CVE-2023-5517 Querying RFC 1918 reverse zones may cause an assertion failure when "nxdomain-redirect" is enabled

What is CVE-2023-5517?

CVE-2023-5517 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 13 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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. 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.

Weakness: CWE-617

Which versions are affected by CVE-2023-5517?

It affects 3 products.

Products include Fedoraproject Fedora, Isc Bind, Netapp Active Iq Unified Manager.

How do I fix CVE-2023-5517?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-5517 being exploited?

There is no known exploitation of CVE-2023-5517 in the wild and no public exploit code.

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• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2023-5517, AZL-34354, AZL-34563, BELL-CVE-2023-5517, DEBIAN-CVE-2023-5517, GHSA-xcvq-77qq-2wpx and 1 more.