Summaryinfo

A vulnerability was found in PowerDNS and PowerDNS Recursor. It has been classified as critical. This impacts an unknown function of the component TSIG Signature Handler. Performing a manipulation results in input validation. This vulnerability is identified as CVE-2016-7073. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Detailsinfo

A vulnerability was found in PowerDNS and PowerDNS Recursor (Domain Name Software) (unknown version). It has been classified as critical. This affects an unknown code block of the component TSIG Signature Handler. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An issue has been found in PowerDNS before 3.4.11 and 4.0.2, and PowerDNS recursor before 4.0.4, allowing an attacker in position of man-in-the-middle to alter the content of an AXFR because of insufficient validation of TSIG signatures. A missing check of the TSIG time and fudge values was found in AXFRRetriever, leading to a possible replay attack.

The bug was discovered 12/15/2016. The weakness was released 09/11/2018 as not defined bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2016-7073 since 08/23/2016. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 44 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 96849 (Fedora 25 : pdns (2017-cbd5501d31)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175940 (Debian Security Update for pdns (DSA 3764-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (96849). Entries connected to this vulnerability are available at VDB-123797, VDB-123888, VDB-123892 and VDB-126386. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Domain Name Software

Name

• PowerDNS
• PowerDNS Recursor

License

• open-source

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