Bug 1578591 (CVE-2018-5736)

Summary:	CVE-2018-5736 bind: Multiple transfers of a zone in quick succession can cause an assertion failure in rbtdb.c
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, dbaker, jokerman, jpopelka, mruprich, msehnout, pemensik, pzhukov, security-response-team, sfowler, sthangav, thozza, trankin, vonsch, yozone, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	bind 9.12.1-P2	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the way zone databases were handled by bind. An attacker with permissions to initiate a zone transfer could cause bind to crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-05-17 04:01:31 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:	1578903
Bug Blocks:	1578592

Description Sam Fowler 2018-05-15 23:52:04 UTC

BIND versions 9.12.0 and 9.12.1 have an error in zone database reference counting that can lead to an assertion failure if a server attempts several transfers of a slave zone in quick succession.

This defect could be deliberately exercised by an attacker who is permitted to cause a vulnerable server to initiate zone transfers (for example: by sending valid NOTIFY messages), causing the named process to exit after failing the assertion test.

Comment 2 Huzaifa S. Sidhpurwala 2018-05-17 03:59:20 UTC

Statement:

This security flaw only affects bind versions 9.12.0 and 9.12.1. Since Red Hat Enterprise Linux does not ship any of these bind versions, it is not affected.

Comment 3 Sam Fowler 2018-05-20 23:47:29 UTC

External Reference:

https://kb.isc.org/article/AA-01602/74/CVE-2018-5736


Upstream Patch:

https://ftp.isc.org/isc/bind9/9.12.1-P2/patches/cve5736.patch