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

Synopsis:          Critical: dnsmasq security update
Advisory ID:       RHSA-2017:2837-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2837
Issue date:        2017-10-02
CVE Names:         CVE-2017-14491 CVE-2017-14492 CVE-2017-14493 
                   CVE-2017-14494 
=====================================================================

1. Summary:

An update for dnsmasq is now available for Red Hat Enterprise Linux 7.2
Extended Update Support and Red Hat Enterprise Linux 7.3 Extended Update
Support.

Red Hat Product Security has rated this update as having a security impact
of Critical. 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 ComputeNode EUS (v. 7.2) - x86_64
Red Hat Enterprise Linux ComputeNode EUS (v. 7.3) - x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2) - x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3) - x86_64
Red Hat Enterprise Linux Server EUS (v. 7.2) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server EUS (v. 7.3) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.2) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.3) - ppc64, ppc64le, s390x, x86_64

3. Description:

The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name
Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.

Security Fix(es):

* A heap buffer overflow was found in dnsmasq in the code responsible for
building DNS replies. An attacker could send crafted DNS packets to dnsmasq
which would cause it to crash or, potentially, execute arbitrary code.
(CVE-2017-14491)

* A heap buffer overflow was discovered in dnsmasq in the IPv6 router
advertisement (RA) handling code. An attacker on the local network segment
could send crafted RAs to dnsmasq which would cause it to crash or,
potentially, execute arbitrary code. This issue only affected
configurations using one of these options: enable-ra, ra-only, slaac,
ra-names, ra-advrouter, or ra-stateless. (CVE-2017-14492)

* A stack buffer overflow was found in dnsmasq in the DHCPv6 code. An
attacker on the local network could send a crafted DHCPv6 request to
dnsmasq which would cause it to a crash or, potentially, execute arbitrary
code. (CVE-2017-14493)

* An information leak was found in dnsmasq in the DHCPv6 relay code. An
attacker on the local network could send crafted DHCPv6 packets to dnsmasq
causing it to forward the contents of process memory, potentially leaking
sensitive data. (CVE-2017-14494)

Red Hat would like to thank Felix Wilhelm (Google Security Team), Fermin J.
Serna (Google Security Team), Gabriel Campana (Google Security Team), Kevin
Hamacher (Google Security Team), and Ron Bowes (Google Security Team) for
reporting 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/):

1495409 - CVE-2017-14491 dnsmasq: heap overflow in the code responsible for building DNS replies
1495410 - CVE-2017-14492 dnsmasq: heap overflow in the IPv6 router advertisement code
1495411 - CVE-2017-14493 dnsmasq: stack buffer overflow in the DHCPv6 code
1495412 - CVE-2017-14494 dnsmasq: information leak in the DHCPv6 relay code

6. Package List:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.2):

Source:
dnsmasq-2.66-14.el7_2.2.src.rpm

x86_64:
dnsmasq-2.66-14.el7_2.2.x86_64.rpm
dnsmasq-debuginfo-2.66-14.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode EUS (v. 7.3):

Source:
dnsmasq-2.66-21.el7_3.2.src.rpm

x86_64:
dnsmasq-2.66-21.el7_3.2.x86_64.rpm
dnsmasq-debuginfo-2.66-21.el7_3.2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2):

x86_64:
dnsmasq-debuginfo-2.66-14.el7_2.2.x86_64.rpm
dnsmasq-utils-2.66-14.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3):

x86_64:
dnsmasq-debuginfo-2.66-21.el7_3.2.x86_64.rpm
dnsmasq-utils-2.66-21.el7_3.2.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.2):

Source:
dnsmasq-2.66-14.el7_2.2.src.rpm

ppc64:
dnsmasq-2.66-14.el7_2.2.ppc64.rpm
dnsmasq-debuginfo-2.66-14.el7_2.2.ppc64.rpm

ppc64le:
dnsmasq-2.66-14.el7_2.2.ppc64le.rpm
dnsmasq-debuginfo-2.66-14.el7_2.2.ppc64le.rpm

s390x:
dnsmasq-2.66-14.el7_2.2.s390x.rpm
dnsmasq-debuginfo-2.66-14.el7_2.2.s390x.rpm

x86_64:
dnsmasq-2.66-14.el7_2.2.x86_64.rpm
dnsmasq-debuginfo-2.66-14.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.3):

Source:
dnsmasq-2.66-21.el7_3.2.src.rpm

ppc64:
dnsmasq-2.66-21.el7_3.2.ppc64.rpm
dnsmasq-debuginfo-2.66-21.el7_3.2.ppc64.rpm

ppc64le:
dnsmasq-2.66-21.el7_3.2.ppc64le.rpm
dnsmasq-debuginfo-2.66-21.el7_3.2.ppc64le.rpm

s390x:
dnsmasq-2.66-21.el7_3.2.s390x.rpm
dnsmasq-debuginfo-2.66-21.el7_3.2.s390x.rpm

x86_64:
dnsmasq-2.66-21.el7_3.2.x86_64.rpm
dnsmasq-debuginfo-2.66-21.el7_3.2.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.2):

ppc64:
dnsmasq-debuginfo-2.66-14.el7_2.2.ppc64.rpm
dnsmasq-utils-2.66-14.el7_2.2.ppc64.rpm

ppc64le:
dnsmasq-debuginfo-2.66-14.el7_2.2.ppc64le.rpm
dnsmasq-utils-2.66-14.el7_2.2.ppc64le.rpm

s390x:
dnsmasq-debuginfo-2.66-14.el7_2.2.s390x.rpm
dnsmasq-utils-2.66-14.el7_2.2.s390x.rpm

x86_64:
dnsmasq-debuginfo-2.66-14.el7_2.2.x86_64.rpm
dnsmasq-utils-2.66-14.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.3):

ppc64:
dnsmasq-debuginfo-2.66-21.el7_3.2.ppc64.rpm
dnsmasq-utils-2.66-21.el7_3.2.ppc64.rpm

ppc64le:
dnsmasq-debuginfo-2.66-21.el7_3.2.ppc64le.rpm
dnsmasq-utils-2.66-21.el7_3.2.ppc64le.rpm

s390x:
dnsmasq-debuginfo-2.66-21.el7_3.2.s390x.rpm
dnsmasq-utils-2.66-21.el7_3.2.s390x.rpm

x86_64:
dnsmasq-debuginfo-2.66-21.el7_3.2.x86_64.rpm
dnsmasq-utils-2.66-21.el7_3.2.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-2017-14491
https://access.redhat.com/security/cve/CVE-2017-14492
https://access.redhat.com/security/cve/CVE-2017-14493
https://access.redhat.com/security/cve/CVE-2017-14494
https://access.redhat.com/security/updates/classification/#critical
https://access.redhat.com/security/vulnerabilities/3199382

8. Contact:

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

Copyright 2017 Red Hat, Inc.
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