Bug 1507049 (CVE-2017-15105) - CVE-2017-15105 unbound: Improper validation of wildcard synthesized NSEC records
Summary: CVE-2017-15105 unbound: Improper validation of wildcard synthesized NSEC records
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2017-15105
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1536510 1536518
Blocks: 1507052
TreeView+ depends on / blocked
 
Reported: 2017-10-27 14:11 UTC by Pedro Sampaio
Modified: 2021-02-17 01:19 UTC (History)
6 users (show)

Fixed In Version: unbound 1.6.8
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the way unbound validated wildcard-synthesized NSEC records. An improperly validated wildcard NSEC record could be used to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick unbound into accepting a NODATA proof.
Clone Of:
Environment:
Last Closed: 2019-06-08 03:30:06 UTC
Embargoed:

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Description Pedro Sampaio 2017-10-27 14:11:08 UTC 
A vulnerability was discovered in DNSSEC. Processing of wildcard synthesized NSEC records may result in improper validation for non-existance in some implementations of DNSSEC. While synthesis of NSEC records is allowed by RFC4592, the synthesized owner names should not be used in the NSEC processing.
Comment 1 Pedro Sampaio 2017-10-27 14:11:17 UTC 
Acknowledgments:

Name: Ralph Dolmans (NLnet Labs), Karst Koymans (University of Amsterdam)
Comment 5 Adam Mariš 2018-01-19 14:45:24 UTC 
Statement:

This issue affects the versions of unbound as shipped with Red Hat Enterprise Linux 7. Red Hat Product Security has rated this issue as having Moderate security impact. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Comment 6 Adam Mariš 2018-01-19 14:45:28 UTC 
External References:

https://unbound.net/downloads/CVE-2017-15105.txt
Comment 8 Adam Mariš 2018-01-19 14:59:25 UTC 
Created unbound tracking bugs for this issue:

Affects: fedora-all [bug 1536518]
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