Bug 2216581 (CVE-2023-2829)

Summary:	CVE-2023-2829 bind: DNSSEC-Validated cache can be remotely terminated with malformed NSEC record
Product:	[Other] Security Response	Reporter:	Anten Skrabec <askrabec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	mosvald, pemensik, saroy, sbroz
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 vulnerability was found in BIND. This security flaw occurs when a named instance is configured to run as a DNSSEC-validating recursive resolver with the Aggressive Use of DNSSEC-Validated Cache (RFC 8198) option (synth-from-dnssec) enabled; remote termination can occur using a zone with a malformed NSEC record.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-06-28 17:41:01 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:	2216623, 2216624, 2216625, 2216633, 2216634, 2216635, 2216636, 2216637, 2216638, 2216639, 2216640, 2216641, 2217445, 2217446, 2217447, 2217448
Bug Blocks:	2216252

Description Anten Skrabec 2023-06-21 22:24:55 UTC

A `named` instance configured to run as a DNSSEC-validating recursive resolver with the Aggressive Use of DNSSEC-Validated Cache (RFC 8198) option (`synth-from-dnssec`) enabled can be remotely terminated using a zone with a malformed NSEC record.
This issue affects BIND 9 versions 9.16.8-S1 through 9.16.41-S1 and 9.18.11-S1 through 9.18.15-S1.

https://kb.isc.org/docs/cve-2023-2829

Comment 1 Sandipan Roy 2023-06-22 05:49:11 UTC

Created bind tracking bugs for this issue:

Affects: fedora-37 [bug 2216623]
Affects: fedora-38 [bug 2216625]


Created dhcp tracking bugs for this issue:

Affects: fedora-37 [bug 2216624]

Comment 3 Petr Menšík 2023-06-22 14:07:44 UTC

According to upstream article [1] this is only affecting supported preview version. We do not have it in RHEL or even in Fedora. 
That is also why upstream release notes [2] of latest 9.16 does not mention this vulnerability.
We are not affected by this one. In any release or component. Nor have a change to backport.

Can all those bugs be closed?

1. https://kb.isc.org/docs/cve-2023-2829
2. https://downloads.isc.org/isc/bind9/9.16.42/doc/arm/html/notes.html#security-fixes

Comment 6 Product Security DevOps Team 2023-06-28 17:40:59 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-2023-2829