Bug 1549960 (CVE-2018-5732)

Summary:	CVE-2018-5732 dhcp: Buffer overflow in dhclient possibly allowing code execution triggered by malicious server
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	apmukher, dcantrell, dkholia, jpopelka, pemensik, pzhukov, security-response-team, thozza, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	dhcp 4.1-ESV-R15-P1, dhcp 4.3.6-P1, dhcp 4.4.1	Doc Type:	If docs needed, set a value
Doc Text:	An out-of-bound memory access flaw was found in the way dhclient processed a DHCP response packet. A malicious DHCP server could potentially use this flaw to crash dhclient processes running on DHCP client machines via a crafted DHCP response packet.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-03-13 09:03:31 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1549978, 1549979, 1549998, 1550082, 1550083, 1550246, 1550248
Bug Blocks:	1549964

Description Adam Mariš 2018-02-28 07:28:02 UTC

Failure to properly bounds check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section.

Versions of DHCP affected: 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0

Comment 2 Adam Mariš 2018-02-28 07:45:00 UTC

Acknowledgments:

Name: ISC
Upstream: Felix Wilhelm (Google)

Comment 8 Tomas Hoger 2018-02-28 20:30:32 UTC

Public now via upstream advisory.

External References:

https://kb.isc.org/article/AA-01565

Comment 9 Tomas Hoger 2018-02-28 20:32:06 UTC

Created dhcp tracking bugs for this issue:

Affects: fedora-all [bug 1550246]

Comment 11 Tomas Hoger 2018-03-01 12:39:51 UTC

Upstream commit:

https://source.isc.org/cgi-bin/gitweb.cgi?p=dhcp.git;a=commitdiff;h=c5931725b48b121d232df4ba9e45bc41e0ba114d

Upstream bug (not public):

https://bugs.isc.org/Public/Bug/Display.html?id=47139

Comment 12 errata-xmlrpc 2018-03-09 10:06:01 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:0469 https://access.redhat.com/errata/RHSA-2018:0469

Comment 13 errata-xmlrpc 2018-03-12 18:46:28 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0483 https://access.redhat.com/errata/RHSA-2018:0483