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AUSCERT External Security Bulletin Redistribution
ESB-2019.0478
A vulnerability in unbound has been addressed
15 February 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: unbound
Publisher: Debian
Operating System: Debian GNU/Linux 8
Impact/Access: Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-15105
Reference: ESB-2018.1710
ESB-2018.0218
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2019/02/msg00022.html
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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
https://unbound.net/downloads/CVE-2017-15105.txt.
For Debian 8 "Jessie", this problem has been fixed in version
1.4.22-3+deb8u4.
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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