CVE-2008-3072 in Simple Machines
Summary
by MITRE
Simple Machines Forum (SMF) 1.1.x before 1.1.5 and 1.0.x before 1.0.13, when running in PHP before 4.2.0, does not properly seed the random number generator, which has unknown impact and attack vectors.
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Analysis
by VulDB Data Team • 09/27/2018
The vulnerability identified as CVE-2008-3072 affects Simple Machines Forum versions prior to 1.1.5 and 1.0.13, specifically when operating under PHP versions before 4.2.0. This issue stems from inadequate random number generator seeding practices within the forum software's cryptographic operations. The flaw represents a significant weakness in the application's security infrastructure, particularly concerning its ability to generate unpredictable values for critical security functions. The vulnerability manifests when the underlying PHP environment lacks proper entropy sources for random number generation, creating predictable sequences that adversaries can potentially exploit. This weakness directly impacts the forum's ability to maintain secure session management, password generation, and other cryptographic operations that depend on quality randomness. The lack of proper seeding means that the random number generator produces sequences that are deterministic or easily guessable, undermining the security of various protection mechanisms within the forum software.
The technical implementation flaw lies in how SMF handles random number generation for cryptographic purposes within its PHP environment. When PHP versions before 4.2.0 are used, the system fails to adequately initialize the random number generator with sufficient entropy, resulting in predictable output sequences. This weakness is particularly concerning because random number generation is fundamental to cryptographic security in web applications, where unpredictable values are essential for maintaining session integrity, generating secure tokens, and creating robust password hashes. The vulnerability creates opportunities for attackers to predict or reproduce random values used by the forum, potentially leading to session hijacking, credential compromise, or other malicious activities that exploit the predictability of the underlying random number generation process. This issue aligns with CWE-330, which specifically addresses the use of insufficiently random values in security contexts, and represents a classic example of poor entropy management in cryptographic implementations.
The operational impact of this vulnerability extends beyond simple predictability issues, as it creates multiple attack vectors that could compromise the entire forum infrastructure. Adversaries could potentially exploit the predictable random number sequences to forge session tokens, guess administrative credentials, or manipulate security-sensitive operations within the forum. The vulnerability's impact is particularly severe when considering that Simple Machines Forum serves as a widely deployed bulletin board system, making it a prime target for exploitation. The unknown attack vectors mentioned in the original description suggest that the full scope of potential exploitation methods remains unclear, but the fundamental weakness in random number generation creates a foundation for various sophisticated attacks. This vulnerability effectively undermines the cryptographic security assumptions that the forum relies upon for protecting user data and maintaining system integrity, potentially allowing unauthorized access to administrative functions and sensitive forum content. The issue demonstrates how seemingly minor implementation details in random number generation can have cascading security implications throughout an entire application ecosystem.
Mitigation strategies for this vulnerability require immediate attention to both software and environmental factors. The primary recommendation involves upgrading to SMF versions 1.1.5 or later for 1.1.x releases, and 1.0.13 or later for 1.0.x releases, which contain fixes for the random number generator seeding issue. Additionally, system administrators should ensure that the underlying PHP environment operates with versions 4.2.0 or higher, where proper random number generation capabilities are available. The upgrade process should include thorough testing to verify that the new versions maintain compatibility with existing forum configurations and custom modifications. Organizations should also implement monitoring systems to detect potential exploitation attempts and consider implementing additional security controls such as stronger session management, rate limiting, and enhanced access controls. The vulnerability highlights the importance of maintaining up-to-date software components and proper entropy sources in cryptographic implementations. From an ATT&CK framework perspective, this vulnerability could enable initial access through session hijacking and privilege escalation through administrative credential compromise, making it a critical target for remediation in any security hardening program.