6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
0.001 Low
EPSS
Percentile
45.5%
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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 12 | all | unbound | < 1.16.2-1 | unbound_1.16.2-1_all.deb |
Debian | 11 | all | unbound | < 1.13.1-1+deb11u1 | unbound_1.13.1-1+deb11u1_all.deb |
Debian | 10 | all | unbound | < 1.9.0-2+deb10u3 | unbound_1.9.0-2+deb10u3_all.deb |
Debian | 999 | all | unbound | < 1.16.2-1 | unbound_1.16.2-1_all.deb |
Debian | 13 | all | unbound | < 1.16.2-1 | unbound_1.16.2-1_all.deb |