CVE-2008-6971 in SMF
Summary
by MITRE
The password reset functionality in Simple Machines Forum (SMF) 1.0.x before 1.0.14, 1.1.x before 1.1.6, and 2.0 before 2.0 beta 4 includes clues about the random number generator state within a hidden form field and generates predictable validation codes, which allows remote attackers to modify passwords of other users and gain privileges.
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Analysis
by VulDB Data Team • 11/03/2024
The vulnerability identified as CVE-2008-6971 affects the password reset mechanism in Simple Machines Forum versions prior to specific patches, creating a critical security flaw that enables unauthorized privilege escalation. This issue resides in the random number generation process used for validation codes during password reset operations, where the system's predictable behavior compromises the entire authentication workflow. The flaw specifically impacts SMF 1.0.x versions before 1.0.14, 1.1.x versions before 1.1.6, and 2.0 versions before 2.0 beta 4, representing a widespread vulnerability across multiple major releases of this popular forum software.
The technical implementation of this vulnerability stems from improper entropy management within the password reset functionality. When users initiate a password reset request, the system generates a validation code that should be unpredictable and secure. However, the random number generator state is exposed through a hidden form field, allowing attackers to reconstruct the generation sequence. This exposure creates a scenario where an attacker can calculate future validation codes by analyzing the current state of the random number generator, effectively bypassing the security measures designed to prevent unauthorized password modifications.
The operational impact of this vulnerability is severe and multifaceted, as it enables remote attackers to perform privilege escalation attacks without requiring authentication. An attacker can exploit this weakness to reset passwords for arbitrary user accounts, potentially gaining administrative privileges within the forum system. This capability directly violates fundamental security principles of authentication and authorization, allowing unauthorized individuals to assume legitimate user identities and potentially compromise the entire forum infrastructure. The vulnerability's remote nature means that attackers can exploit it from any location without physical access to the system, making it particularly dangerous for online communities and web applications.
The flaw aligns with CWE-330 Use of Insufficiently Random Values, which specifically addresses weaknesses in cryptographic implementations where insufficient randomness leads to predictable outputs that can be exploited by attackers. This vulnerability also maps to ATT&CK technique T1566.002 for credential access through social engineering, as the predictable validation codes can be used to craft targeted attacks against specific users. Additionally, it represents a violation of the principle of least privilege and proper access control implementation, as the system fails to maintain proper state isolation for security-critical operations.
Mitigation strategies for this vulnerability require immediate patching of affected SMF versions to the patched releases that address the random number generation implementation. Organizations should ensure that all instances of SMF are updated to versions 1.0.14, 1.1.6, or 2.0 beta 4 respectively, depending on their current version. Beyond patching, system administrators should implement additional monitoring for suspicious password reset activities and consider implementing rate limiting on reset requests to prevent automated exploitation attempts. The vulnerability demonstrates the critical importance of proper cryptographic implementation and the necessity of using cryptographically secure random number generators for security-sensitive operations, particularly in authentication mechanisms where predictability can lead to complete system compromise.