CVE-2008-6506 in phpBB
Summary
by MITRE
Unspecified vulnerability in phpBB before 3.0.4 allows attackers to bypass intended access restrictions and activate de-activated accounts via unknown vectors.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 11/03/2018
The vulnerability identified as CVE-2008-6506 represents a critical access control flaw within the phpBB bulletin board system prior to version 3.0.4. This unspecified weakness in the authentication and authorization mechanisms allowed malicious actors to circumvent intended security restrictions that were designed to prevent unauthorized account activation. The vulnerability specifically targeted the account management functionality where de-activated accounts could be reactivated through unknown attack vectors that bypassed the normal validation processes.
This security defect falls under the category of privilege escalation and access control bypass vulnerabilities, which are classified under CWE-284 in the Common Weakness Enumeration framework. The vulnerability demonstrates a fundamental flaw in the software's permission model where the system failed to properly validate account states during activation requests. Attackers could exploit this weakness to reactivate accounts that had been intentionally disabled by administrators, potentially allowing unauthorized access to restricted forums and user data.
The operational impact of this vulnerability extends beyond simple account activation, as it could enable attackers to gain unauthorized access to forum content, user communications, and potentially escalate their privileges within the system. The unspecified nature of the attack vectors suggests that multiple pathways existed for exploitation, making the vulnerability particularly dangerous as defenders could not easily predict or patch specific attack methods. This weakness would have been especially damaging in environments where phpBB was used for sensitive communications or where account deactivation was a standard security measure.
The vulnerability aligns with several techniques documented in the MITRE ATT&CK framework under the privilege escalation and defense evasion tactics. Specifically, it relates to techniques involving bypassing access controls and compromising account integrity. Organizations using affected versions of phpBB would have been at risk of unauthorized account takeover, data exposure, and potential lateral movement within their network infrastructure. The attack surface was broadened as the vulnerability could be exploited by both authenticated and unauthenticated users depending on the specific implementation details.
Mitigation strategies for this vulnerability required immediate upgrade to phpBB version 3.0.4 or later, which contained the necessary patches to address the access control bypass. System administrators should have implemented comprehensive monitoring of account activation events and established robust audit trails to detect unauthorized reactivations. Additional security measures included implementing strong account management policies, regular security assessments of forum configurations, and ensuring proper access controls were in place at the network level. The vulnerability highlighted the importance of timely patch management and proper security testing of authentication mechanisms in web applications.