CVE-2022-30698 — Novel "ghost domain names" attack by introducing subdomain delegations

Affected: NLnet Labs Unbound

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 subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before expiry of the delegation information by querying Unbound for a second level subdomain which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation. From version 1.16.2 on, Unbound checks the validity of parent delegation records before using cached delegation information.

USN-5569-1 — unbound vulnerabilities

Affected: Ubuntu:18.04:LTS: unbound, Ubuntu:20.04:LTS: unbound, Ubuntu:22.04:LTS: unbound

Xiang Li discovered that Unbound incorrectly handled delegation caching. A remote attacker could use this issue to keep rogue domain names resolvable long after they have been revoked.

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CVE-2022-30698 — Novel "ghost domain names" attack by introducing subdomain delegations

USN-5569-1 — unbound vulnerabilities