CVE-2023-5517

Summary

A flaw in query-handling code can cause named to exit prematurely with an assertion failure when:

  • nxdomain-redirect <domain>; is configured, and
  • the resolver receives a PTR query for an RFC 1918 address that would normally result in an authoritative NXDOMAIN response. This issue affects BIND 9 versions 9.12.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.

Affected Software

VendorProductVersion RangeStatus
ISCBIND 99.12.0 <= 9.16.45affected
ISCBIND 99.18.0 <= 9.18.21affected
ISCBIND 99.19.0 <= 9.19.19affected
ISCBIND 99.16.8-S1 <= 9.16.45-S1affected
ISCBIND 99.18.11-S1 <= 9.18.21-S1affected

Weaknesses

Workarounds

Disabling the nxdomain-redirect feature makes the faulty code path impossible to reach, preventing this flaw from being exploitable.

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References