CVE-2006-0865 in PunBB
Summary
by MITRE
PunBB 1.2.10 and earlier allows remote attackers to cause a denial of service (resource consumption) by registering many user accounts quickly.
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Analysis
by VulDB Data Team • 06/08/2025
The vulnerability described in CVE-2006-0865 represents a classic resource exhaustion attack vector that specifically targets the PunBB bulletin board system version 1.2.10 and earlier. This issue stems from inadequate input validation and account creation controls within the application's user registration mechanism, creating a pathway for malicious actors to consume system resources through rapid account proliferation. The flaw manifests when an attacker exploits the lack of rate limiting or account validation checks during the registration process, allowing them to flood the system with numerous user accounts in quick succession.
This vulnerability operates under the broader category of resource exhaustion attacks and can be classified under CWE-400, which addresses "Uncontrolled Resource Consumption" in software systems. The technical implementation flaw lies in the absence of proper rate limiting mechanisms within the PunBB registration functionality, combined with insufficient validation of registration requests. When multiple accounts are created rapidly, the system's database operations, memory allocation, and processing resources become overwhelmed, leading to the denial of service condition where legitimate users cannot access the system or create accounts.
The operational impact of this vulnerability extends beyond simple service disruption to encompass potential system instability and performance degradation. Attackers can leverage this weakness to consume database connections, memory resources, and processing power, effectively rendering the bulletin board system unusable for legitimate users. The attack vector requires minimal technical expertise and can be executed through automated scripts, making it particularly dangerous in environments where the system lacks proper monitoring or rate limiting controls. The vulnerability affects the availability aspect of the CIA triad, specifically targeting the system's ability to provide services to authorized users.
Mitigation strategies for this vulnerability should focus on implementing robust rate limiting mechanisms at the application level, establishing account creation throttling controls, and deploying automated monitoring systems to detect unusual registration patterns. Organizations should implement account validation processes that require email confirmation or CAPTCHA verification to prevent automated account creation. The solution aligns with ATT&CK technique T1499.004, which covers "Toggle System Defense" through resource exhaustion attacks, and should be addressed through proper application hardening and defensive programming practices. System administrators should also configure appropriate logging and alerting mechanisms to detect potential abuse of the registration functionality, while considering implementing IP-based rate limiting and account verification workflows to prevent unauthorized resource consumption.