CVE-2017-2146 in Garoon
Summary
by MITRE
Cross-site scripting vulnerability in Cybozu Garoon 3.0.0 to 4.2.4 allows remote attackers to inject arbitrary web script or HTML via application menu.
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Analysis
by VulDB Data Team • 10/24/2019
The vulnerability identified as CVE-2017-2146 represents a critical cross-site scripting flaw within Cybozu Garoon versions 3.0.0 through 4.2.4. This weakness resides in the application menu component where user input is not properly sanitized before being rendered back to web browsers. The vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically classified as reflected XSS due to the malicious script being injected through user-controllable input fields within the application menu interface. Attackers can exploit this vulnerability by crafting malicious payloads that get executed when other users view the affected menu elements, making it particularly dangerous in collaborative environments where multiple users interact with shared applications.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding mechanisms within the Garoon application menu processing logic. When users interact with menu items or enter data into menu-related fields, the system fails to properly escape or filter special characters that could be interpreted as HTML or JavaScript code. This allows remote attackers to inject malicious scripts that execute in the context of other users' browsers, potentially leading to session hijacking, data theft, or further exploitation of the compromised user accounts. The vulnerability is particularly concerning because it affects the core menu functionality that users interact with regularly, increasing the attack surface and potential impact.
The operational impact of CVE-2017-2146 extends beyond simple script execution, as it can enable attackers to perform sophisticated attacks such as credential theft, session manipulation, and data exfiltration. In enterprise environments where Cybozu Garoon is used for collaboration and document management, successful exploitation could lead to unauthorized access to sensitive business information, disruption of services, and potential lateral movement within the network. The vulnerability's remote nature means attackers do not require physical access or local network privileges to exploit it, making it particularly dangerous in cloud-based deployments where applications are accessible from various network locations.
Security professionals should implement immediate mitigations including input validation, output encoding, and proper sanitization of all user-supplied data within menu components. The recommended approach aligns with ATT&CK technique T1059.007 for command and script injection, emphasizing the need for robust input filtering mechanisms. Organizations should also consider implementing Content Security Policy headers to limit script execution capabilities, deploy web application firewalls to detect and block malicious payloads, and ensure all systems are updated to the latest patched versions of Cybozu Garoon. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other application components, as this vulnerability demonstrates the importance of comprehensive input validation across all user-facing interfaces.