Synopsis

Critical: dnsmasq security update

Type/Severity

Security Advisory: Critical

Topic

An update for dnsmasq is now available for Red Hat Enterprise Linux 6.2 Advanced Update Support, Red Hat Enterprise Linux 6.4 Advanced Update Support, Red Hat Enterprise Linux 6.5 Advanced Update Support, Red Hat Enterprise Linux 6.5 Telco Extended Update Support, Red Hat Enterprise Linux 6.6 Advanced Update Support, Red Hat Enterprise Linux 6.6 Telco Extended Update Support, and Red Hat Enterprise Linux 6.7 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.

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 - Extended Update Support 6.7 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support 6.7 i386
• Red Hat Enterprise Linux EUS Compute Node 6.7 x86_64
• Red Hat Enterprise Linux Server - AUS 6.6 x86_64
• Red Hat Enterprise Linux Server - AUS 6.5 x86_64
• Red Hat Enterprise Linux Server - AUS 6.4 x86_64
• Red Hat Enterprise Linux Server - AUS 6.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.7 s390x
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.7 ppc64
• Red Hat Enterprise Linux Server - TUS 6.6 x86_64
• Red Hat Enterprise Linux Server - TUS 6.5 x86_64

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 - Extended Update Support 6.7

SRPM
dnsmasq-2.48-16.el6_7.1.src.rpm	SHA-256: 8786aca29703efade9cded49613451a5c78ff8c9cdd53a22a35d17b79a22f1f4
x86_64
dnsmasq-2.48-16.el6_7.1.x86_64.rpm	SHA-256: bbf50d3330c249e0a7f87e3c9f1938e3f384c85d40e41f873d4e59ebafc4da61
dnsmasq-debuginfo-2.48-16.el6_7.1.x86_64.rpm	SHA-256: 1da21c29600595ac009b92ce3b5b5ca9da70ed1d65b9ee095cce00428c765abf
dnsmasq-debuginfo-2.48-16.el6_7.1.x86_64.rpm	SHA-256: 1da21c29600595ac009b92ce3b5b5ca9da70ed1d65b9ee095cce00428c765abf
dnsmasq-utils-2.48-16.el6_7.1.x86_64.rpm	SHA-256: fcb91a4de948b37970310cc06c1de8a62484daaf4d1631487b42e7f3fcf7b05d
i386
dnsmasq-2.48-16.el6_7.1.i686.rpm	SHA-256: c2da33fd27d7dea5dfc9775e3c6f536ff48d7576e94624bb0047f97de6ce002b
dnsmasq-debuginfo-2.48-16.el6_7.1.i686.rpm	SHA-256: ecf6a045f9c23b9867a059b7edc22ef1ee6e08574b8b1a6723d800705bbdb3f7
dnsmasq-debuginfo-2.48-16.el6_7.1.i686.rpm	SHA-256: ecf6a045f9c23b9867a059b7edc22ef1ee6e08574b8b1a6723d800705bbdb3f7
dnsmasq-utils-2.48-16.el6_7.1.i686.rpm	SHA-256: 5d668284cbf4a768b5ad1284e5724fde46f5f66951c2cbceb787c8d6c8bf70a2

Red Hat Enterprise Linux Server - AUS 6.6

SRPM
dnsmasq-2.48-14.el6_6.1.src.rpm	SHA-256: 4227d5712d9c853c5889449afa9792921ef8508c8c9b8957da18721da6e97f48
x86_64
dnsmasq-2.48-14.el6_6.1.x86_64.rpm	SHA-256: eee8fb6c0a8d6319cb8c03f06aedadc55a0f9a52f13733c1a9cf28918b75d3d4
dnsmasq-debuginfo-2.48-14.el6_6.1.x86_64.rpm	SHA-256: 9d3987d723e014f0dbc91caac8558dc1efc4abdfd86dd18bbd76bf9583190a7c
dnsmasq-debuginfo-2.48-14.el6_6.1.x86_64.rpm	SHA-256: 9d3987d723e014f0dbc91caac8558dc1efc4abdfd86dd18bbd76bf9583190a7c
dnsmasq-utils-2.48-14.el6_6.1.x86_64.rpm	SHA-256: 6b7465c877d42346a0716b91ae29d2af7788cda12d8f5cbb3f291012e68b4d59

Red Hat Enterprise Linux Server - AUS 6.5

SRPM
dnsmasq-2.48-13.el6_5.1.src.rpm	SHA-256: 7c7f61d0c827616d7b539faa2c2136664c973fedcc51acb714a2beda6c73969c
x86_64
dnsmasq-2.48-13.el6_5.1.x86_64.rpm	SHA-256: b4b87e3d576aa5c44d1c2d45edfb188f3266c7ced2c7b2aa49e3a3bcdd9cd69f
dnsmasq-debuginfo-2.48-13.el6_5.1.x86_64.rpm	SHA-256: 6a7f5df9c9aea0b7d2d20d94bf6c328d42dd3bb6f3fbb012ef45b06a76d884fe
dnsmasq-debuginfo-2.48-13.el6_5.1.x86_64.rpm	SHA-256: 6a7f5df9c9aea0b7d2d20d94bf6c328d42dd3bb6f3fbb012ef45b06a76d884fe
dnsmasq-utils-2.48-13.el6_5.1.x86_64.rpm	SHA-256: 298afe1a300398750b8503e350a7430b5fc0770f73236745fe772ab24f78fccb

Red Hat Enterprise Linux Server - AUS 6.4

SRPM
dnsmasq-2.48-13.el6_4.1.src.rpm	SHA-256: f70339c5769bac5ce7e3bbf03351e807976b13daeb322062e9fa1d518fa39ddf
x86_64
dnsmasq-2.48-13.el6_4.1.x86_64.rpm	SHA-256: 25824d72bf4484fa3438aae494321da7f8e27880198e3e57cd8013fc9f096e61
dnsmasq-debuginfo-2.48-13.el6_4.1.x86_64.rpm	SHA-256: 3c4b07730f008f661f35c1264886eda5a4ffc3b39e56d3290b54614bbe43accb
dnsmasq-debuginfo-2.48-13.el6_4.1.x86_64.rpm	SHA-256: 3c4b07730f008f661f35c1264886eda5a4ffc3b39e56d3290b54614bbe43accb
dnsmasq-utils-2.48-13.el6_4.1.x86_64.rpm	SHA-256: 3ba537f20c9abc72455e397734952800adc4d5a4f6853b7eff206a787f69b1a4

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.7

SRPM
dnsmasq-2.48-16.el6_7.1.src.rpm	SHA-256: 8786aca29703efade9cded49613451a5c78ff8c9cdd53a22a35d17b79a22f1f4
s390x
dnsmasq-2.48-16.el6_7.1.s390x.rpm	SHA-256: 906d5dd4e142dc69319e5202a25158b0ce90db34a27dc34e5558605e50aaf043
dnsmasq-debuginfo-2.48-16.el6_7.1.s390x.rpm	SHA-256: 2c2ac8b4024b57e6d1c3142dbb6e05fc71a148e11032ef4a774685b39789a418
dnsmasq-debuginfo-2.48-16.el6_7.1.s390x.rpm	SHA-256: 2c2ac8b4024b57e6d1c3142dbb6e05fc71a148e11032ef4a774685b39789a418
dnsmasq-utils-2.48-16.el6_7.1.s390x.rpm	SHA-256: e3e5d5948d9f8234d3cccdcdc61641de29a7d9879e7569becd48c798df14c762

Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.7

SRPM
dnsmasq-2.48-16.el6_7.1.src.rpm	SHA-256: 8786aca29703efade9cded49613451a5c78ff8c9cdd53a22a35d17b79a22f1f4
ppc64
dnsmasq-2.48-16.el6_7.1.ppc64.rpm	SHA-256: b6673d6d3d2db246437f7a84568ed37a89c36becfe98c59d4f6d9351a191931d
dnsmasq-debuginfo-2.48-16.el6_7.1.ppc64.rpm	SHA-256: 8b6f23c5b17673c17537b698d7059fecac2bc750f29d8e01b6010535930cc49f
dnsmasq-debuginfo-2.48-16.el6_7.1.ppc64.rpm	SHA-256: 8b6f23c5b17673c17537b698d7059fecac2bc750f29d8e01b6010535930cc49f
dnsmasq-utils-2.48-16.el6_7.1.ppc64.rpm	SHA-256: 99c6f8eae95c510138672a0be8451ea7ea3293c3fe51ae2c5d04ad7ab1aeba43

Red Hat Enterprise Linux EUS Compute Node 6.7

SRPM
dnsmasq-2.48-16.el6_7.1.src.rpm	SHA-256: 8786aca29703efade9cded49613451a5c78ff8c9cdd53a22a35d17b79a22f1f4
x86_64
dnsmasq-2.48-16.el6_7.1.x86_64.rpm	SHA-256: bbf50d3330c249e0a7f87e3c9f1938e3f384c85d40e41f873d4e59ebafc4da61
dnsmasq-debuginfo-2.48-16.el6_7.1.x86_64.rpm	SHA-256: 1da21c29600595ac009b92ce3b5b5ca9da70ed1d65b9ee095cce00428c765abf
dnsmasq-debuginfo-2.48-16.el6_7.1.x86_64.rpm	SHA-256: 1da21c29600595ac009b92ce3b5b5ca9da70ed1d65b9ee095cce00428c765abf
dnsmasq-utils-2.48-16.el6_7.1.x86_64.rpm	SHA-256: fcb91a4de948b37970310cc06c1de8a62484daaf4d1631487b42e7f3fcf7b05d

Red Hat Enterprise Linux Server - AUS 6.2

SRPM
dnsmasq-2.48-5.el6_2.2.src.rpm	SHA-256: 3ce77ea8f07bfdc22b2fd5a2c3bfa1dee0ba9b924e34bf3274ce00be8a855de3
x86_64
dnsmasq-2.48-5.el6_2.2.x86_64.rpm	SHA-256: 1b0ac3716b6517491fc0055d484718ed55e24640039f61c8117f8055794376e1
dnsmasq-debuginfo-2.48-5.el6_2.2.x86_64.rpm	SHA-256: 442b05f24a370d6a359ba32eda2fa318c58666b2ea829c3cb8238ce4231b266b

Red Hat Enterprise Linux Server - TUS 6.6

SRPM
dnsmasq-2.48-14.el6_6.1.src.rpm	SHA-256: 4227d5712d9c853c5889449afa9792921ef8508c8c9b8957da18721da6e97f48
x86_64
dnsmasq-2.48-14.el6_6.1.x86_64.rpm	SHA-256: eee8fb6c0a8d6319cb8c03f06aedadc55a0f9a52f13733c1a9cf28918b75d3d4
dnsmasq-debuginfo-2.48-14.el6_6.1.x86_64.rpm	SHA-256: 9d3987d723e014f0dbc91caac8558dc1efc4abdfd86dd18bbd76bf9583190a7c
dnsmasq-debuginfo-2.48-14.el6_6.1.x86_64.rpm	SHA-256: 9d3987d723e014f0dbc91caac8558dc1efc4abdfd86dd18bbd76bf9583190a7c
dnsmasq-utils-2.48-14.el6_6.1.x86_64.rpm	SHA-256: 6b7465c877d42346a0716b91ae29d2af7788cda12d8f5cbb3f291012e68b4d59

Red Hat Enterprise Linux Server - TUS 6.5

SRPM
dnsmasq-2.48-13.el6_5.1.src.rpm	SHA-256: 7c7f61d0c827616d7b539faa2c2136664c973fedcc51acb714a2beda6c73969c
x86_64
dnsmasq-2.48-13.el6_5.1.x86_64.rpm	SHA-256: b4b87e3d576aa5c44d1c2d45edfb188f3266c7ced2c7b2aa49e3a3bcdd9cd69f
dnsmasq-debuginfo-2.48-13.el6_5.1.x86_64.rpm	SHA-256: 6a7f5df9c9aea0b7d2d20d94bf6c328d42dd3bb6f3fbb012ef45b06a76d884fe
dnsmasq-debuginfo-2.48-13.el6_5.1.x86_64.rpm	SHA-256: 6a7f5df9c9aea0b7d2d20d94bf6c328d42dd3bb6f3fbb012ef45b06a76d884fe
dnsmasq-utils-2.48-13.el6_5.1.x86_64.rpm	SHA-256: 298afe1a300398750b8503e350a7430b5fc0770f73236745fe772ab24f78fccb