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(Red Hat Issues Fix) Dnsmasq Multiple Flaws Let Remote Users Execute Arbitrary Code, Deny Service, and Obtain Potentially Sensitive Information
SecurityTracker Alert ID: 1039478|
SecurityTracker URL: http://securitytracker.com/id/1039478
(Links to External Site)
Date: Oct 2 2017
Denial of service via network, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, User access via network|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): prior to 2.78|
Multiple vulnerabilities were reported in Dnsmasq. A remote user can execute arbitrary code on the target system. A remote user can cause the target service to crash. A remote user can obtain potentially sensitive information on the target system.|
A remote user can send specially crafted DNS packets to trigger a heap overflow and execute arbitrary code on the target system [CVE-2017-14491].
A remote user on the local network can send specially crafted IPv6 router advertisement (RA) messages to trigger a heap overflow and execute arbitrary code on the target system [CVE-2017-14492]. Systems using the enable-ra, ra-only, slaac,
ra-names, ra-advrouter, or ra-stateless configuration options are affected.
A remote user on the local network can send a specially crafted DHCPv6 request to trigger a stack overflow and execute arbitrary code on the target system [CVE-2017-14493].
A remote user on the local network can send specially crafted DHCPv6 packets to trigger a flaw in the DHCPv6 relay code and obtain potentially sensitive information from process memory on the target system [CVE-2017-14494].
A remote user can send specially crafted DNS packets to cause the add_pseudoheader() function to allocate memory that is never freed, consuming excessive memory on the target system [CVE-2017-14495].
A remote user can send specially crafted DNS packets to trigger an integer underflow and subsequent buffer over-read error in the EDNS0 code and cause the target service to crash [CVE-2017-14496]. Systems using the add-mac, add-cpe-id, or add-subnet configuration options are affected.
A remote user can send a specially crafted DNS query to cause the target service to crash, due to a regression error in a security fix in version 2.77 [CVE-2017-13704].
Felix Wilhelm, Fermin J. Serna, Gabriel Campana, Kevin Hamacher, and Ron Bowes of the Google Security Team and Christian Kujau, Arne Woerner, Juan Manuel Fernandez, and Kevin Darbyshire-Bryant reported these vulnerabilities.
A remote user can execute arbitrary code on the target system.|
A remote user can cause the target service to crash.
A remote user on the local network can obtain potentially sensitive information from process memory on the target system.
Red Hat has issued a fix for CVE-2017-14491.|
The Red Hat advisory is available at:
Vendor URL: access.redhat.com/errata/RHSA-2017:2841 (Links to External Site)
Access control error, Boundary error, Resource error|
|Underlying OS: Linux (Red Hat Enterprise)|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Subject: [RHSA-2017:2841-01] Critical: dnsmasq security update|
-----BEGIN PGP SIGNED MESSAGE-----
Red Hat Security Advisory
Synopsis: Critical: dnsmasq security update
Advisory ID: RHSA-2017:2841-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:2841
Issue date: 2017-10-02
CVE Names: CVE-2017-14491
An update for dnsmasq is now available for Red Hat Enterprise Linux 5.9
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 Long Life (v. 5.9 server) - i386, ia64, x86_64
The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name
Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.
* 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.
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 this issue.
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
5. Bugs fixed (https://bugzilla.redhat.com/):
1495409 - CVE-2017-14491 dnsmasq: heap overflow in the code responsible for building DNS replies
6. Package List:
Red Hat Enterprise Linux Long Life (v. 5.9 server):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <email@example.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2017 Red Hat, Inc.
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Version: GnuPG v1
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