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Category:   Application (Generic)  >   Dhcp Vendors:   ISC (Internet Software Consortium)
(Red Hat Issues Fix) DHCP dhclient Stack Overflow in script_write_params() Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1022556
SecurityTracker URL:  http://securitytracker.com/id/1022556
CVE Reference:   CVE-2009-0692   (Links to External Site)
Date:  Jul 14 2009
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to versions 3.1.2p1, 4.0.1p1, 4.1.0p1
Description:   A vulnerability was reported in the DHCP dhclient. A remote server can execute arbitrary code on the target system.

A remote server can return a specially crafted leased address and subnet-mask value to the connected dhclient to trigger a stack overflow in the script_write_params() function and execute arbitrary code on the target system. The code will run with root privileges.

Mandriva Linux Engineering Team reported this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system with root privileges.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2009-1154.html

Vendor URL:  www.isc.org/node/468 (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  3

Message History:   This archive entry is a follow-up to the message listed below.
Jul 14 2009 DHCP dhclient Stack Overflow in script_write_params() Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2009:1154-02] Critical: dhcp security update


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

Synopsis:          Critical: dhcp security update
Advisory ID:       RHSA-2009:1154-02
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-1154.html
Issue date:        2009-07-14
CVE Names:         CVE-2009-0692 CVE-2009-1893 
=====================================================================

1. Summary:

Updated dhcp packages that fix two security issues are now available for
Red Hat Enterprise Linux 3.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64

3. Description:

The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows
individual devices on an IP network to get their own network configuration
information, including an IP address, a subnet mask, and a broadcast
address.

The Mandriva Linux Engineering Team discovered a stack-based buffer
overflow flaw in the ISC DHCP client. If the DHCP client were to receive a
malicious DHCP response, it could crash or execute arbitrary code with the
permissions of the client (root). (CVE-2009-0692)

An insecure temporary file use flaw was discovered in the DHCP daemon's
init script ("/etc/init.d/dhcpd"). A local attacker could use this flaw to
overwrite an arbitrary file with the output of the "dhcpd -t" command via
a symbolic link attack, if a system administrator executed the DHCP init
script with the "configtest", "restart", or "reload" option.
(CVE-2009-1893)

Users of DHCP should upgrade to these updated packages, which contain
backported patches to correct these issues.

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/docs/DOC-11259

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

507717 - CVE-2009-0692 dhclient: stack overflow leads to arbitrary code execution as root
510024 - CVE-2009-1893 dhcp: insecure temporary file use in the dhcpd init script

6. Package List:

Red Hat Enterprise Linux AS version 3:

Source:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/dhcp-3.0.1-10.2_EL3.src.rpm

i386:
dhclient-3.0.1-10.2_EL3.i386.rpm
dhcp-3.0.1-10.2_EL3.i386.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.i386.rpm
dhcp-devel-3.0.1-10.2_EL3.i386.rpm

ia64:
dhclient-3.0.1-10.2_EL3.ia64.rpm
dhcp-3.0.1-10.2_EL3.ia64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.ia64.rpm
dhcp-devel-3.0.1-10.2_EL3.ia64.rpm

ppc:
dhclient-3.0.1-10.2_EL3.ppc.rpm
dhcp-3.0.1-10.2_EL3.ppc.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.ppc.rpm
dhcp-devel-3.0.1-10.2_EL3.ppc.rpm

s390:
dhclient-3.0.1-10.2_EL3.s390.rpm
dhcp-3.0.1-10.2_EL3.s390.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.s390.rpm
dhcp-devel-3.0.1-10.2_EL3.s390.rpm

s390x:
dhclient-3.0.1-10.2_EL3.s390x.rpm
dhcp-3.0.1-10.2_EL3.s390x.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.s390x.rpm
dhcp-devel-3.0.1-10.2_EL3.s390x.rpm

x86_64:
dhclient-3.0.1-10.2_EL3.x86_64.rpm
dhcp-3.0.1-10.2_EL3.x86_64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.x86_64.rpm
dhcp-devel-3.0.1-10.2_EL3.x86_64.rpm

Red Hat Desktop version 3:

Source:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/dhcp-3.0.1-10.2_EL3.src.rpm

i386:
dhclient-3.0.1-10.2_EL3.i386.rpm
dhcp-3.0.1-10.2_EL3.i386.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.i386.rpm
dhcp-devel-3.0.1-10.2_EL3.i386.rpm

x86_64:
dhclient-3.0.1-10.2_EL3.x86_64.rpm
dhcp-3.0.1-10.2_EL3.x86_64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.x86_64.rpm
dhcp-devel-3.0.1-10.2_EL3.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

Source:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/dhcp-3.0.1-10.2_EL3.src.rpm

i386:
dhclient-3.0.1-10.2_EL3.i386.rpm
dhcp-3.0.1-10.2_EL3.i386.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.i386.rpm
dhcp-devel-3.0.1-10.2_EL3.i386.rpm

ia64:
dhclient-3.0.1-10.2_EL3.ia64.rpm
dhcp-3.0.1-10.2_EL3.ia64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.ia64.rpm
dhcp-devel-3.0.1-10.2_EL3.ia64.rpm

x86_64:
dhclient-3.0.1-10.2_EL3.x86_64.rpm
dhcp-3.0.1-10.2_EL3.x86_64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.x86_64.rpm
dhcp-devel-3.0.1-10.2_EL3.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

Source:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/dhcp-3.0.1-10.2_EL3.src.rpm

i386:
dhclient-3.0.1-10.2_EL3.i386.rpm
dhcp-3.0.1-10.2_EL3.i386.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.i386.rpm
dhcp-devel-3.0.1-10.2_EL3.i386.rpm

ia64:
dhclient-3.0.1-10.2_EL3.ia64.rpm
dhcp-3.0.1-10.2_EL3.ia64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.ia64.rpm
dhcp-devel-3.0.1-10.2_EL3.ia64.rpm

x86_64:
dhclient-3.0.1-10.2_EL3.x86_64.rpm
dhcp-3.0.1-10.2_EL3.x86_64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.x86_64.rpm
dhcp-devel-3.0.1-10.2_EL3.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-2009-0692
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1893
http://www.redhat.com/security/updates/classification/#critical

8. Contact:

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

Copyright 2009 Red Hat, Inc.
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