CVE-2008-4163 in BIND
Summary
by MITRE
Unspecified vulnerability in ISC BIND 9.3.5-P2-W1, 9.4.2-P2-W1, and 9.5.0-P2-W1 on Windows allows remote attackers to cause a denial of service (UDP client handler termination) via unknown vectors.
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Analysis
by VulDB Data Team • 08/17/2019
The vulnerability identified as CVE-2008-4163 affects ISC BIND versions 9.3.5-P2-W1, 9.4.2-P2-W1, and 9.5.0-P2-W1 running on Windows platforms, representing a critical denial of service weakness that can be exploited remotely by attackers. This issue specifically targets the UDP client handler component within the BIND DNS server implementation, creating a condition where legitimate DNS service operations can be disrupted through unspecified attack vectors. The vulnerability falls under the broader category of software flaws that can compromise system availability and service integrity, making it particularly dangerous in production environments where continuous DNS service availability is paramount for network operations.
The technical flaw manifests in the Windows-specific implementation of BIND's UDP client handler, which fails to properly manage certain incoming DNS query patterns or malformed packets that trigger unexpected termination of the UDP processing thread. This behavior aligns with common software design patterns where input validation or error handling mechanisms are insufficient to process malformed or unexpected network traffic. The vulnerability demonstrates characteristics similar to those classified under CWE-129 Input Validation and CWE-20 Improper Input Validation, where insufficient validation of external inputs leads to system instability. The root cause likely involves inadequate boundary checking or state management within the UDP packet processing pipeline, causing the service to crash or terminate when encountering specific packet sequences that were not anticipated during the development phase.
The operational impact of this vulnerability extends beyond simple service disruption, as DNS servers form the backbone of internet infrastructure and network operations. When a BIND server becomes unavailable due to this vulnerability, it can cascade into widespread service outages affecting multiple dependent systems that rely on DNS resolution for their operations. Network administrators may experience significant downtime while attempting to restore services, particularly in environments where automated failover mechanisms are not properly configured. The vulnerability's remote exploitability means that attackers do not require physical access or local network presence to cause disruption, making it particularly concerning for publicly accessible DNS servers. This weakness can be leveraged by attackers to perform service denial attacks that can be difficult to distinguish from legitimate network issues, potentially masking more sophisticated attacks or causing unintended operational disruption.
Mitigation strategies for CVE-2008-4163 should prioritize immediate patch application from ISC, as the vulnerability represents an unpatched security flaw that attackers can readily exploit. Organizations should implement network segmentation and access controls to limit exposure of vulnerable BIND installations to untrusted networks, while also deploying intrusion detection systems that can monitor for unusual DNS query patterns that may indicate exploitation attempts. The remediation process should include thorough testing of patched versions in controlled environments before deployment to production systems to ensure that updates do not introduce compatibility issues with existing network configurations. Additionally, implementing monitoring solutions that can detect UDP client handler termination events and alert administrators to potential exploitation attempts provides an additional layer of defense. Security teams should also consider implementing rate limiting and query validation mechanisms as temporary measures while full patches are deployed, following the principle of least privilege and defense in depth as outlined in the MITRE ATT&CK framework for network service attacks.