CVE-2022-30698
Publication date 1 August 2022
Last updated 24 July 2024
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| unbound | 24.10 oracular |
Fixed 1.16.2-1
|
| 24.04 LTS noble |
Fixed 1.16.2-1
|
|
| 22.04 LTS jammy |
Fixed 1.13.1-1ubuntu5.1
|
|
| 20.04 LTS focal |
Fixed 1.9.4-2ubuntu1.3
|
|
| 18.04 LTS bionic |
Fixed 1.6.7-1ubuntu2.5
|
|
| 16.04 LTS xenial |
Vulnerable
|
|
| 14.04 LTS trusty | Ignored end of ESM support, was needed |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
6.5 · Medium
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-5569-1
- Unbound vulnerabilities
- 16 August 2022