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AUSCERT External Security Bulletin Redistribution
A vulnerability in unbound has been addressed
15 February 2019
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
Impact/Access: Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
CVE Names: CVE-2017-15105
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Package : unbound
Version : 1.4.22-3+deb8u4
CVE ID : CVE-2017-15105
Debian Bug : 887733
Ralph Dolmans and Karst Koymans found a flaw in the way unbound, a
validating, recursive, caching DNS resolver, 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.
For more information please refer to the upstream advisory at
For Debian 8 "Jessie", this problem has been fixed in version
We recommend that you upgrade your unbound packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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