Bug 1646386 (CVE-2018-16852)

Summary:	CVE-2018-16852 samba: NULL pointer de-reference in Samba AD DC DNS management server
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
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, abokovoy, anoopcs, asn, bmcclain, dbaker, dblechte, dfediuck, eedri, gdeschner, jarrpa, jokerman, jstephen, lmohanty, madam, mgoldboi, michal.skrivanek, rhs-smb, sankarshan, sbonazzo, sbose, security-response-team, sherold, sisharma, smohan, ssaha, ssorce, sthangav, trankin, vbellur
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	samba 4.9.3	Doc Type:	If docs needed, set a value
Doc Text:	A null pointer dereference flaw was found in the Samba DNS Management server when used as an Active Directory Domain Controller. A remote attacker could use this flaw to cause a denial of service (application crash).	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-11-28 07:32:38 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:	1654092
Bug Blocks:	1646387

Description Laura Pardo 2018-11-05 13:43:00 UTC

A flaw was found in samba versions from 4.9.0. During the processing of an DNS zone in the DNS management DCE/RPC server, if the DSPROPERTY_ZONE_MASTER_SERVERS property or DSPROPERTY_ZONE_SCAVENGING_SERVERS property is set, the server will follow a NULL pointer and terminate. This could lead to a Denial of Service attack.

Comment 2 Sam Fowler 2018-11-28 02:57:27 UTC

External Reference:

https://www.samba.org/samba/security/CVE-2018-16852.html

Comment 3 Sam Fowler 2018-11-28 02:57:38 UTC

Acknowledgments:

Name: The Samba Team
Upstream: Fabrizio Faganello

Comment 4 Sam Fowler 2018-11-28 02:58:08 UTC

Created samba tracking bugs for this issue:

Affects: fedora-29 [bug 1654092]

Comment 5 Huzaifa S. Sidhpurwala 2018-11-28 07:32:54 UTC

Statement:

This flaw does not affect the version of samba shipped with Red Hat Enterprise Linux because there is no support for samba as Active Directory Domain Controller.