RHEA-2024:0537HighCVSS 7.5

Red Hat Enhancement Advisory: ExternalDNS Operator 1.0 operator/operand containers

Published
January 29, 2024
Last Modified
August 18, 2026

🔗 CVE IDs covered (1)

CVE-2023-44487 →

📋 Description

CVE-2023-44487 — HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid Reset Attack)

🎯 Affected products4

  • EXT-DNS-OPTR 1.0 for RHEL 8
  • edo/external-dns-operator-bundle@sha256:0a86a1808d9906eb57886d3d3cd5c04cf9578a80860342132d36ecfc411bf807_amd64 as a component of EXT-DNS-OPTR 1.0 for RHEL 8
  • edo/external-dns-rhel8-operator@sha256:7aa44d1a6c82bc96b3ce738b5a695052cec5295092661fdf4d999614ec067bab_amd64 as a component of EXT-DNS-OPTR 1.0 for RHEL 8
  • edo/external-dns-rhel8@sha256:fd00c08ac6cfd7d0bc86d7734732d2ee7ae6bf5f87a17e8f6eef7ed4621722c1_amd64 as a component of EXT-DNS-OPTR 1.0 for RHEL 8

✅ Remediation

Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 Workaround: Users are strongly urged to update their software as soon as fixes are available. There are several mitigation approaches for this flaw. 1. If circumstances permit, users may disable http2 endpoints to circumvent the flaw altogether until a fix is available. 2. IP-based blocking or flood protection and rate control tools may be used at network endpoints to filter incoming traffic. 3. Several package specific mitigations are also available. a. nginx: https://www.nginx.com/blog/http-2-rapid-reset-attack-impacting-f5-nginx-products/ b. netty: https://github.com/netty/netty/security/advisories/GHSA-xpw8-rcwv-8f8p c. haproxy: https://www.haproxy.com/blog/haproxy-is-not-affected-by-the-http-2-rapid-reset-attack-cve-2023-44487 d. nghttp2: https://github.com/nghttp2/nghttp2/security/advisories/GHSA-vx74-f528-fxqg e. golang: The default stream concurrency limit in golang is 250 streams (requests) per HTTP/2 connection. This value may be adjusted in the golang.org/x/net/http2 package using the Server.MaxConcurrentStreams setting and the ConfigureServer function which are available in golang.org/x/net/http2.

🔗 References (2)