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Bug 1495410 - (CVE-2017-14492) CVE-2017-14492 dnsmasq: heap overflow in the IPv6 router advertisement code
CVE-2017-14492 dnsmasq: heap overflow in the IPv6 router advertisement code
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
urgent Severity urgent
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Assigned To: Red Hat Product Security
impact=critical,public=20171002,repor...
: Security
Depends On: 1495516 1495517 1496264 1496265 1497691
Blocks: 1495418
  Show dependency tree / graph
 
Reported: 2017-09-25 21:47 EDT by Fabio Olive Leite
Modified: 2018-04-17 21:50 EDT (History)
23 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 discovered in dnsmasq in the IPv6 router advertisement (RA) handling code. An attacker on the local network segment could send crafted RAs to dnsmasq which would cause it to crash or, potentially, execute arbitrary code. This issue only affected configurations using one of these options: enable-ra, ra-only, slaac, ra-names, ra-advrouter, or ra-stateless.
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Clone Of:
Environment:
Last Closed: 2017-10-02 14:15:15 EDT
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Regression: ---
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Documentation: ---
CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Upstream commit (1.53 KB, patch)
2017-09-26 06:46 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

  None (edit)
Description Fabio Olive Leite 2017-09-25 21:47:17 EDT 
Red Hat Product Security has been made aware of a heap-based buffer overflow affecting the DHCP implementation of dnsmasq.
Comment 1 Doran Moppert 2017-09-26 01:11:36 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 2 Doran Moppert 2017-09-26 04:43:15 EDT 
Versions of dnsmasq shipped with Red Hat Enterprise Linux 6 and 5 do not include the IPv6 Router Advertisement code which includes this flaw.
Comment 3 Tomas Hoger 2017-09-26 04:47:49 EDT 
Further details from the 2.78 pre-release CHANGELOG:

    Fix heap overflow in IPv6 router advertisement code.
    This is a potentially serious security hole, as a
    crafted RA request can overflow a buffer and crash or
    control dnsmasq. Attacker must be on the local network.
    CVE-2017-14492 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 06:46 EDT 
Created attachment 1330990 [details]
Upstream commit
Comment 12 Adam Mariš 2017-10-02 09:19:52 EDT 
Created dnsmasq tracking bugs for this issue:

Affects: fedora-all [bug 1497691]
Comment 14 errata-xmlrpc 2017-10-02 12:23:25 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 15 errata-xmlrpc 2017-10-02 13:20:26 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 16 Garth Mollett 2017-10-03 16:54:17 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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