CVE-2024-25581

Transfer requests received over DoH can lead to a denial of service in DNSdist

Description

When incoming DNS over HTTPS support is enabled using the nghttp2 provider, and queries are routed to a tcp-only or DNS over TLS backend, an attacker can trigger an assertion failure in DNSdist by sending a request for a zone transfer (AXFR or IXFR) over DNS over HTTPS, causing the process to stop and thus leading to a Denial of Service. DNS over HTTPS is not enabled by default, and backends are using plain DNS (Do53) by default.

Remediation

Workaround:

  • Option 1: refuse incoming XFR requests via a DNSdist rule: addAction(OrRule({QTypeRule(DNSQType.AXFR), QTypeRule(DNSQType.IXFR)}), RCodeAction(DNSRCode.REFUSED)). Option 2: switch to the legacy h2o provider by setting library='h2o' in the addDOHLocal directive

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.18%
Affected: PowerDNS DNSdist
Published at:
Updated at:

References

Link Tags
https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2024-03.html
http://www.openwall.com/lists/oss-security/2024/05/13/1

Frequently Asked Questions

What is the severity of CVE-2024-25581?
CVE-2024-25581 has been scored as a high severity vulnerability.
How to fix CVE-2024-25581?
As a workaround for remediating CVE-2024-25581: Option 1: refuse incoming XFR requests via a DNSdist rule: addAction(OrRule({QTypeRule(DNSQType.AXFR), QTypeRule(DNSQType.IXFR)}), RCodeAction(DNSRCode.REFUSED)). Option 2: switch to the legacy h2o provider by setting library='h2o' in the addDOHLocal directive
Is CVE-2024-25581 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-25581 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-25581?
CVE-2024-25581 affects PowerDNS DNSdist.
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