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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: NLnet Labs

Published: 2022-08-01T14:13:58.392776Z

Updated: 2024-09-16T18:29:59.438Z

Reserved: 2022-05-13T00:00:00

Link: CVE-2022-30699

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2022-08-01T15:15:09.890

Modified: 2023-11-07T03:47:23.970

Link: CVE-2022-30699

cve-icon Redhat

Severity : Moderate

Publid Date: 2022-08-01T00:00:00Z

Links: CVE-2022-30699 - Bugzilla