bugtraq - Re: SuSEs YaST Online Update - possible symlink attack

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Message-ID: <Pine.LNX.4.58.0404061503380.28035@qrag.fhfr.qr>
Date: Wed, 7 Apr 2004 03:07:59 +0200 (MEST)
From: Roman Drahtmueller <draht@...e.de>
To: bugtraq@...urityfocus.com, Rene <l0om@...luded.org>
Cc: security@...e.com
Subject: Re: SuSEs YaST Online Update - possible symlink attack

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>  
> possible symlink attack in SuSEs YOU [YaST Online 
> Update] 
>  in SuSE linux you can use YOU to auto update your system.  you can do
> this by YaST or by hand with the command "online_update".  as a normal
> user you can check for updates with the options "-q" or "-k".  By doing
> this "online_update" will do the follwing:  creats a directory in
> /usr/tmp/you-$USER in this direcoty it will creat the files "cookies",
> "quickcheack" and "youservers" (furthermore it creats some directorys-
> nevermind...).  it doesnt check for a allready existing directory called
> "you-$USER" or for files like "cookies"  which may be there.
>  

The problem is present in SUSE Linux 8.2 and 9.0. SUSE Linux releases
before 8.2 are not affected. 
Update packages for YOU will be released within the following days. They
fix the vulnerability by using the user's home directory for storing the
information about possibly pending updates. It should be noted that YOU
(Yast Online Update) needs (of course) to be run as root to be able to not
only check for updates, but to be able to actually install them.

> bye and have a lot of phun 
> 	l0om 

As usual, we appreciate notices about security vulnerabilities at 
security@...e.com, in particular because of lagged mailing lists.
Encryption keys, detailed contact information, statements, announcements,
useful links and other information can be found on the SUSE Security main
website at http://www.suse.de/security/.

Thanks,
Roman Drahtmüller,
SUSE Security.
- -- 
 -                                                                      -
| Roman Drahtmüller      <draht@...e.de> // "You don't need eyes to see, |
  SUSE Linux AG - Security       Phone: //             you need vision!"
| Nürnberg, Germany     +49-911-740530 //           Maxi Jazz, Faithless |
 -                                                                      -
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