Bug 2116729 (CVE-2022-30699)

Summary:	CVE-2022-30699 unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names
Product:	[Other] Security Response	Reporter:	Sandipan Roy <saroy>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aegorenkov.91, akhaitovich, paul.wouters, pemensik, pj.pandit
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	unbound 1.16.2	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in Unbound, which is vulnerable to a novel type of "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before the expiry of the delegation information by querying Unbound for a second-level subdomain in which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-12-06 12:33:21 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:	2116734, 2116735, 2116736, 2116737
Bug Blocks:	2113806

Description Sandipan Roy 2022-08-09 09:21:52 UTC

NLnet Labs Unbound, up to and including version 1.16.1, is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.

https://www.nlnetlabs.nl/downloads/unbound/CVE-2022-30698_CVE-2022-30699.txt

Comment 1 Sandipan Roy 2022-08-09 09:26:44 UTC

Upstream Patch: https://github.com/NLnetLabs/unbound/commit/f6753a0f1018133df552347a199e0362fc1dac68

Comment 2 Sandipan Roy 2022-08-09 09:28:20 UTC

Created unbound tracking bugs for this issue:

Affects: fedora-35 [bug 2116735]
Affects: fedora-36 [bug 2116736]

Comment 4 errata-xmlrpc 2022-11-08 09:51:07 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:7622 https://access.redhat.com/errata/RHSA-2022:7622

Comment 5 errata-xmlrpc 2022-11-15 10:08:15 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2022:8062 https://access.redhat.com/errata/RHSA-2022:8062

Comment 6 Product Security DevOps Team 2022-12-06 12:33:19 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-2022-30699

Comment 8 errata-xmlrpc 2024-04-25 06:47:33 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:2045 https://access.redhat.com/errata/RHSA-2024:2045