CVE-2008-5434 in PunBB
Summary
by MITRE
Multiple SQL injection vulnerabilities in PunBB 1.3 and 1.3.1 allow remote authenticated administrators to execute arbitrary SQL commands via the (1) order_by or (2) direction parameter to admin/users.php, or (3) configuration options to admin/settings.php.
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Analysis
by VulDB Data Team • 10/22/2018
The vulnerability identified as CVE-2008-5434 represents a critical SQL injection flaw affecting PunBB versions 1.3 and 1.3.1, specifically targeting authenticated administrative users with elevated privileges. This vulnerability resides within the administrative interfaces of the forum software, creating a pathway for malicious actors to execute arbitrary SQL commands against the underlying database system. The flaw manifests through three distinct attack vectors that exploit improper input validation within the administrative control panel, making it particularly dangerous as it requires only administrative access rather than full system compromise. The vulnerability directly maps to CWE-89, which categorizes SQL injection as a fundamental weakness in data validation and input sanitization, and aligns with ATT&CK technique T1071.004 for application layer protocol manipulation.
The technical implementation of this vulnerability occurs when administrators interact with specific administrative pages, namely admin/users.php and admin/settings.php. In the first vector, the order_by and direction parameters in admin/users.php fail to properly sanitize user input, allowing attackers to inject malicious SQL payloads that get executed within the database context. The second vector targets configuration options within admin/settings.php, where similar input validation failures permit SQL injection attacks. These parameters are processed without adequate filtering or escaping mechanisms, enabling attackers to manipulate database queries through carefully crafted input sequences. The authentication requirement significantly reduces the attack surface but does not eliminate the risk, as compromise of administrative credentials can lead to complete database exposure.
The operational impact of this vulnerability extends far beyond simple data theft, as successful exploitation allows attackers to execute arbitrary database commands with the privileges of the database user account. This capability enables comprehensive database enumeration, data modification, deletion of critical forum data, and potentially access to other systems if the database server hosts additional applications. Attackers could leverage this vulnerability to escalate privileges within the database, extract sensitive user information including passwords stored in plain text or weakly hashed formats, and even modify forum configurations to redirect users to malicious sites. The implications are particularly severe for organizations relying on PunBB for community forums, as the compromise of administrative accounts can result in complete service disruption and data loss.
Mitigation strategies for CVE-2008-5434 must address both immediate remediation and long-term security hardening. The primary solution involves upgrading to patched versions of PunBB that properly implement input validation and parameterized queries for all administrative interfaces. Organizations should implement proper input sanitization techniques including parameterized queries, prepared statements, and proper escaping of special characters in database interactions. Network segmentation and privileged account protection measures including multi-factor authentication should be enforced to limit the impact of credential compromise. Regular security auditing of administrative interfaces and input validation mechanisms should be conducted to prevent similar vulnerabilities from emerging in future code releases. The vulnerability demonstrates the critical importance of validating all user inputs within administrative interfaces, particularly when these interfaces operate with elevated privileges, and underscores the necessity of following secure coding practices as outlined in OWASP Top Ten and NIST cybersecurity guidelines.