CVE-2022-30699

Publication date 1 August 2022

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.5 · Medium

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
unbound 25.04 plucky
Fixed 1.16.2-1
24.10 oracular
Fixed 1.16.2-1
24.04 LTS noble
Fixed 1.16.2-1
23.10 mantic
Fixed 1.16.2-1
23.04 lunar
Fixed 1.16.2-1
22.10 kinetic
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
Vulnerable

Notes

mdeslaur

same commit as CVE-2022-30698

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
unbound

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

Other references