| Summary | PowerDNS Recursor from 4.1.0 up to and including 4.3.0 does not sufficiently defend against amplification attacks. An issue in the DNS protocol has been found that allow malicious parties to use recursive DNS services to attack third party authoritative name servers. The attack uses a crafted reply by an authoritative name server to amplify the resulting traffic between the recursive and other authoritative name servers. Both types of service can suffer degraded performance as an effect. This is triggered by random subdomains in the NSDNAME in NS records. PowerDNS Recursor 4.1.16, 4.2.2 and 4.3.1 contain a mitigation to limit the impact of this DNS protocol issue. |
|---|---|
| Publication Date | May 20, 2020, 2:15 a.m. |
| Registration Date | Jan. 26, 2021, 11:50 a.m. |
| Last Update | Nov. 21, 2024, 1:56 p.m. |
| CVSS3.1 : HIGH | |
| スコア | 7.5 |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 攻撃元区分(AV) | ネットワーク |
| 攻撃条件の複雑さ(AC) | 低 |
| 攻撃に必要な特権レベル(PR) | 不要 |
| 利用者の関与(UI) | 不要 |
| 影響の想定範囲(S) | 変更なし |
| 機密性への影響(C) | なし |
| 完全性への影響(I) | なし |
| 可用性への影響(A) | 高 |
| CVSS2.0 : MEDIUM | |
| Score | 5.0 |
|---|---|
| Vector | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| 攻撃元区分(AV) | ネットワーク |
| 攻撃条件の複雑さ(AC) | 低 |
| 攻撃前の認証要否(Au) | 不要 |
| 機密性への影響(C) | なし |
| 完全性への影響(I) | なし |
| 可用性への影響(A) | 低 |
| Get all privileges. | いいえ |
| Get user privileges | いいえ |
| Get other privileges | いいえ |
| User operation required | いいえ |
| Configuration1 | or higher | or less | more than | less than | |
| cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:* | 4.1.0 | 4.3.0 | |||
| Configuration2 | or higher | or less | more than | less than | |
| cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* | |||||
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | |||||
| Configuration3 | or higher | or less | more than | less than | |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | |||||
| Configuration4 | or higher | or less | more than | less than | |
| cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* | |||||
| cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:* | |||||
| Title | PowerDNS Recursor における再帰制御に関する脆弱性 |
|---|---|
| Summary | PowerDNS Recursor には、再帰制御に関する脆弱性が存在します。 |
| Possible impacts | サービス運用妨害 (DoS) 状態にされる可能性があります。 |
| Solution | ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。 |
| Publication Date | May 19, 2020, midnight |
| Registration Date | June 19, 2020, 11:31 a.m. |
| Last Update | June 19, 2020, 11:31 a.m. |
| PowerDNS |
| PowerDNS Recursor 4.1.0 から 4.3.0 |
| No | Changed Details | Date of change |
|---|---|---|
| 1 | [2020年06月19日] 掲載 |
June 19, 2020, 11:31 a.m. |