Originally Published: Tuesday, 2 May 2000 Author: Alexander Reelsen
Published to: news_enhance_security/Security News Page: 1/1 - [Std View]

Suse Security Announcement - aaa_base

Suse released a security announcement concerning aaa_base, what allowed any local user to remove files.

Date: Sat, 29 Apr 2000 16:28:06 +0200 (MEST) From: marc@suse.de (Marc Heuse) Subject: [suse-security] SuSE Security Announcement - aaa_base

SuSE Security Announcement

Package: aaabase < 2000.1.3 Date: Sat, 29 Apr 2000 14:03:28 GMT

Affected SuSE versions: all Vulnerability Type: remove any local file(s) executing attacker supplied commands as non-root SuSE default package: yes Other affected systems: unknown ______________________________________________________________________________

A security hole was discovered in the package mentioned above. Please update as soon as possible or disable the service if you are using this software on your SuSE Linux installation(s).

Other Linux distributions or operating systems might be affected as well, please contact your vendor for information about this issue.

Please note that we provide this information on an "as-is" basis only. There is no warranty whatsoever and no liability for any direct, indirect or incidental damage arising from this information or the installation of the update package. _____________________________________________________________________________

1. Problem Description

aaa_base is the basic package which comes with any SuSE Linux installation. Two vulnerabilities have been found:

1) The cron job /etc/cron.daily/aaa_base does a daily checking of files in /tmp and /var/tmp, where old files will be deleted if configured to do so. Please note this this feature is NOT activated by default

2) Some system accounts have their homedirectories set to /tmp by default. These are the users games, firewall, wwwrun and nobody on a SuSE 6.4.

2. Impact

1) If the /tmp cleanup is activated, any file or directory can be deleted by any local user

2) If an attacker creates dot files in /tmp (e.g. bash profiles), these might be executed if someone uses e.g. "su - nobody" to switch to the nobody user. This can lead to a compromise of that userid. This vulnerability is present in several other unix systems as well - please check all!

3. Solution

1) Update the package from our FTP server.

2) The root user will receive a email with the accounts listed which have a homedirectory in /tmp. You have to fix this by hand, because some installations might break if they rely on information saved in the (unsafe) /tmp homedirectory. The email will give more information what to do. ______________________________________________________________________________

Please verify these md5 checksums of the updates before installing:

369c48687807875e9b01f24b6e6bb061 ftp://ftp.suse.com/pub/suse/axp/update/6.3/a1/aaa_base-2000.1.3-0.alpha.rpm 350cabc140a177dfa1909d356c982647 ftp://ftp.suse.com/pub/suse/i386/update/6.2/a1/aaa_base-99.9.8-0.i386.rpm 1b0ccf6db229d6c45692588d826853b7 ftp://ftp.suse.com/pub/suse/i386/update/6.3/a1/aaa_base-2000.1.3-0.i386.rpm 34ff11f9ffd877231fab6add4a1723dd ftp://ftp.suse.com/pub/suse/i386/update/6.4/a1/aaa_base-2000.4.27-1.i386.rpm ______________________________________________________________________________

You can find updates on our ftp-Server:

ftp://ftp.suse.com/pub/suse/i386/update for Intel processors ftp://ftp.suse.com/pub/suse/axp/update for Alpha processors

or try the following web pages for a list of mirrors: http://www.suse.de/ftp.html http://www.suse.com/ftp_new.html

Our webpage for patches: http://www.suse.de/patches/index.html

Our webpage for security announcements: http://www.suse.de/security

If you want to report vulnerabilities, please contact security@suse.de