CVE-2017-14496

Impact:
Important
Public Date:
2017-10-02
CWE:
CWE-190->CWE-125
Bugzilla:
1495416: CVE-2017-14496 dnsmasq: integer underflow leading to buffer over-read in the EDNS0 code
An integer underflow flaw leading to a buffer over-read was found in dnsmasq in the EDNS0 code. An attacker could send crafted DNS packets to dnsmasq which would cause it to crash. This issue only affected configurations using one of the options: add-mac, add-cpe-id, or add-subnet.

Find out more about CVE-2017-14496 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

Red Hat OpenStack Platform includes the dnsmasq-utils RPM which does not contain this flaw's affected code-paths; Red Hat OpenStack Platform is therefore listed as not affected.

However, because all versions of Red Hat OpenStack Platform are based on Red Hat Enterprise Linux, all Red Hat OpenStack Platform users should absolutely upgrade the dnsmasq RPM from Red Hat Enterprise Linux as a matter of urgency using standard update mechanisms (such as 'yum update' or 'openstack overcloud update').

CVSS v2 metrics

Base Score 7.8
Base Metrics AV:N/AC:L/Au:N/C:N/I:N/A:C
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete

CVSS v3 metrics

CVSS3 Base Score 7.5
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Impact None
Availability Impact High

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (dnsmasq) RHSA-2017:2836 2017-10-02

Affected Packages State

Platform Package State
Red Hat OpenStack Platform 9.0 dnsmasq Not affected
Red Hat OpenStack Platform 8.0 (Liberty) dnsmasq Not affected
Red Hat OpenStack Platform 12 dnsmasq Not affected
Red Hat OpenStack Platform 11 dnsmasq Not affected
Red Hat OpenStack Platform 10 dnsmasq Not affected
Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 dnsmasq Not affected
Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7 dnsmasq Not affected
Red Hat Enterprise Linux 6 dnsmasq Not affected
Red Hat Enterprise Linux 5 dnsmasq Not affected

Acknowledgements

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.

External References

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