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Category:   Application (Generic)  >   coreutils Vendors:   GNU [multiple authors]
coreutils Red Hat PAM Configuration Bug May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1020552
SecurityTracker URL:  http://securitytracker.com/id/1020552
CVE Reference:   CVE-2008-1946   (Links to External Site)
Date:  Jul 25 2008
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in coreutils on Red Hat. A local user can obtain elevated privileges on the target system.

The coreutils package on Red Hat Enterprise Linux does not use the Pluggable Authentication Module (PAM) pam_succeed_if() function properly in the configuration file for the "su" command.

A local user with knowledge of the target user's password can exploit the command to change to a locked or expired target user account.

Impact:   A local user with knowledge of the target user's password can execute commands as the locked or expired target user account.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2008-0780.html

Cause:   Configuration error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  4

Message History:   None.


 Source Message Contents

Subject:  [RHSA-2008:0780-01] Low: coreutils security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Low: coreutils security update
Advisory ID:       RHSA-2008:0780-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2008-0780.html
Issue date:        2008-07-24
CVE Names:         CVE-2008-1946 
=====================================================================

1. Summary:

Updated coreutils packages that fix a security issue are now available for
Red Hat Enterprise Linux 4.

This update has been rated as having low security impact by the Red Hat
Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

3. Description:

The coreutils package contains the core GNU utilities. It is the
combination of the old GNU fileutils, sh-utils, and textutils packages.

The coreutils packages were found to not use the pam_succeed_if Pluggable
Authentication Module (PAM) correctly in the configuration file for the
"su" command. Any local user could use this command to change to a locked
or expired user account if the target account's password was known to the
user running "su". These updated packages, correctly, only allow the root
user to switch to locked or expired accounts using "su". (CVE-2008-1946)

All users of coreutils are advised to upgrade to this updated package,
which resolve this issue.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network.  Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

5. Bugs fixed (http://bugzilla.redhat.com/):

446488 - CVE-2008-1946 /etc/pam.d/su is wrong in RHEL-4.6

6. Package List:

Red Hat Enterprise Linux AS version 4:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/coreutils-5.2.1-31.8.el4.src.rpm

i386:
coreutils-5.2.1-31.8.el4.i386.rpm
coreutils-debuginfo-5.2.1-31.8.el4.i386.rpm

ia64:
coreutils-5.2.1-31.8.el4.ia64.rpm
coreutils-debuginfo-5.2.1-31.8.el4.ia64.rpm

ppc:
coreutils-5.2.1-31.8.el4.ppc.rpm
coreutils-debuginfo-5.2.1-31.8.el4.ppc.rpm

s390:
coreutils-5.2.1-31.8.el4.s390.rpm
coreutils-debuginfo-5.2.1-31.8.el4.s390.rpm

s390x:
coreutils-5.2.1-31.8.el4.s390x.rpm
coreutils-debuginfo-5.2.1-31.8.el4.s390x.rpm

x86_64:
coreutils-5.2.1-31.8.el4.x86_64.rpm
coreutils-debuginfo-5.2.1-31.8.el4.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/coreutils-5.2.1-31.8.el4.src.rpm

i386:
coreutils-5.2.1-31.8.el4.i386.rpm
coreutils-debuginfo-5.2.1-31.8.el4.i386.rpm

x86_64:
coreutils-5.2.1-31.8.el4.x86_64.rpm
coreutils-debuginfo-5.2.1-31.8.el4.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/coreutils-5.2.1-31.8.el4.src.rpm

i386:
coreutils-5.2.1-31.8.el4.i386.rpm
coreutils-debuginfo-5.2.1-31.8.el4.i386.rpm

ia64:
coreutils-5.2.1-31.8.el4.ia64.rpm
coreutils-debuginfo-5.2.1-31.8.el4.ia64.rpm

x86_64:
coreutils-5.2.1-31.8.el4.x86_64.rpm
coreutils-debuginfo-5.2.1-31.8.el4.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/coreutils-5.2.1-31.8.el4.src.rpm

i386:
coreutils-5.2.1-31.8.el4.i386.rpm
coreutils-debuginfo-5.2.1-31.8.el4.i386.rpm

ia64:
coreutils-5.2.1-31.8.el4.ia64.rpm
coreutils-debuginfo-5.2.1-31.8.el4.ia64.rpm

x86_64:
coreutils-5.2.1-31.8.el4.x86_64.rpm
coreutils-debuginfo-5.2.1-31.8.el4.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1946
http://www.redhat.com/security/updates/classification/#low

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2008 Red Hat, Inc.
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