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

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Bug 1495409 - (CVE-2017-14491) CVE-2017-14491 dnsmasq: heap overflow in the code responsible for building DNS replies

Summary:	CVE-2017-14491 dnsmasq: heap overflow in the code responsible for building DN...

Status:	CLOSED ERRATA

Aliases:	CVE-2017-14491

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	urgent Severity urgent
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=critical,public=20171002,repor...
Keywords:	Security

Depends On:	1495516 1495517 1496264 1496265 1496277 1496278 1496310 1496311 1496312 1496313 1496314 1496315 1496316 1497691
Blocks:	1495418 1496355
	Show dependency tree / graph

Reported:	2017-09-25 21:42 EDT by Fabio Olive Leite
Modified:	2018-08-01 09:59 EDT (History)
CC List:	24 users (show)

See Also:
Fixed In Version:	dnsmasq 2.78
Doc Type:	If docs needed, set a value
Doc Text:	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.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2017-10-02 14:15:40 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Upstream commit (7.78 KB, patch) 2017-09-26 06:46 EDT, Tomas Hoger	no flags	Details \| Diff
Follow-up patch from upstream (1.62 KB, patch) 2017-09-26 18:24 EDT, Tomas Hoger	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2017:2836	normal	SHIPPED_LIVE	Critical: dnsmasq security update	2017-10-02 17:18:46 EDT
Red Hat Product Errata	RHSA-2017:2837	normal	SHIPPED_LIVE	Critical: dnsmasq security update	2017-10-02 16:19:55 EDT
Red Hat Product Errata	RHSA-2017:2838	normal	SHIPPED_LIVE	Critical: dnsmasq security update	2017-10-02 16:23:56 EDT
Red Hat Product Errata	RHSA-2017:2839	normal	SHIPPED_LIVE	Critical: dnsmasq security update	2017-10-02 17:07:36 EDT
Red Hat Product Errata	RHSA-2017:2840	normal	SHIPPED_LIVE	Critical: dnsmasq security update	2017-10-02 15:20:16 EDT
Red Hat Product Errata	RHSA-2017:2841	normal	SHIPPED_LIVE	Critical: dnsmasq security update	2017-10-02 15:53:55 EDT

Groups: None (edit)

Description Fabio Olive Leite 2017-09-25 21:42:21 EDT

Red Hat Product Security has been made aware of a heap-based buffer overflow affecting the DNS implementation of dnsmasq.

Comment 3 Doran Moppert 2017-09-26 01:10:32 EDT

Acknowledgments:

Name: Felix Wilhelm (Google Security Team), Fermin J. Serna (Google Security Team), Gabriel Campana (Google Security Team), Kevin Hamacher (Google Security Team), Ron Bowes (Google Security Team)

Comment 4 Tomas Hoger 2017-09-26 04:46:50 EDT

Further details from the 2.78 pre-release CHANGELOG:

    Fix heap overflow in DNS code. This is a potentially serious
    security hole. It allows an attacker who can make DNS
    requests to dnsmasq, and who controls the contents of
    a domain, which is thereby queried, to overflow
    (by 2 bytes) a heap buffer and either crash, or
    even take control of, dnsmasq.
    CVE-2017-14491 applies.
    Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana
    and Kevin Hamacher of the Google Security Team for
    finding this.

Comment 8 Tomas Hoger 2017-09-26 06:46 EDT

Created attachment 1330989 [details]
Upstream commit

Comment 13 Tomas Hoger 2017-09-26 18:24 EDT

Created attachment 1331241 [details]
Follow-up patch from upstream

This corrects issues in the original patch as noted in comment 8.

Comment 18 Adam Mariš 2017-10-02 09:08:49 EDT

External References:

https://access.redhat.com/security/vulnerabilities/3199382
https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html

Comment 19 Adam Mariš 2017-10-02 09:19:36 EDT

Created dnsmasq tracking bugs for this issue:

Affects: fedora-all [bug 1497691]

Comment 20 Tomas Hoger 2017-10-02 09:41:34 EDT

Upstream commits:

http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=0549c73b7ea6b22a3c49beb4d432f185a81efcbc
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=62cb936cb7ad5f219715515ae7d32dd281a5aa1f

Google Security Team's repository with test cases:

https://github.com/google/security-research-pocs/tree/master/vulnerabilities/dnsmasq

Comment 22 errata-xmlrpc 2017-10-02 11:20:52 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5 Extended Lifecycle Support

Via RHSA-2017:2840 https://access.redhat.com/errata/RHSA-2017:2840

Comment 23 errata-xmlrpc 2017-10-02 11:54:25 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5.9 Long Life

Via RHSA-2017:2841 https://access.redhat.com/errata/RHSA-2017:2841

Comment 24 errata-xmlrpc 2017-10-02 12:23:13 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.2 Extended Update Support
  Red Hat Enterprise Linux 7.3 Extended Update Support

Via RHSA-2017:2837 https://access.redhat.com/errata/RHSA-2017:2837

Comment 25 errata-xmlrpc 2017-10-02 12:24:37 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:2838 https://access.redhat.com/errata/RHSA-2017:2838

Comment 26 errata-xmlrpc 2017-10-02 13:09:08 EDT

This issue has been addressed in the following products:

  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
  Red Hat Enterprise Linux 6.7 Extended Update Support
  Red Hat Enterprise Linux 6.2 Advanced Update Support

Via RHSA-2017:2839 https://access.redhat.com/errata/RHSA-2017:2839

Comment 27 errata-xmlrpc 2017-10-02 13:20:14 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2836 https://access.redhat.com/errata/RHSA-2017:2836

Comment 28 Garth Mollett 2017-10-02 17:43:01 EDT

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').

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