Nic: >> Knot Resolver >> 1.2.6 Security Vulnerabilities
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.
CVSS Score
7.5
EPSS Score
0.396
Published
2024-02-14
Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from servers.
CVSS Score
7.5
EPSS Score
0.001
Published
2023-10-22
Knot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and potentially causing a denial of service. Specifically, a single client query may lead to a hundred TCP connection attempts if a DNS server closes connections without providing a response.
CVSS Score
7.5
EPSS Score
0.002
Published
2023-02-21
Knot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU consumption) because of algorithmic complexity. During an attack, an authoritative server must return large NS sets or address sets.
CVSS Score
7.5
EPSS Score
0.003
Published
2022-09-23
Knot Resolver through 5.5.1 may allow DNS cache poisoning when there is an attempt to limit forwarding actions by filters.
CVSS Score
5.3
EPSS Score
0.003
Published
2022-06-20
Knot Resolver before 5.3.2 is prone to an assertion failure, triggerable by a remote attacker in an edge case (NSEC3 with too many iterations used for a positive wildcard proof).
CVSS Score
7.5
EPSS Score
0.003
Published
2021-08-25
A flaw was found in knot-resolver before version 2.3.0. Malformed DNS messages may cause denial of service.
CVSS Score
7.5
EPSS Score
0.005
Published
2021-03-30
Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.
CVSS Score
7.5
EPSS Score
0.005
Published
2020-05-19
knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might be processed very inefficiently, in extreme cases taking even several CPU seconds for each such uncached message. For example, a few thousand A records can be squashed into one DNS message (limit is 64kB).
CVSS Score
7.5
EPSS Score
0.003
Published
2019-12-16
Cache Poisoning issue exists in DNS Response Rate Limiting.
CVSS Score
5.9
EPSS Score
0.011
Published
2019-11-05
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