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TUCoPS :: Linux :: Apps N-Z :: esa2-001.txt

sudo can invoke the system MTA as root - ESA-20020114-001





+------------------------------------------------------------------------+
| EnGarde Secure Linux Security Advisory                January 14, 2002 |
|  http://www.engardelinux.org/ ESA-20020114-001 |
|                                                                        |
| Package:  sudo                                                         |
| Summary:  sudo can invoke the system MTA as root.                      |
+------------------------------------------------------------------------+

  EnGarde Secure Linux is a secure distribution of Linux that features
  improved access control, host and network intrusion detection, Web
  based secure remote management, complete e-commerce using AllCommerce,
  and integrated open source security tools.


OVERVIEW
--------
  There is a vulnerability in sudo which can allow an attacker to trick
  sudo into running the system MTA with root privileges and an unclean
  environment, possibly leading to a root compromise.


DETAIL
------
  Sebastian Krahmer of the SuSE Security Team found a bug in sudo which
  can allow an attacker to send a failed-invocation email with root
  privileges and an unclean environment.  Using the Postfix MTA an
  attacker can potentially gain a root shell.  No other MTA is known to be
  exploitable at this time.

  We would like to reiterate that the bug is in sudo, not Postfix which is
  simply being used as a vehicle in this instance.

  This bug is fixed by having sudo run the MTA with user privileges
  instead of with root privileges.


SOLUTION
--------
  This information applies only to EnGarde Secure Linux Community edition
  users. Registered users of the EnGarde Secure Linux Professional
  edition can use the Guardian Digital Secure Network to upgrade their
  packages automatically.

  All users should upgrade to the most recent version as outlined in
  this advisory.  All updates may be found at:

     ftp://ftp.engardelinux.org/pub/engarde/stable/updates/
http://ftp.engardelinux.org/pub/engarde/stable/updates/

Before upgrading the package, the machine must either:

    a) be booted into a "standard" kernel; or
    b) have LIDS disabled.

  To disable LIDS, execute the command:

    # /sbin/lidsadm -S -- -LIDS_GLOBAL

  To install the updated package, execute the command:

    # rpm -Uvh 

You must now update the LIDS configuration by executing the command:

    # /usr/sbin/config_lids.pl

  To re-enable LIDS (if it was disabled), execute the command:

    # /sbin/lidsadm -S -- +LIDS_GLOBAL

  To verify the signatures of the updated packages, execute the command:

    # rpm -Kv 


UPDATED PACKAGES
----------------
  These updated packages are for EnGarde Secure Linux 1.0.1 (Finestra).

  Source Packages:

    SRPMS/sudo-1.6.4-1.0.6.src.rpm
      MD5 Sum: bf14204686a62f01b429eb28d83cfd6b

  Binary Packages:

    i386/sudo-1.6.4-1.0.6.i386.rpm
      MD5 Sum: 83fceade44a6d263647653351c2acade

    i686/sudo-1.6.4-1.0.6.i686.rpm
      MD5 Sum: 8b8c9344cbc950cd9fd4f2fc1c3136f8


REFERENCES
----------

  Guardian Digital's public key:
     http://ftp.engardelinux.org/pub/engarde/ENGARDE-GPG-KEY

Credit for the discovery of this bug goes to:
    Sebastian Krahmer <krahmer@suse.de>

sudo's Official Web Site:
     http://www.sudo.ws/sudo/

Security Contact:    security@guardiandigital.com
EnGarde Advisories:   http://www.engardelinux.org/advisories.html

--------------------------------------------------------------------------
$Id: ESA-20020114-001-sudo,v 1.1 2002/01/14 17:36:06 rwm Exp $
--------------------------------------------------------------------------
Author: Ryan W. Maple, <ryan@guardiandigital.com>
Copyright 2002, Guardian Digital, Inc.


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