RE: ARCserve 6.61 Share Access Vulnerability

From: David Sexton (dave.sextonat_private)
Date: Mon Sep 17 2001 - 03:31:43 PDT

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    I've just had a look at our ArcServe 2000 install and the files are there.
    This install is an upgrade from 6.6, so Ican't be certain if the problem
    exists on a fresh install.
    
    We were able to change the permissions of the share & files so that only the
    administrators & backup accounts have access to them. So far, everything
    seems fine (several test backups worked) - however, I'll have to wait until
    tonight to see if this has affected the scheduled backups (hope not!)
    
    Cheers,
    
    Dave
    
    > -----Original Message-----
    > From:	ron [SMTP:rdrat_private]
    > Sent:	16 September 2001 05:27
    > To:	bugtraqat_private
    > Subject:	ARCserve 6.61 Share Access Vulnerability
    > 
    > I have found a vulnerability with ARCServe for NT 6.61 SP2a. I stumbled
    > upon this while performing a vulnerability analysis. 
    > 
    > Details:
    > 
    > The default install of ARCServe for NT creates a hidden share on Windows
    > NT machines when it is installed.
    > 
    > The name of this share is ARCSERVE$.
    > 
    > The permissions of the share allow all users in a domain to map this
    > share. However, this is not the worst part.
    > 
    > Within the share is a file named aremote.dmp.  The full path is
    > ARCSERVE$\DR\<NAME of SERVER>\aremote.dmp.
    > 
    > In the aremote.dmp file, the account name that runs the backup is in
    > cleartext within this file.  Also, a little further
    > within the file, the password for the account is in cleartext.
    > 
    > Seeing as how the account that performs backups can access system files,
    > this is very dangerous.  Some places run their
    > backups as the NT domain administrator account.
    > 
    > Fix:
    > 
    > CA has been notified and will be making a patch available to all
    > customers.
    > 
    > 
    > Also, it _should_ be possible to change the share permissions, allowing
    > only the backup account and the administrator access to the share.
    > 
    > 
    > I am not sure if this is in ARCServe 2000 or in releases prior, as I have
    > not checked them.
    > 
    > - rdr
    
    
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