CVE-2008-6756 in ZoneMinder
Summary
by MITRE
ZoneMinder 1.23.3 on Gentoo Linux uses 0644 permissions for /etc/zm.conf, which allows local users to obtain the database username and password by reading this file.
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Analysis
by VulDB Data Team • 11/06/2018
The vulnerability identified as CVE-2008-6756 represents a critical privilege escalation and information disclosure weakness within ZoneMinder version 1.23.3 running on Gentoo Linux systems. This flaw stems from improper file permission configuration where the sensitive configuration file /etc/zm.conf is set with world-readable permissions of 0644 instead of more restrictive settings appropriate for system security. The ZoneMinder application is a popular open-source video surveillance software that manages security camera feeds and requires secure handling of database credentials to maintain system integrity and prevent unauthorized access to surveillance data.
The technical nature of this vulnerability resides in the Unix file permission model where the 0644 permission setting grants read access to all users on the system while maintaining write permissions only for the file owner. This misconfiguration allows any local user to execute a simple file read operation to extract database authentication credentials stored within the zm.conf file. The configuration file typically contains database connection parameters including username and password information that would otherwise be protected from unauthorized access. This represents a fundamental failure in principle of least privilege and proper access control implementation within the application deployment.
The operational impact of this vulnerability extends beyond simple credential exposure to encompass potential system compromise and unauthorized surveillance access. Local attackers who gain access to the system through any means can immediately obtain database credentials and potentially escalate their privileges to access the underlying database directly. This exposure could enable attackers to manipulate surveillance records, extract sensitive video data, or even compromise the entire database system. The vulnerability affects all local users on the system regardless of their administrative status, making it particularly dangerous in multi-user environments where users may have varying levels of access but none should possess database credentials.
Security professionals should recognize this vulnerability as a classic example of improper file permissions and privilege management, aligning with CWE-732 and CWE-276 categories that address incorrect permissions and inadequate access control. The issue demonstrates how seemingly minor configuration errors can create significant security risks and highlights the importance of proper file system security practices. From an attack framework perspective, this vulnerability would be categorized under the privilege escalation and credential access phases of the kill chain, potentially enabling further exploitation through lateral movement or persistence mechanisms. Organizations should implement immediate remediation measures including changing file permissions to 0600 or more restrictive settings, ensuring that only the necessary system user can read the configuration file while maintaining appropriate ownership and group permissions.
The remediation process for this vulnerability requires system administrators to modify the file permissions of /etc/zm.conf to restrict access to the file owner only, typically accomplished through commands such as chown and chmod operations. Additionally, regular security audits should verify that no other sensitive configuration files maintain overly permissive settings, and automated monitoring systems should be implemented to detect unauthorized changes to critical system files. This vulnerability underscores the importance of following security best practices such as the principle of least privilege, proper file system access controls, and regular security assessments to prevent similar issues from compromising system security. Organizations should also consider implementing additional security controls such as file integrity monitoring and access logging to detect potential exploitation attempts and maintain audit trails for security investigations.