CVE-2022-30699 Novel "ghost domain names" attack by updating almost expired delegation information
Attackers can maintain rogue DNS delegation information by exploiting race conditions in cache expiration, bypassing security controls.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-30699?
CVE-2022-30699 is a medium-severity vulnerability in Fedoraproject Fedora, published on 1 Aug 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-613
Which versions are affected by CVE-2022-30699?
It affects 2 products.
Products include Fedoraproject Fedora, Nlnetlabs Unbound.
How do I fix CVE-2022-30699?
Upgrade to a fixed version.
Is CVE-2022-30699 being exploited?
There is no known exploitation of CVE-2022-30699 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as ALPINE-CVE-2022-30699, AZL-10453, DEBIAN-CVE-2022-30699, GHSA-fjfh-84xh-5hv3, UBUNTU-CVE-2022-30699.