CVE-2010-3486 in SmarterMail
Summary
by MITRE
Directory traversal vulnerability in FileStorageUpload.ashx in SmarterMail 7.1.3876 allows remote attackers to read arbitrary files via a (1) ../ (dot dot slash), (2) %5C (encoded backslash), or (3) %255c (double-encoded backslash) in the name parameter.
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Analysis
by VulDB Data Team • 08/13/2024
The vulnerability identified as CVE-2010-3486 represents a critical directory traversal flaw within the FileStorageUpload.ashx component of SmarterMail version 7.1.3876. This weakness stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data, specifically the name parameter used in file upload operations. The vulnerability manifests when attackers exploit improper path handling by injecting malicious sequences that manipulate the file system navigation logic.
The technical exploitation of this vulnerability leverages three distinct attack vectors that all achieve the same malicious outcome of directory traversal. The first vector employs the standard dot dot slash notation ../ which attempts to navigate up the directory hierarchy. The second vector utilizes the encoded backslash %5C, while the third employs double encoding %255c to bypass basic sanitization checks. These techniques demonstrate a sophisticated understanding of how different encoding schemes can be used to circumvent security controls, representing a classic example of bypassing input validation mechanisms that should have prevented such path manipulation attempts.
This vulnerability directly maps to CWE-22, which defines the weakness of Improper Limitation of a Pathname to a Restricted Directory, commonly known as directory traversal or path traversal attacks. The flaw allows remote attackers to access files outside the intended directory structure, potentially exposing sensitive system information, configuration files, or even system binaries. The impact extends beyond simple information disclosure to include potential system compromise, as attackers could access critical system resources or inject malicious code through the upload functionality.
The operational consequences of this vulnerability are severe for organizations relying on SmarterMail for email services. Attackers could potentially access email archives, user credentials stored in configuration files, system logs, or other sensitive data that should remain isolated within the application's designated directories. The remote nature of the attack means that exploitation does not require physical access to the system, making it particularly dangerous for web-based applications. This vulnerability also aligns with ATT&CK technique T1083, which covers the discovery of system information through directory traversal attacks, and T1190, which covers the exploitation of vulnerabilities in web applications.
Organizations should implement immediate mitigations including input validation that properly sanitizes all user-supplied parameters, particularly those used in file operations. The recommended approach involves implementing strict path validation that rejects any input containing directory traversal sequences, regardless of encoding. Additionally, the application should enforce proper access controls and implement a least privilege model where file upload operations are restricted to specific directories with appropriate permissions. System administrators should also consider implementing web application firewalls to detect and block malicious requests containing traversal sequences. The vulnerability highlights the critical importance of validating all user inputs and demonstrates how seemingly simple flaws in path handling can lead to significant security breaches, emphasizing the need for comprehensive security testing and adherence to secure coding practices throughout the software development lifecycle.