Synopsis

Critical: dnsmasq security update

Type/Severity

Security Advisory: Critical

Topic

An update for dnsmasq is now available for Red Hat Enterprise Linux 5.9 Long Life.

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.

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)
  

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.

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

Affected Products

• Red Hat Enterprise Linux Server - AUS 5.9 x86_64
• Red Hat Enterprise Linux Server - AUS 5.9 ia64
• Red Hat Enterprise Linux Server - AUS 5.9 i386

Fixes

• BZ - 1495409 - CVE-2017-14491 dnsmasq: heap overflow in the code responsible for building DNS replies

CVEs

• CVE-2017-14491

References

• https://access.redhat.com/security/updates/classification/#critical
• https://access.redhat.com/security/vulnerabilities/3199382

Red Hat Enterprise Linux Server - AUS 5.9

SRPM
dnsmasq-2.45-2.el5_9.1.src.rpm	SHA-256: ad5e9be82c52eb8b5a2c0ff0ec04945b74e6bf27e7d252c17e305b65f6fdd2ca
x86_64
dnsmasq-2.45-2.el5_9.1.x86_64.rpm	SHA-256: 8293fcec37b4704690c85b0d492dfb013f64261b596e7cb6fe95fa1899cd33b3
dnsmasq-debuginfo-2.45-2.el5_9.1.x86_64.rpm	SHA-256: 0a3d66cd50cdda35f0e860f6aa7676cad2b2c36577afbf6a4c1ccf219ad91832
ia64
dnsmasq-2.45-2.el5_9.1.ia64.rpm	SHA-256: c5febfae8123cb235ca5f5e008b895da781a2567e9a4c449fff0b5287bdbbb75
dnsmasq-debuginfo-2.45-2.el5_9.1.ia64.rpm	SHA-256: 33d568a1f3e6c684ea14924e13d85f1279211f4664fa04c8234f8fb8ebc14a69
i386
dnsmasq-2.45-2.el5_9.1.i386.rpm	SHA-256: 3524da732834a640380f3edfd1f143352cc60b7c57e7b769a592ee114b274c93
dnsmasq-debuginfo-2.45-2.el5_9.1.i386.rpm	SHA-256: aebad7d5fb2423881856426f87a3ced6c31dc625479f151bcda1b00ebd9f14e4