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CVE-2017-15105

Published: 23 January 2018

A flaw was found in the way unbound before 1.6.8 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.

From the Ubuntu Security Team

Ralph Dolmans and Karst Koymans discovered that Unbound did not properly handle certain NSEC records. An attacker could use this to to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick Unbound into accepting a NODATA proof.

Priority

Low

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
unbound
Launchpad, Ubuntu, Debian
upstream
Released (1.6.8)
trusty
Released (1.4.22-1ubuntu4.14.04.3)
xenial
Released (1.5.8-1ubuntu1.1)
artful
Released (1.6.5-1ubuntu0.2)
bionic
Released (1.6.7-1ubuntu2.1)
Patches:
upstream: https://unbound.net/downloads/patch_cve_2017_15105.diff

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N