CVE-2008-1553 in TopperMod
Summary
by MITRE
Directory traversal vulnerability in mod.php in TopperMod 1.0 allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the to parameter.
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Analysis
by VulDB Data Team • 10/20/2024
The vulnerability identified as CVE-2008-1553 represents a critical directory traversal flaw within the mod.php component of TopperMod version 1.0. This security weakness resides in the application's handling of user-supplied input parameters, specifically the to parameter that controls file inclusion operations. The vulnerability enables remote attackers to manipulate the application's file access mechanisms by exploiting improper input validation and sanitization practices. The flaw allows adversaries to navigate outside the intended directory structure and access arbitrary local files on the server, potentially leading to unauthorized data exposure, system compromise, or complete server takeover.
The technical implementation of this vulnerability stems from inadequate input validation within the mod.php script where the to parameter is directly used in file inclusion operations without proper sanitization or path validation. When an attacker supplies a path containing .. (dot dot) sequences in the to parameter, the application fails to properly resolve or sanitize these path traversal sequences, allowing the attacker to access files outside the intended directory scope. This type of vulnerability falls under the CWE-22 category, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability demonstrates a classic lack of input validation and proper file access controls that violates fundamental security principles of least privilege and input sanitization.
Operationally, the impact of this vulnerability extends beyond simple information disclosure to encompass full system compromise capabilities. An attacker can leverage this weakness to access sensitive system files, configuration data, database credentials, or application source code that may contain additional vulnerabilities. The remote nature of the attack means that exploitation does not require local system access, making it particularly dangerous as it can be exploited from anywhere on the internet. This vulnerability directly maps to several ATT&CK techniques including T1059 for command and scripting interpreter and T1566 for credential access through exploitation of remote services. The attack surface is broad since the vulnerability affects any system running the vulnerable TopperMod version, and the exploitation requires minimal technical expertise, making it attractive to both automated attacks and skilled adversaries.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements. The most direct fix involves implementing proper input validation and sanitization on all user-supplied parameters, particularly those used in file operations. This includes validating that input parameters do not contain path traversal sequences, implementing proper path normalization, and using allow-list validation for acceptable file paths. Organizations should also implement proper file access controls and ensure that applications run with minimal necessary privileges. The principle of least privilege should be enforced, where applications should only have access to files and directories required for their operation. Additionally, regular security audits and code reviews should be conducted to identify similar vulnerabilities in other components, as path traversal flaws often occur in multiple locations within applications. The vulnerability serves as a reminder of the critical importance of input validation and proper file access controls in preventing remote code execution and unauthorized file access scenarios that can lead to complete system compromise.