Bug 1837604 (CVE-2020-12663)

Summary:	CVE-2020-12663 unbound: infinite loop via malformed DNS answers received from upstream servers
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:	Petr Sklenar <psklenar>
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aegorenk, akhaitov, pemensik, pj.pandit, pwouters, uwe.knop
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in unbound in versions prior to 1.10.1. An infinite loop can be created when malformed DNS answers are received from upstream servers. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-06-08 11:20:31 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:	1837609, 1840257, 1840258, 1840259, 1840260, 1840261, 1840262, 1840263, 1879513
Bug Blocks:	1837616

Description Guilherme de Almeida Suckevicz 2020-05-19 17:40:02 UTC

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

References:
http://www.openwall.com/lists/oss-security/2020/05/19/5
https://nlnetlabs.nl/downloads/unbound/CVE-2020-12662_2020-12663.txt

Comment 1 Guilherme de Almeida Suckevicz 2020-05-19 17:40:27 UTC

Created unbound tracking bugs for this issue:

Affects: fedora-all [bug 1837609]

Comment 2 Riccardo Schirone 2020-05-26 15:59:52 UTC

Upstream fix:
https://github.com/NLnetLabs/unbound/commit/ba0f382eee814e56900a535778d13206b86b6d49

Comment 4 Riccardo Schirone 2020-06-03 11:26:57 UTC

In reply to comment #2:
> Upstream fix:
> https://github.com/NLnetLabs/unbound/commit/
> ba0f382eee814e56900a535778d13206b86b6d49

According to https://github.com/NLnetLabs/unbound/issues/243#issuecomment-637298509, the changes related to this particular CVE are only those in iterator/iter_scrub.c and util/data/dname.c. The other changes are for CVE-2020-12662.

Comment 5 errata-xmlrpc 2020-06-08 08:24:30 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:2414 https://access.redhat.com/errata/RHSA-2020:2414

Comment 6 errata-xmlrpc 2020-06-08 09:37:29 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:2416 https://access.redhat.com/errata/RHSA-2020:2416

Comment 7 errata-xmlrpc 2020-06-08 10:17:09 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

Via RHSA-2020:2418 https://access.redhat.com/errata/RHSA-2020:2418

Comment 8 errata-xmlrpc 2020-06-08 10:24:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2020:2419 https://access.redhat.com/errata/RHSA-2020:2419

Comment 9 Product Security DevOps Team 2020-06-08 11:20:31 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-12663

Comment 10 errata-xmlrpc 2020-06-22 07:21:04 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2020:2640 https://access.redhat.com/errata/RHSA-2020:2640

Comment 13 errata-xmlrpc 2020-10-06 14:22:43 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Extended Update Support

Via RHSA-2020:4181 https://access.redhat.com/errata/RHSA-2020:4181