CVE-2009-4022 in BIND
Summary
by MITRE
Unspecified vulnerability in ISC BIND 9.0.x through 9.3.x, 9.4 before 9.4.3-P4, 9.5 before 9.5.2-P1, 9.6 before 9.6.1-P2, and 9.7 beta before 9.7.0b3, with DNSSEC validation enabled and checking disabled (CD), allows remote attackers to conduct DNS cache poisoning attacks by receiving a recursive client query and sending a response that contains an Additional section with crafted data, which is not properly handled when the response is processed "at the same time as requesting DNSSEC records (DO)," aka Bug 20438.
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Analysis
by VulDB Data Team • 12/08/2024
The vulnerability described in CVE-2009-4022 represents a critical flaw in the Internet Systems Consortium BIND DNS server software that affects multiple versions from 9.0.x through 9.7 beta releases. This issue specifically manifests when DNSSEC validation is enabled alongside the checking disabled (CD) flag, creating a condition where remote attackers can exploit the DNS cache poisoning mechanism through carefully crafted responses. The vulnerability stems from improper handling of DNS response packets that contain an Additional section with malicious data, which becomes exploitable during the processing of DNSSEC records when the DO (DNSSEC OK) flag is present. This particular attack vector leverages the interaction between DNSSEC validation and cache management processes within the BIND server implementation.
The technical exploitation of this vulnerability occurs through a specific sequence of operations involving recursive DNS queries and response processing. When a client sends a recursive query to a vulnerable BIND server with DNSSEC validation enabled and the CD flag set, the server processes this request while simultaneously attempting to retrieve DNSSEC records. Attackers can manipulate the Additional section of DNS responses to inject malicious data that the server fails to properly validate or sanitize. This flaw falls under the CWE-129 weakness category, which encompasses improper validation of array indices and buffer overflows, as the server's handling of the Additional section data does not properly validate the bounds or content of the received information. The vulnerability specifically relates to the DNS protocol implementation where the server's response processing logic does not adequately distinguish between legitimate and malicious data within the DNS packet structure.
The operational impact of this vulnerability extends beyond simple cache poisoning, potentially allowing attackers to redirect DNS traffic to malicious servers, intercept communications, or perform more sophisticated attacks such as man-in-the-middle operations. The attack can be particularly dangerous in environments where DNSSEC is enabled for security purposes, as the vulnerability specifically targets the validation mechanisms designed to protect against such attacks. The fact that this vulnerability affects multiple versions of BIND across different release branches indicates a fundamental flaw in the codebase rather than a simple patchable issue. The presence of this vulnerability creates a situation where even systems that have implemented DNSSEC validation can be compromised, undermining the security assumptions that organizations place in their DNS infrastructure. This vulnerability is classified under the ATT&CK technique T1071.004 for Application Layer Protocol: DNS, where adversaries use DNS to communicate with compromised systems or to perform reconnaissance and attack delivery.
Mitigation strategies for CVE-2009-4022 require immediate patching of affected BIND versions to the latest stable releases that contain the specific fixes for this vulnerability. Organizations should upgrade to BIND 9.4.3-P4, 9.5.2-P1, 9.6.1-P2, or 9.7.0b3 and later versions where the issue has been addressed through proper validation of Additional section data during DNSSEC record processing. Network administrators should also consider implementing additional monitoring for suspicious DNS traffic patterns and implementing proper DNS security measures such as DNS Firewall rules that can detect and block malformed DNS responses. The vulnerability demonstrates the importance of proper input validation in DNS servers and the need for comprehensive testing of security features like DNSSEC when they interact with core DNS processing functions. Organizations should also review their DNSSEC configurations to ensure that they are not inadvertently enabling conditions that make them susceptible to this type of attack, particularly when dealing with recursive DNS servers that may be exposed to untrusted networks.