On Tue, 2012-02-14 at 08:27 -0500, Angus McIntyre wrote:

>  Checking with
> 
>     prelink --verify --sha /bin/bash
> 
> reports that
> 
>     at least one of file's dependencies has changed since prelinking
> 
> My question is: is there a way to find out which dependency has been
> changed?
>
Not that I know of. Whatever library calls '/bin/bash' makes one or more
have changed, and you would need to determine which file (library)
contained the functions/subroutines being called.

> 
> My secondary question is: does that particular combination of changed
> files sound familiar to anyone?
>
Yup.

> Is it a case of "Yeah, that'll happen, don't worry about it", or
> "Ohmigod! It's the 5udd3nD34th rootkit! Run screaming for the hills!"?
> 
Yup, it happens. I tend to do 'grep prelink /var/log/rkhunter.log', and
if there are only a few files mentioned then just manually prelink them:

   prelink /bin/bash /bin/cash /bin/more...

then run 'rkhunter --propupd'. If there has been an update to
'glibc' (typically) then you may find loads of files reporting prelink
problems. In that case 'prelink -qa' usually handles it (again run
'rkhunter --propupd' afterwards).



John.

-- 
John Horne                   Tel: +44 (0)1752 587287
Plymouth University, UK      Fax: +44 (0)1752 587001

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