Insufficient Session Expiration Affecting unbound package, versions <1.16.2-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.12% (47th percentile)

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  • Snyk IDSNYK-DEBIAN12-UNBOUND-2964925
  • published2 Aug 2022
  • disclosed1 Aug 2022

Introduced: 1 Aug 2022

CVE-2022-30699  (opens in a new tab)
CWE-613  (opens in a new tab)

How to fix?

Upgrade Debian:12 unbound to version 1.16.2-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unbound package and not the unbound package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

NLnet Labs Unbound, up to and including version 1.16.1, is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.

CVSS Scores

version 3.1