Bug 1495411 (CVE-2017-14493) - CVE-2017-14493 dnsmasq: stack buffer overflow in the DHCPv6 code
Summary: CVE-2017-14493 dnsmasq: stack buffer overflow in the DHCPv6 code
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-14493
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
urgent
urgent
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1495516 1495517 1496264 1496265 1497691
Blocks: 1495418
TreeView+ depends on / blocked
 
Reported: 2017-09-26 01:50 UTC by Fabio Olive Leite
Modified: 2021-02-17 01:28 UTC (History)
23 users (show)

Fixed In Version: dnsmasq 2.78
Doc Type: If docs needed, set a value
Doc Text:
A stack buffer overflow was found in dnsmasq in the DHCPv6 code. An attacker on the local network could send a crafted DHCPv6 request to dnsmasq which would cause it to a crash or, potentially, execute arbitrary code.
Clone Of:
Environment:
Last Closed: 2017-10-02 18:16:05 UTC
Embargoed:

Attachments (Terms of Use)
Upstream commit (1.45 KB, patch)
2017-09-26 10:47 UTC, Tomas Hoger 		no flags Details | Diff
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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2836 0 normal SHIPPED_LIVE Critical: dnsmasq security update 2017-10-02 21:18:46 UTC
Red Hat Product Errata RHSA-2017:2837 0 normal SHIPPED_LIVE Critical: dnsmasq security update 2017-10-02 20:19:55 UTC

Description Fabio Olive Leite 2017-09-26 01:50:15 UTC 
Red Hat Product Security has been made aware of a stack-based buffer overflow affecting the DHCP implementation of dnsmasq.
Comment 1 Doran Moppert 2017-09-26 05:11:57 UTC 
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 2 Doran Moppert 2017-09-26 08:42:36 UTC 
Versions of dnsmasq shipped with Red Hat Enterprise Linux 6 and 5 do not include the DHCPv6 code which includes this flaw.
Comment 3 Tomas Hoger 2017-09-26 08:48:05 UTC 
Further details from the 2.78 pre-release CHANGELOG:

    Fix stack overflow in DHCPv6 code. An attacker who can send
    a DHCPv6 request to dnsmasq can overflow the stack frame and
    crash or control dnsmasq.
    CVE-2017-14493 applies.
    Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana
    and Kevin Hamacher of the Google Security Team for
    finding this.
Comment 5 Tomas Hoger 2017-09-26 10:47:08 UTC 
Created attachment 1330991 [details]
Upstream commit
Comment 10 Adam Mariš 2017-10-02 13:14:23 UTC 
External References:

https://access.redhat.com/security/vulnerabilities/3199382
https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html
Comment 11 Adam Mariš 2017-10-02 13:19:19 UTC 
Created dnsmasq tracking bugs for this issue:

Affects: fedora-all [bug 1497691]
Comment 12 Tomas Hoger 2017-10-02 13:42:45 UTC 
Upstream commit:

http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=3d4ff1ba8419546490b464418223132529514033

Google Security Team's repository with test cases:

https://github.com/google/security-research-pocs/tree/master/vulnerabilities/dnsmasq
Comment 13 errata-xmlrpc 2017-10-02 16:23:37 UTC 
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 14 errata-xmlrpc 2017-10-02 17:20:39 UTC 
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 15 Garth Mollett 2017-10-03 20:57:20 UTC 
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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