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CVE-2022-30698

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 202212-02
Posted Dec 19, 2022
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202212-2 - Multiple vulnerabilities have been discovered in Unbound, the worst of which could result in denial of service. Versions less than 1.16.3 are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2022-30698, CVE-2022-30699, CVE-2022-3204
SHA-256 | bc25bbca2e03be12cd98eded3c6829b21c6e5ce8d93a049f4a2f4372c26d4986
Red Hat Security Advisory 2022-8062-01
Posted Nov 16, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-8062-01 - The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.

tags | advisory
systems | linux, redhat
advisories | CVE-2022-30698, CVE-2022-30699
SHA-256 | ad9465480ac5831015271d46593c2eb547ef8d26212fe261232dadc6e754d449
Red Hat Security Advisory 2022-7622-01
Posted Nov 8, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-7622-01 - The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.

tags | advisory
systems | linux, redhat
advisories | CVE-2022-30698, CVE-2022-30699
SHA-256 | 17bb905be48b007a9b72bda11e1d45d88c2fc589df036c97031af96792657c31
Ubuntu Security Notice USN-5569-1
Posted Aug 16, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5569-1 - 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.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2022-30698
SHA-256 | 4fc02ce3970553ff9b60bbcacacd72056e2d68b7898f270de8d67785a55ece74
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