CVE-2001-0012 in BIND
Summary
by MITRE
BIND 4 and BIND 8 allow remote attackers to access sensitive information such as environment variables.
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Analysis
by VulDB Data Team • 05/07/2019
The vulnerability identified as CVE-2001-0012 affects the Berkeley Internet Name Domain software versions 4 and 8, representing a critical information disclosure flaw that enables remote attackers to extract sensitive environment variables from affected systems. This vulnerability stems from improper handling of certain query responses within the BIND implementation, specifically when processing requests that trigger the retrieval of system information. The flaw exists in the authoritative name server functionality where the software fails to properly sanitize or restrict access to internal system parameters during query processing.
The technical exploitation of this vulnerability occurs through carefully crafted DNS queries that cause the BIND server to return environment variable contents in its response packets. This occurs because the software does not adequately validate or filter the data returned during certain operational modes, particularly when serving authoritative data or handling specific error conditions. The flaw is classified under CWE-200, which addresses the exposure of sensitive information, and represents a classic case of information leakage through improper output handling. Attackers can leverage this weakness to gather system configuration details, user credentials, or other sensitive data that may be embedded within environment variables, potentially compromising system security posture.
From an operational impact perspective, this vulnerability creates significant risk for organizations relying on BIND 4 and 8 servers for DNS services. The exposure of environment variables can reveal critical system information including paths to executables, configuration file locations, database connection strings, and potentially authentication tokens. This information can then be used by attackers to plan more sophisticated attacks or to identify additional vulnerabilities within the system. The vulnerability aligns with ATT&CK technique T1082, which focuses on system information discovery, and T1552, which covers credentials harvesting through information discovery. The remote nature of the exploit means that attackers can leverage this vulnerability from outside the network perimeter without requiring local system access or prior authentication.
Mitigation strategies for CVE-2001-0012 primarily involve immediate software updates to newer versions of BIND that address the information disclosure flaw. Organizations should implement network segmentation and access controls to limit exposure of DNS servers to untrusted networks, while also considering the deployment of DNS firewalls or intrusion detection systems that can monitor for suspicious query patterns. Additionally, regular security assessments should be conducted to identify and remediate similar information disclosure vulnerabilities in other network services. The vulnerability demonstrates the importance of proper input validation and output sanitization in network services, and serves as a reminder of the critical need for regular security updates and vulnerability management processes. Organizations should also implement monitoring for unusual DNS query patterns that might indicate exploitation attempts, as this information disclosure vulnerability can be used as a reconnaissance tool to gather intelligence for more advanced attacks.