CVE-2016-7842 in AttacheCase
Summary
by MITRE
Directory traversal vulnerability in AttacheCase 2.8.2.8 and earlier and 3.2.0.4 and earlier allows remote attackers to read arbitrary files via specially crafted ATC file.
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Analysis
by VulDB Data Team • 12/21/2020
The CVE-2016-7842 vulnerability represents a critical directory traversal flaw affecting AttacheCase versions 2.8.2.8 and earlier, as well as 3.2.0.4 and earlier. This vulnerability resides in the file handling mechanisms of the AttacheCase application, which is commonly used for managing and processing email attachments within enterprise environments. The flaw allows remote attackers to exploit the application's inability to properly validate file paths when processing specially crafted ATC files, enabling unauthorized access to arbitrary files on the underlying system. The vulnerability stems from insufficient input validation and improper path resolution within the application's attachment processing pipeline, creating a pathway for attackers to navigate beyond the intended directory boundaries.
The technical exploitation of this vulnerability occurs through the manipulation of ATC file structures, which are used by AttacheCase to store and manage email attachments. When the application processes these files, it fails to adequately sanitize the file paths contained within them, allowing attackers to inject malicious path sequences such as ../ or ..\ that traverse up the directory tree. This flaw directly maps to CWE-22, which defines path traversal vulnerabilities as weaknesses that occur when an application allows user-controllable input to influence file system access. The vulnerability exists at the application layer where file path resolution occurs, making it particularly dangerous as it can be exploited remotely without requiring local system access. Attackers can leverage this weakness to access sensitive files including configuration data, user credentials, database files, and other system resources that should remain protected from unauthorized access.
The operational impact of CVE-2016-7842 extends beyond simple information disclosure, as it can enable attackers to gain access to critical system resources and potentially escalate their privileges within the affected environment. Organizations using AttacheCase may find their email attachment processing systems compromised, leading to potential data breaches, system compromise, and unauthorized access to confidential information. The vulnerability affects the confidentiality and integrity of the system as attackers can read files that contain sensitive data, potentially including passwords, private keys, and other security-sensitive information. From an attack perspective, this vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1005 (Data from Local System), as it enables adversaries to enumerate and extract files from the target system. The remote nature of the exploit means that attackers can leverage this vulnerability from outside the network perimeter, making it particularly dangerous for organizations that do not properly segment their email processing systems.
Mitigation strategies for CVE-2016-7842 should focus on immediate patching of the affected AttacheCase versions to the latest available releases that address the directory traversal vulnerability. Organizations should implement strict input validation and sanitization for all file processing operations, particularly those involving user-supplied data or external file formats. Network segmentation and access controls should be enforced to limit the exposure of AttacheCase systems to untrusted networks. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other applications and systems. Additionally, implementing proper file system permissions and access controls can help limit the damage if exploitation occurs, while maintaining comprehensive logging and monitoring to detect unauthorized file access attempts. The vulnerability underscores the importance of secure coding practices and proper input validation, particularly when handling file paths and user-controllable data within enterprise applications.