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Category:   Application (Generic)  >   Dhcp Vendors:   ISC (Internet Software Consortium)
(Red Hat Issues Fix) Dhcp Reference Counter Overflow Lets Remote Users Cause the Target dhcpd Service to Crash
SecurityTracker Alert ID:  1040477
SecurityTracker URL:  http://securitytracker.com/id/1040477
CVE Reference:   CVE-2018-5733   (Links to External Site)
Date:  Mar 10 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0
Description:   A vulnerability was reported in Dhcp. A remote user can cause the target service to crash.

A remote user can send large amounts of data to the target server can send a large number of packets (e.g., billions of packets) to trigger a reference counter overflow and cause the target dhcpd service to consume all available memory and crash.

Felix Wilhelm, Google Security Team, reported this vulnerability.

Impact:   A remote user can cause the target service to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:0469

Vendor URL:  access.redhat.com/errata/RHSA-2018:0469 (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Feb 28 2018 Dhcp Reference Counter Overflow Lets Remote Users Cause the Target dhcpd Service to Crash



 Source Message Contents

Subject:  [RHSA-2018:0469-01] Important: dhcp security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: dhcp security update
Advisory ID:       RHSA-2018:0469-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:0469
Issue date:        2018-03-09
CVE Names:         CVE-2018-5732 CVE-2018-5733 
=====================================================================

1. Summary:

An update for dhcp is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, 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 dhcp packages provide a relay agent and ISC DHCP service
required to enable and administer DHCP on a network.

Security Fix(es):

* dhcp: Buffer overflow in dhclient possibly allowing code execution
triggered by malicious server (CVE-2018-5732)

* dhcp: Reference count overflow in dhcpd allows denial of service
(CVE-2018-5733)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank ISC for reporting these issues. Upstream
acknowledges Felix Wilhelm (Google) as the original reporter of these
issues.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

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

1549960 - CVE-2018-5732 dhcp: Buffer overflow in dhclient possibly allowing code execution triggered by malicious server
1549961 - CVE-2018-5733 dhcp: Reference count overflow in dhcpd allows denial of service

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
dhcp-4.1.1-53.P1.el6_9.3.src.rpm

i386:
dhclient-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-common-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.i686.rpm

x86_64:
dhclient-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-common-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
dhcp-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.i686.rpm

x86_64:
dhcp-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
dhcp-4.1.1-53.P1.el6_9.3.src.rpm

x86_64:
dhclient-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-common-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

x86_64:
dhcp-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
dhcp-4.1.1-53.P1.el6_9.3.src.rpm

i386:
dhclient-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-common-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.i686.rpm

ppc64:
dhclient-4.1.1-53.P1.el6_9.3.ppc64.rpm
dhcp-4.1.1-53.P1.el6_9.3.ppc64.rpm
dhcp-common-4.1.1-53.P1.el6_9.3.ppc64.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.ppc64.rpm

s390x:
dhclient-4.1.1-53.P1.el6_9.3.s390x.rpm
dhcp-4.1.1-53.P1.el6_9.3.s390x.rpm
dhcp-common-4.1.1-53.P1.el6_9.3.s390x.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.s390x.rpm

x86_64:
dhclient-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-common-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.i686.rpm

ppc64:
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.ppc.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.ppc64.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.ppc.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.ppc64.rpm

s390x:
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.s390.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.s390x.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.s390.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.s390x.rpm

x86_64:
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
dhcp-4.1.1-53.P1.el6_9.3.src.rpm

i386:
dhclient-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-common-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.i686.rpm

x86_64:
dhclient-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-common-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.i686.rpm

x86_64:
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-debuginfo-4.1.1-53.P1.el6_9.3.x86_64.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.i686.rpm
dhcp-devel-4.1.1-53.P1.el6_9.3.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://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2018-5732
https://access.redhat.com/security/cve/CVE-2018-5733
https://access.redhat.com/security/updates/classification/#important
https://kb.isc.org/article/AA-01565
https://kb.isc.org/article/AA-01567

8. Contact:

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

Copyright 2018 Red Hat, Inc.
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