CVE-2023-50387 Denial of service in n/a

What is CVE-2023-50387?

CVE-2023-50387 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 14 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.

Weakness: CWE-770

Which versions are affected by CVE-2023-50387?

It affects 13 products.

Products include Fedoraproject Fedora, Isc Bind, Microsoft Windows Server 2008, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019 and 7 more.

How do I fix CVE-2023-50387?

Apply the vendor's patch.

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-2023-50387 being exploited?

There is no known exploitation of CVE-2023-50387 in the wild and no public exploit code.

Public exploit code: 3 proofs of concept on GitHub.

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• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• 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-2023-50387, AZL-34350, AZL-34419, AZL-34440, AZL-34559, AZL-35328 and 8 more.