Vulnerability Description
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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nlnetlabs | Unbound | < 1.16.2 |
| Fedoraproject | Fedora | 35 |
Related Weaknesses (CWE)
References
- https://lists.debian.org/debian-lts-announce/2023/03/msg00024.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202212-02Third Party Advisory
- https://www.nlnetlabs.nl/downloads/unbound/CVE-2022-30698_CVE-2022-30699.txtVendor Advisory
- https://lists.debian.org/debian-lts-announce/2023/03/msg00024.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202212-02Third Party Advisory
- https://www.nlnetlabs.nl/downloads/unbound/CVE-2022-30698_CVE-2022-30699.txtVendor Advisory
FAQ
What is CVE-2022-30699?
CVE-2022-30699 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 f...
How severe is CVE-2022-30699?
CVE-2022-30699 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-30699?
Check the references section above for vendor advisories and patch information. Affected products include: Nlnetlabs Unbound, Fedoraproject Fedora.