CVE-2024-25581

Summary

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.

Affected Software

Weaknesses

• CWE-20: CWE-20 Improper Input Validation

Workarounds

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

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

CVE Program Container

Additional References

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

References

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

• ←Previous
• Next→