CVE-2000-0054 in Home Free
Summary
by MITRE
search.cgi in the SolutionScripts Home Free package allows remote attackers to view directories via a .. (dot dot) attack.
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Analysis
by VulDB Data Team • 08/22/2024
The vulnerability identified as CVE-2000-0054 resides within the search.cgi script of the SolutionScripts Home Free package, representing a classic directory traversal flaw that has persisted as a fundamental security weakness in web applications. This vulnerability specifically affects the handling of user-supplied input within the search functionality, where the application fails to properly validate or sanitize directory paths before processing them. The flaw enables malicious actors to manipulate the script's behavior by injecting directory traversal sequences using the .. (dot dot) notation, which is a well-documented technique for accessing files and directories outside the intended scope of the application. The vulnerability operates at the application level and represents a type of path traversal attack that falls under the broader category of insecure direct object references.
The technical implementation of this vulnerability stems from the script's inadequate input validation mechanisms and improper sanitization of user-provided parameters. When a user submits a search query through the search.cgi interface, the application processes the input without sufficient checks to prevent directory traversal sequences from being interpreted as legitimate path components. The .. (dot dot) attack pattern allows attackers to navigate up directory levels in the file system hierarchy, potentially accessing sensitive files such as configuration files, password databases, or other system resources that should remain inaccessible to unauthorized users. This vulnerability directly maps to CWE-22, which defines the weakness of improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The flaw essentially allows the application to interpret user input as a series of directory navigation commands rather than as simple search terms.
The operational impact of CVE-2000-0054 extends beyond simple information disclosure, as it provides attackers with the ability to potentially access sensitive system files and data. Remote attackers can leverage this vulnerability to enumerate directory structures, access restricted files, and potentially gain unauthorized access to system resources that should be protected. The attack can be executed from any remote location without requiring authentication, making it particularly dangerous as it can be exploited by anyone who can access the vulnerable web application. This type of vulnerability can lead to complete system compromise when combined with other attack vectors, as it may provide attackers with access to critical system information, configuration files, or even executable code that could be used to escalate privileges. The vulnerability also aligns with ATT&CK technique T1083, which covers directory and file permissions enumeration, as attackers can use this flaw to discover and access unauthorized directories and files within the application's file system.
Mitigation strategies for this vulnerability must address both the immediate security gap and prevent similar issues from occurring in future implementations. The most effective immediate solution involves implementing proper input validation and sanitization for all user-supplied parameters, particularly those that may be used in file system operations. The application should reject or encode any input containing directory traversal sequences such as .. or %2e%2e. Additionally, implementing a whitelist approach for valid input parameters and ensuring that all file operations occur within predefined, restricted directories can prevent unauthorized access. The solution should also include proper access controls and privilege separation to ensure that even if traversal occurs, the attacker cannot access sensitive system resources. Organizations should also implement regular security testing, including dynamic application security testing and static code analysis, to identify similar vulnerabilities in other applications. The remediation process should also include proper logging and monitoring of file system access patterns to detect potential exploitation attempts. This vulnerability serves as a reminder of the critical importance of input validation in web applications and demonstrates how seemingly simple flaws can have significant security implications. The vulnerability highlights the necessity of following secure coding practices and adhering to established security frameworks such as the OWASP Top Ten to prevent common web application vulnerabilities.