Bug 1869477 (CVE-2020-8623)

Summary:	CVE-2020-8623 bind: remotely triggerable assertion failure in pk11.c
Product:	[Other] Security Response	Reporter:	Huzaifa S. Sidhpurwala <huzaifas>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aegorenk, anon.amish, apmukher, lilhuang, mruprich, msehnout, pemensik, pzhukov, security-response-team, thozza, vonsch, yozone, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	bind 9.11.22, bind 9.16.6, bind 9.17.4	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in bind. An assertion failure can occur when a specially crafted query for a zone signed with an RSA key. BIND must be compiled with "--enable-native-pkcs11" for the system to be affected. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-04 02:26:27 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:	1869769, 1869770, 1870905, 1874952, 1874956, 1874959, 1874962
Bug Blocks:	1869469

Description Huzaifa S. Sidhpurwala 2020-08-18 04:58:02 UTC

As per upstream advisory:

If BIND is built with "--enable-native-pkcs11" then a specially crafted query for a zone signed with RSA can trigger an assertion failure.

An attacker that can reach a vulnerable system with a specially crafted query packet can trigger a crash.

To be vulnerable, the system must:

-  be running BIND that was built with "--enable-native-pkcs11"
-  be signing one or more zones with an RSA key
-  be able to receive queries from a possible attacker

Comment 1 Huzaifa S. Sidhpurwala 2020-08-18 04:58:05 UTC

Acknowledgments:

Name: ISC
Upstream: Lyu Chiy

Comment 5 Huzaifa S. Sidhpurwala 2020-08-21 02:19:33 UTC

External References:

https://kb.isc.org/docs/cve-2020-8623

Comment 6 Huzaifa S. Sidhpurwala 2020-08-21 02:20:36 UTC

Created bind tracking bugs for this issue:

Affects: fedora-all [bug 1870905]

Comment 7 Huzaifa S. Sidhpurwala 2020-08-26 16:03:29 UTC

Upstream commit: https://gitlab.isc.org/isc-projects/bind9/-/commit/8d807cc21655eaa6e6a08afafeec3682c0f3f2ab

Comment 23 errata-xmlrpc 2020-11-04 01:30:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4500 https://access.redhat.com/errata/RHSA-2020:4500

Comment 24 Product Security DevOps Team 2020-11-04 02:26:27 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-2020-8623

Comment 27 errata-xmlrpc 2020-11-10 10:01:03 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Extended Update Support

Via RHSA-2020:4992 https://access.redhat.com/errata/RHSA-2020:4992

Comment 28 errata-xmlrpc 2020-11-10 13:00:03 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:5011 https://access.redhat.com/errata/RHSA-2020:5011

Comment 30 errata-xmlrpc 2020-11-24 11:33:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Extended Update Support

Via RHSA-2020:5203 https://access.redhat.com/errata/RHSA-2020:5203