Knot Resolver up to 5.5.1 Filter dns rebinding

Summaryinfo

A vulnerability was found in Knot Resolver up to 5.5.1 and classified as problematic. This affects an unknown function of the component Filter Handler. Such manipulation leads to dns rebinding. This vulnerability is referenced as CVE-2022-32983. No exploit is available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Knot Resolver up to 5.5.1. Affected by this issue is an unknown code of the component Filter Handler. The manipulation with an unknown input leads to a dns rebinding vulnerability. Using CWE to declare the problem leads to CWE-350. The product performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it does not properly ensure that the IP address is truly associated with the hostname. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Knot Resolver through 5.5.1 may allow DNS cache poisoning when there is an attempt to limit forwarding actions by filters.

The weakness was published 06/20/2022 as ccb9d9794db5eb757c33becf65cb1cf48ecfd968. The advisory is available at github.com. This vulnerability is handled as CVE-2022-32983 since 06/10/2022. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1583.002 by the MITRE ATT&CK project.

Applying the patch ccb9d9794db5eb757c33becf65cb1cf48ecfd968 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Name

• Knot Resolver

Version

• 5.5.0
• 5.5.1

License

• open-source

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