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Category:   Application (Generic)  >   Cron Vendors:   Vixie, Paul
Cron Utility Allows Local Users to Obtain Root-Level Privileges
SecurityTracker Alert ID:  1001489
SecurityTracker URL:  http://securitytracker.com/id/1001489
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Updated:  May 8 2001
Original Entry Date:  May 8 2001
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.0pl1-57.3
Description:   A vulnerability was reported in the Vixie cron utility that allows local users to obtain root-level privileges on the host.

It is reported that a recent (fall 2000) security fix to cron introduced this vulnerability. The utility apparently does not properly release privileges before invoking the editor, allowing a local user to execute commands on the host with root-level privileges.

Impact:   A local user can execute commands on the host with root-level privileges, thereby obtaining root level access to the host.
Solution:   This has been fixed in version 3.0pl1-57.3 (or 3.0pl1-67 for unstable). See the Debian Security Advisory in the Source Message for more details.
Vendor URL:  www.debian.org/security/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any)
Underlying OS Comments:  This may only affect Debian, but that has not yet been confirmed

Message History:   This archive entry has one or more follow-up message(s) listed below.
(Exploit Code Released) Re: Cron Utility Allows Local Users to Obtain Root-Level Privileges
Exploit code was released.
(Information on Affected OS Platforms) Re: Cron Utility Allows Local Users to Obtain Root-Level Privileges
A user indicates that Debian and SuSE are affected and that other Linux platforms may also be affected.
(Mandrake Releases Fix) Re: Cron Utility Allows Local Users to Obtain Root-Level Privileges
Mandrake has releases a fix.
(SuSE Releases Fix) Re: Cron Utility Allows Local Users to Obtain Root-Level Privileges
SuSE has released a fix.
(SuSE Releases Fix) Re: Cron Utility Allows Local Users to Obtain Root-Level Privileges
SuSE has released a fixed package.
(Turbo Linux Issues Fix) Re: Cron Utility Allows Local Users to Obtain Root-Level Privileges
Turbo Linux has issued a fix.
(SCO Releases Fix) Re: Cron Utility Allows Local Users to Obtain Root-Level Privileges
SCO has released a fix.



 Source Message Contents

Subject:  [SECURITY] [DSA-054-1] cron local root exploit


-----BEGIN PGP SIGNED MESSAGE-----

- ------------------------------------------------------------------------
Debian Security Advisory DSA-054-1                   security@debian.org
http://www.debian.org/security/                         Wichert Akkerman
May  7, 2001
- ------------------------------------------------------------------------


Package        : cron
Problem type   : local root exploit
Debian-specific:  no

A recent (fall 2000) security fix to cron introduced an error in giving
up privileges before invoking the editor.  A malicious user could
easily gain root access.

This has been fixed in version 3.0pl1-57.3 (or 3.0pl1-67 for unstable).
No exploits are known to exist, but we recommend that you upgrade your
cron packages immediately.

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.


Debian GNU/Linux 2.2 alias potato
- ---------------------------------

  Potato was released for alpha, arm, i386, m68k, powerpc and sparc.

  Source archives:
    http://security.debian.org/dists/stable/updates/main/source/cron_3.0pl1-57.3.diff.gz
      MD5 checksum: beef030f2642e0e3178cc1fcddd3601f
    http://security.debian.org/dists/stable/updates/main/source/cron_3.0pl1-57.3.dsc
      MD5 checksum: 898496ede6e71287a50acabd0a9bfdc0
    http://security.debian.org/dists/stable/updates/main/source/cron_3.0pl1.orig.tar.gz
      MD5 checksum: 4c64aece846f8483daf440f8e3dd210f

  Alpha architecture:
    http://security.debian.org/dists/stable/updates/main/binary-alpha/cron_3.0pl1-57.3_alpha.deb
      MD5 checksum: b056a55f3d51d92390f6e4b7c09f8108

  ARM architecture:
    http://security.debian.org/dists/stable/updates/main/binary-arm/cron_3.0pl1-57.3_arm.deb
      MD5 checksum: 0ebd5904db1e137caa53e83d085f5973

  Intel ia32 architecture:
    http://security.debian.org/dists/stable/updates/main/binary-i386/cron_3.0pl1-57.3_i386.deb
      MD5 checksum: 6a11a3427bd263429f8189054b67add7

  Motorola 680x0 architecture:
    http://security.debian.org/dists/stable/updates/main/binary-m68k/cron_3.0pl1-57.3_m68k.deb
      MD5 checksum: eb9993da9cc3c5d5188866ca453c0ab7

  PowerPC architecture:
    http://security.debian.org/dists/stable/updates/main/binary-powerpc/cron_3.0pl1-57.3_powerpc.deb
      MD5 checksum: 17d1109ce6eeb714a09f864bb244f804

  Sun Sparc architecture:
    http://security.debian.org/dists/stable/updates/main/binary-sparc/cron_3.0pl1-57.3_sparc.deb
      MD5 checksum: 9486a5eaa675ada6a5bbfaca2fa2a9ef

  These packages will be moved into the stable distribution on its next
  revision.

For not yet released architectures please refer to the appropriate
directory ftp://ftp.debian.org/debian/dists/sid/binary-$arch/ .

- -- 
- ----------------------------------------------------------------------------
apt-get: deb http://security.debian.org/ stable/updates main
dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org

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