Insufficient Session Expiration Affecting unbound-libs package, versions <0:1.16.2-2.el8


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.11% (46th percentile)

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  • Snyk IDSNYK-RHEL8-UNBOUNDLIBS-4336664
  • published9 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 RHEL:8 unbound-libs to version 0:1.16.2-2.el8 or higher.
This issue was patched in RHSA-2022:7622.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unbound-libs package and not the unbound-libs package as distributed by RHEL. See How to fix? for RHEL:8 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