CVE-2017-2140 in Explorer
Summary
by MITRE
Tablacus Explorer 17.3.30 and earlier allows arbitrary scripts to be executed in the context of the application due to specially crafted directory.
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Analysis
by VulDB Data Team • 09/22/2020
Tablacus Explorer represents a popular open-source file manager for windows systems that provides enhanced functionality beyond standard explorer capabilities. The vulnerability identified in version 17.3.30 and earlier stems from insufficient input validation within the application's directory handling mechanisms. This flaw allows malicious actors to craft specially formatted directory names that, when processed by the application, trigger unintended script execution within the application's security context.
The technical nature of this vulnerability aligns with common software security weaknesses categorized under CWE-74 as "Improper Neutralization of Special Elements in Output Used by a Downstream Component." The application fails to properly sanitize directory names that contain special characters or sequences that could be interpreted as executable commands or script triggers. When users navigate to or interact with these maliciously crafted directory paths, the application processes them without adequate security controls, potentially executing arbitrary code with the privileges of the running Tablacus Explorer process.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a potential foothold for more sophisticated attacks within the target system. Since Tablacus Explorer typically runs with the privileges of the logged-in user, successful exploitation could lead to privilege escalation if the user has elevated permissions, or provide access to sensitive data and system resources. The vulnerability is particularly concerning because it can be triggered through normal file system navigation operations, making it difficult for users to recognize when they are encountering malicious content.
Security professionals should note that this vulnerability demonstrates the importance of input validation and proper sanitization of user-supplied data in file system applications. The ATT&CK framework categorizes this type of vulnerability under T1059 as "Command and Scripting Interpreter," where adversaries execute malicious code through legitimate system tools. Organizations using Tablacus Explorer should immediately update to versions 17.3.31 and later, which contain patches addressing this specific directory handling flaw. Additionally, system administrators should implement monitoring for unusual directory creation patterns and consider restricting user privileges when interacting with file management applications to limit potential damage from such exploits.