PowerDNS Recursor up to 4.1.15/4.2.1/4.3.0 Recursive Query Amplification recursion

Summaryinfo

A vulnerability identified as critical has been detected in PowerDNS Recursor up to 4.1.15/4.2.1/4.3.0. This issue affects some unknown processing of the component Recursive Query Handler. The manipulation leads to recursion (Amplification). This vulnerability is listed as CVE-2020-10995. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in PowerDNS Recursor up to 4.1.15/4.2.1/4.3.0 (Domain Name Software). This issue affects some unknown functionality of the component Recursive Query Handler. The manipulation with an unknown input leads to a recursion vulnerability (Amplification). Using CWE to declare the problem leads to CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was presented 05/19/2020 (Website). It is possible to read the advisory at doc.powerdns.com. The identification of this vulnerability is CVE-2020-10995 since 03/27/2020. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 4.1.16, 4.2.2 or 4.3.1 eliminates this vulnerability.

See VDB-155427 and VDB-155420 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Domain Name Software

Name

• PowerDNS Recursor

Version

• 4.0
• 4.1
• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6
• 4.1.7
• 4.1.8
• 4.1.9
• 4.1.10
• 4.1.11
• 4.1.12
• 4.1.13
• 4.1.14
• 4.1.15
• 4.2
• 4.2.0
• 4.2.1
• 4.3.0

License

• free

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

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Entryinfo

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