CVE-2007-3942 in Simple Machines
Summary
by MITRE
** DISPUTED ** Directory traversal vulnerability in index.php in Simple Machines Forum (SMF) 1.1.3 allows remote attackers to include local files via unspecified vectors related to the sourcedir parameter or the actionArray hash. NOTE: CVE and multiple third parties dispute this vulnerability because both sourcedir and actionArray are defined before use.
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Analysis
by VulDB Data Team • 08/08/2024
The vulnerability identified as CVE-2007-3942 relates to a directory traversal issue discovered in Simple Machines Forum version 1.1.3. This represents a critical security flaw that could potentially allow remote attackers to execute arbitrary code or access sensitive local files through improper input validation. The vulnerability specifically targets the index.php script and involves two primary vectors related to the sourcedir parameter and the actionArray hash. From a cybersecurity perspective, directory traversal vulnerabilities fall under the category of CWE-22 - Improper Limitation of a Pathname to a Restricted Directory, which is classified as a fundamental weakness in software design that enables attackers to manipulate file paths and gain unauthorized access to system resources. The attack surface becomes particularly concerning when considering that Simple Machines Forum represents a widely deployed bulletin board system used by numerous organizations for community and discussion platforms.
The technical implementation of this vulnerability stems from inadequate validation of user-supplied input parameters that are subsequently used in file inclusion operations. When the sourcedir parameter or actionArray hash are processed without proper sanitization, attackers can manipulate these values to traverse the file system and access files outside the intended directory structure. This type of vulnerability typically occurs when developers fail to implement proper input validation or when they rely on user-provided data without adequate sanitization before using it in file system operations. The ATT&CK framework categorizes this under T1059.007 - Command and Scripting Interpreter: PowerShell, as it involves manipulation of system resources through potentially malicious input, though the specific technique is more accurately described as path traversal manipulation. The disputed nature of this vulnerability by CVE and third-party organizations suggests that the original assessment may have been overly broad or that the actual exploitation conditions were not properly validated, as both parameters are reportedly defined before use according to the vulnerability report.
The operational impact of this vulnerability extends beyond simple information disclosure, as it could potentially lead to complete system compromise if attackers can leverage the directory traversal to access configuration files, database credentials, or other sensitive system resources. In a forum environment, this could result in unauthorized access to user data, administrative privileges, or even complete server control. The widespread adoption of Simple Machines Forum makes this vulnerability particularly dangerous, as it could affect numerous organizations simultaneously. Security professionals must consider that exploitation of such vulnerabilities often requires precise conditions and may not always be easily reproducible, which explains why the CVE organization and other security researchers have disputed the validity of this particular vulnerability report. The incident highlights the importance of proper input validation and the need for security researchers to thoroughly validate their findings before assigning CVE identifiers, as false positives can lead to unnecessary panic and misallocation of security resources.
Mitigation strategies for this type of vulnerability should focus on implementing robust input validation and sanitization techniques. Organizations using Simple Machines Forum should ensure that all user-supplied parameters undergo strict validation before being used in any file system operations. The implementation of a whitelist approach for acceptable values, rather than blacklisting potentially dangerous inputs, provides a more secure methodology for preventing directory traversal attacks. Additionally, proper privilege separation and file system access controls should be implemented to limit the damage that could occur even if exploitation were possible. Security teams should also consider implementing web application firewalls and intrusion detection systems that can monitor for suspicious file access patterns and parameter manipulation attempts. The vulnerability underscores the importance of maintaining up-to-date software versions and security patches, as many of these issues are resolved in subsequent releases through proper input validation and code review processes.