DNSSEC Verification Complexity Vulnerability - 20240313004¶
Overview¶
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.
What is vulnerable?¶
| Product(s) Affected | Dated | Summary | Severity | CVSS |
|---|---|---|---|---|
| Windows Server 2012 R2 (Server Core installation) Windows Server 2012 R2 Windows Server 2012 (Server Core installation) Windows Server 2012 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) Windows Server 2008 R2 for x64-based Systems Service Pack 1 Windows Server 2008 R2 for x64-based Systems Service Pack 1 Windows Server 2016 (Server Core installation) Windows Server 2016 Windows Server 2022, 23H2 Edition (Server Core installation) Windows Server 2022 (Server Core installation) Windows Server 2022 Windows Server 2019 (Server Core installation) Windows Server 2019 |
13 Feb 2024 | CVE-2023-50387 | High | 7.5 |
What has been observed?¶
There is no evidence of exploitation affecting Western Australian Government networks at the time of publishing.
Recommendation¶
The WA SOC recommends administrators apply the solutions as per vendor instructions to all affected devices within expected timeframe (refer Patch Management).