Premature Exit and Assertion Failure in BIND 9 Due to Query-Handling Code Flaw
CVE-2023-5517

7.5HIGH

Key Information:

Vendor

Isc
Status
Bind 9
Vendor
CVE Published:
13 February 2024

Badges

👾 Exploit Exists

What is CVE-2023-5517?

A vulnerability exists in the query-handling code of BIND 9 DNS servers, leading to a potential premature exit due to an assertion failure. This occurs when the server is configured with nxdomain-redirect <domain>;, in conjunction with receiving a PTR query for an RFC 1918 address, typically resulting in an authoritative NXDOMAIN response. The flaw affects several versions of BIND 9, indicating a risk that could impact DNS resolution across various network environments, necessitating timely updates and mitigations by system administrators.

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Affected Version(s)

BIND 9 9.12.0 <= 9.16.45

BIND 9 9.18.0 <= 9.18.21

BIND 9 9.19.0 <= 9.19.19

References

https://kb.isc.org/docs/cve-2023-5517
vendor-advisory
http://www.openwall.com/lists/oss-security/2024/02/13/1
https://lists.fedoraproject.org/archives/list/package-ann...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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