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CoreDNS Vulnerability Lets Attackers Pin DNS Cache & Deny Service Updates — CyberDudeBivash Exclusive Report

 


Introduction

The Domain Name System (DNS) is the backbone of the Internet, translating human-readable domain names into IP addresses. In cloud-native environments like Kubernetes, CoreDNS has become the de facto DNS server.

But with great reliance comes great risk. Multiple vulnerabilities in CoreDNS’s caching mechanism (notably CVE-2023-30464 and CVE-2024-0874) have exposed enterprises to DNS cache poisoning attacks, enabling adversaries to “pin” malicious entries into the DNS cache and block legitimate service updates.

In this CyberDudeBivash exclusive deep-dive, we’ll analyze:

  • How CoreDNS works and where it fails.

  • The vulnerabilities enabling DNS cache manipulation.

  • Technical attack chains to “freeze” DNS states.

  • Real-world risks for Kubernetes clusters, SaaS platforms, and enterprises.

  • A CyberDudeBivash defense playbook with actionable steps.

 Understanding CoreDNS

  • What is CoreDNS?
    A flexible DNS server written in Go, widely used in Kubernetes clusters as the default DNS and service discovery mechanism.

  • Core Feature: Caching
    CoreDNS caches DNS responses for efficiency. But weak cache validation and improper handling of responses leave the door open for attackers.

 The Vulnerabilities

1. CVE-2023-30464 — Birthday Attack Cache Poisoning

  • Exploits transaction ID collisions in DNS requests.

  • Attackers flood CoreDNS with spoofed responses until one matches → malicious entry is cached.

  • Malicious domains stay cached for TTL duration → legitimate updates ignored.

2. CVE-2024-0874 — Invalid Cache Entries (CD Bit Handling)

  • CoreDNS cached responses with invalid CD (Checking Disabled) flags.

  • Result: stale or tampered responses reused for legitimate queries.

  • Risk: blocks updates and misroutes service traffic.

 Attack Scenarios

Scenario 1: Pinning Malicious IPs

  1. Attacker injects fake DNS response mapping update.service.com to their IP.

  2. CoreDNS caches it → Kubernetes pods resolve malicious IP.

  3. Legitimate service updates ignored until cache expires.

Scenario 2: Denial of Service Updates

  • Attacker poisons DNS cache with expired or invalid records.

  • Legitimate update servers cannot be reached → software patches, container pulls fail.

Scenario 3: Man-in-the-Middle with Long TTLs

  • Fake records with very long TTLs force persistent hijacking.

  • Even service restarts rely on poisoned DNS.

 Business & Technical Impact

  • Kubernetes Clusters → Internal services routed incorrectly, breaking microservice communications.

  • SaaS Providers → Customer traffic hijacked to malicious endpoints.

  • Supply Chain Risks → Malicious redirection during software updates.

  • Financial Losses → Service downtime, trust erosion, compliance penalties.

 CyberDudeBivash Mitigation Playbook

For Enterprises & DevOps Teams

  1. Patch CoreDNS → Upgrade to 1.11.2 or latest stable release.

  2. Harden Cache Config → Lower TTLs, reject invalid responses.

  3. DNSSEC Validation → Enforce cryptographic validation of DNS records.

  4. Network Monitoring → Alert on sudden DNS record changes.

  5. Segmentation → Isolate CoreDNS from untrusted networks.

For SOC Teams

  • Hunt for anomalies:

    • Unexpected outbound connections.

    • Repeated queries to poisoned domains.

    • Abnormally long TTLs in DNS cache.

 CyberDudeBivash Expert Commentary

This is not just a bug. It’s an attack surface multiplier for adversaries. DNS cache poisoning is as old as Kaminsky’s 2008 exploit, but CoreDNS makes it relevant again in the Kubernetes cloud-native era.

Organizations relying on CoreDNS without Zero Trust DNS are at serious risk. Attackers can weaponize poisoned caches for espionage, ransomware delivery, and persistent DoS.

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 CyberDudeBivash Ecosystem

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#CyberDudeBivash #CoreDNS #CVE #DNSCachePoisoning #ThreatIntel #Kubernetes #ZeroTrust #BreakingThreatIntel #CyberDefense #DNSAttack

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