CVE-2016-7843 in AttacheCase for Java
Summary
by MITRE
Directory traversal vulnerability in AttacheCase for Java 0.60 and earlier, AttacheCase Lite 1.4.6 and earlier, and AttacheCase Pro 1.5.7 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 directory traversal vulnerability identified as CVE-2016-7843 affects multiple versions of AttacheCase software including the standard edition 0.60 and earlier, AttacheCase Lite 1.4.6 and earlier, and AttacheCase Pro 1.5.7 and earlier. This vulnerability represents a critical security flaw that enables remote attackers to access arbitrary files on the affected systems through manipulation of ATC file structures. The vulnerability stems from insufficient input validation and improper handling of file paths during the processing of attachment files, creating an exploitable condition that can be leveraged for unauthorized data access.
The technical implementation of this vulnerability resides in the way AttacheCase handles file path resolution when processing ATC files. Attackers can craft specially formatted ATC files that contain directory traversal sequences such as "../" or "..\\" to navigate outside the intended directory structure. This flaw falls under the CWE-22 category of Improper Limitation of a Pathname to a Restricted Directory, commonly known as Path Traversal. The vulnerability exists because the software fails to properly sanitize or validate file paths before using them in file system operations, allowing attackers to bypass access controls and retrieve sensitive files from the server's file system.
The operational impact of this vulnerability is severe and multifaceted, particularly in environments where AttacheCase is used for document management and file attachment services. Remote attackers can potentially access confidential business documents, system configuration files, database files, and other sensitive data that should remain protected. The vulnerability enables attackers to read files from arbitrary locations on the server, potentially including system files, application files, and user data. This access can lead to information disclosure, system compromise, and potential further exploitation through the exposure of system internals or credentials stored in accessible files.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, specifically under the T1083 technique for File and Directory Discovery, and potentially T1566 for Phishing with Malicious Attachments. The attack chain typically involves an attacker sending a malicious ATC file to a victim, which when processed by the vulnerable AttacheCase software triggers the directory traversal exploit. Organizations should implement immediate mitigations including patching to the latest versions of AttacheCase software, implementing proper input validation for file paths, and restricting file attachment capabilities to trusted sources only. Network segmentation and monitoring for suspicious file access patterns can also help detect and prevent exploitation attempts. Additionally, the principle of least privilege should be enforced to limit the damage potential even if exploitation occurs, and regular security assessments should verify that no other similar vulnerabilities exist in the software ecosystem.