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CVE-2023-5517: Querying RFC 1918 reverse zones may cause an assertion failure when nxdomain-redirect is enabled
CVE: CVE-2023-5517
Title: Querying RFC 1918 reverse zones may cause an assertion failure when "nxdomain-redirect" is enabled
Document version: 2.0
Posting date: 13 February 2024
Program impacted: BIND 9
Versions affected:
BIND
- 9.12.0 -> 9.16.45
- 9.18.0 -> 9.18.21
- 9.19.0 -> 9.19.19
BIND Supported Preview Edition
- 9.16.8-S1 -> 9.16.45-S1
- 9.18.11-S1 -> 9.18.21-S1
Severity: High
Exploitable: Remotely
Description:
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.
Impact:
If both of the above conditions are met, a single suitable query will cause named
to crash.
CVSS Score: 7.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H&version=3.1.
Workarounds:
Disabling the nxdomain-redirect
feature makes the faulty code path impossible to reach, preventing this flaw from being exploitable.
Active exploits:
We are not aware of any active exploits.
Solution:
Upgrade to the patched release most closely related to your current version of BIND 9:
- 9.16.48
- 9.18.24
- 9.19.21
BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.
- 9.16.48-S1
- 9.18.24-S1
Document revision history:
- 1.0 Early Notification, 10 January 2024
- 1.1 Revised Early Notification, 15 January 2024
- 1.2 Revised the list of fixed versions, 11 February 2024
- 2.0 Public disclosure, 13 February 2024
Related documents:
See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected.
Do you still have questions? Questions regarding this advisory should be mailed to bind-security@isc.org or posted as confidential GitLab issues at https://gitlab.isc.org/isc-projects/bind9/-/issues/new?issue[confidential]=true.
Note:
ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/.
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861.
The Knowledgebase article https://kb.isc.org/docs/cve-2023-5517 is the complete and official security advisory document.
Legal Disclaimer:
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