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On Sun, 16 Jul 2006 15:54:18 -0400, Dave S <gentoo@××××××××.net> wrote: |
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> On Sunday 16 July 2006 19:54, Hemmann, Volker Armin wrote: |
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>> On Sunday 16 July 2006 20:25, Dave S wrote: |
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>> > HI, I have a potential security problem ... |
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>> > |
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>> > and err its not on gentoo, its on ubuntu but I am not getting any |
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>> > response there & you guys are the most tech bunch I know - Thought I |
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>> > would lay it on the table :) |
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>> > |
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>> > I just had an email from chkrootkit last night - |
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>> > |
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>> > --- |
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>> > |
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>> > The following suspicious files and directories were found: |
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>> > |
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>> > You have 3 process hidden for readdir command |
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>> > You have 3 process hidden for ps command |
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>> > chkproc: Warning: Possible LKM Trojan installed |
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>> > |
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>> > --- |
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>> > |
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>> > Running chkrootkit now and all is OK |
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>> > |
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>> > root@dave-comp:~# |
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>> > root@dave-comp:~# chkrootkit | grep chkproc |
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>> > Checking `lkm'... chkproc: nothing detected |
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>> > root@dave-comp:~# |
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>> > |
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>> > I have even 'sudo install --reinstall chkrootkit' in case its binarys |
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>> > have been modified (paranoid) |
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>> |
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>> if you installed using the tools of the system, it could be worthless, |
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>> because compromised. Boot from a cd and check from the cd. |
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> |
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> I understand. Booted from knoppix 5.0.1, executed a |
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> |
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> 'chroot /mnt/hda1 chkrootkit' and a |
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> 'chroot /mnt/hda1 rkhunter -c' |
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> |
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> - both scans brought back nothing. From what I have read the chkrootkit & |
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> rkhunter binarys would have been from the CD and therefore untainted ? |
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> Am I |
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> correct ? |
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> |
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> Are there any other checks I can do - re-installing the system is not my |
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> preferred option :) |
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> |
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> Dave |
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I'm a newbie, so discount this appropriately. |
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1. IIUC, running rkhunter/chkrootkit from knoppix simply checks the |
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knoppix cd. |
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2. You want second/third opinions. IIWU, |
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i. I'd scan the box with a Trojan signature scanner - e.g. fprotect, |
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AntiVir, etc. |
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from Knoppix - first assuring that you have current signatures. |
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ii. I'd reemerge/recompile the kernel WITHOUT modules or module |
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support, and clear out your usr/lib/modules (though IIUC, this |
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can be foiled). |
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iii. I'd try zeppoo. |
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3. Try to figure out how you got it. e.g. you installed software from an |
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unreliable source; your privileges are screwed up; you have an unpatched |
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server(s) running; etc. |
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Maybe.... you could find the both the vector and the lkm - but |
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understanding that the only real solution to a |
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rootkit is restoring from a clean backup, or rebuilding :-( |
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-- |
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