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Bug 1507049 - (CVE-2017-15105) CVE-2017-15105 unbound: Improper validation of wildcard synthesized NSEC records
CVE-2017-15105 unbound: Improper validation of wildcard synthesized NSEC records
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180119,repor...
: Security
Depends On: 1536510 1536518
Blocks: 1507052
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Reported: 2017-10-27 10:11 EDT by Pedro Sampaio
Modified: 2018-06-20 16:42 EDT (History)
6 users (show)

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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.
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Description Pedro Sampaio 2017-10-27 10:11:08 EDT 
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 10:11:17 EDT 
Acknowledgments:

Name: Ralph Dolmans (NLnet Labs), Karst Koymans (University of Amsterdam)
Comment 5 Adam Mariš 2018-01-19 09:45:24 EST 
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 09:45:28 EST 
External References:

https://unbound.net/downloads/CVE-2017-15105.txt
Comment 8 Adam Mariš 2018-01-19 09:59:25 EST 
Created unbound tracking bugs for this issue:

Affects: fedora-all [bug 1536518]
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