's odd is that a failed xscreensaver login should only be possible in a desktop session, but from everything you've described it doesn't seem possible. Might want to add an iptables rule logging any incoming or outgoing X traffic.

What the hell is that all about?
Given that all I get in my inbox anymore is pr0n spam or a virus, I'd say it's one of those (Actually it's klez).


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