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                     Turbolinux Security Announcement

        Package:  vixie-cron
        Vulnerable Packages: All Turbolinux versions previous to 3.0.1-46
        Date: 05/02/2001 5:00 PDT


        Affected Turbolinux platforms: TL Server 6.5,
                                      TL 6.1 WorkStation,
                                      All Turbolinux versions
                                      6.0.5 and earlier

        Turbolinux Advisory ID#:  TLSA2001013

        Credits: Vulnerability first discovered by
 flatline<achter05@ie.hva.nl>
     References:  http://marc.theaimsgroup.com/?l=bugtraq&m=98200814418344&w=2

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A security hole has been discovered in the package vixie-cron.  Please
update the packages in your installation as soon as possible.
____________________________________________________________________________________________
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1. Problem Summary

   There is a buffer overflow vulnerability associated with the crontab 
   function.  When crontab determines the name of the user calling the
   crontab function, it stores this name in a 20 byte buffer using the
   strcpy() function, which does no bounds checking.  The command
   "useradd" accepts more than 20 characters.  Therefore, a username
   greater than 20 characters will crash a system when passed to the 
   crontab function.

2. Impact

   It is possible for a local user to gain elevated privileges.

3. Solution
     
   Update the packages from our ftp server by running the following command:

   rpm -Uvh ftp_path_to_filename

   Where ftp_path_to_filename is the following:


ftp://ftp.turbolinux.com/pub/updates/6.0/security/vixie-cron-3.0.1-46.i386.rpm 

   The source RPM can be downloaded here:


ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/vixie-cron-3.0.1-46.src.rpm

  **Note: You must rebuild and install the RPM if you choose to download
  and install the SRPM.  Simply installing the SRPM alone WILL NOT CLOSE
  THE SECURITY HOLE.

 Please verify the MD5 checksums of the updates before you install:

  MD5 sum                               Package Name
--------------------------------------------------------------------------------------------
-
                                       
  c79c05f0044f88812908b17730a308ee	vixie-cron-3.0.1-46.i386.rpm
  cdfd064650b8839a3d7f3eb18a494165      vixie-cron-3.0.1-46.src.rpm
____________________________________________________________________________________________
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These packages are GPG signed by Turbolinux for security. Our key
is available here:

 http://www.turbolinux.com/security/tlgpgkey.asc

To verify a package, use the following command:

 rpm --checksig name_of_rpm

To examine only the md5sum, use the following command:

 md5sum name_of_rpm

**Note: Checking GPG keys requires RPM 3.0 or higher.

_______________________________________________________________________________________________
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You can find more updates on our ftp server:

   ftp://ftp.turbolinux.com/pub/updates/6.0/security/ 

for TL6.0 Workstation and Server security updates

Our webpage for security announcements:

   http://www.turbolinux.com/security

If you want to report vulnerabilities, please contact:

   security@turbolinux.com
_______________________________________________________________________________________________
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Subscribe to the Turbolinux Security Mailing lists:

  TL-security - A moderated list for discussing security issues
                Turbolinux products.
  Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security

  TL-security-announce - An announce-only mailing list for security
                         updates and alerts.

  Subscribe at:

      http://www.turbolinux.com/mailman/listinfo/tl-security-announce

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