CVE-2013-6903 in Garoon
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in a schedule component in Cybozu Garoon before 3.7.0, when Internet Explorer or Firefox is used, allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 03/02/2019
The CVE-2013-6903 vulnerability represents a critical cross-site scripting flaw discovered in Cybozu Garoon's schedule component prior to version 3.7.0. This vulnerability specifically affects users operating through Internet Explorer or Firefox browsers, creating a significant security risk for organizations relying on this collaboration platform. The vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as a common web application security weakness that enables attackers to inject malicious client-side scripts into web applications. The flaw manifests when the schedule component fails to properly sanitize user input, allowing attackers to execute arbitrary web scripts or HTML code within the context of other users' browsers.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding mechanisms within the schedule component's processing pipeline. When users interact with the scheduling functionality, the application does not adequately filter or escape special characters in user-supplied data before rendering it back to the browser. This creates an environment where malicious actors can craft specially formatted input that, when processed by the application, gets executed as legitimate script code. The vulnerability's impact is particularly concerning because it affects two of the most widely used web browsers, expanding the potential attack surface significantly. Attackers can leverage this flaw to execute persistent XSS attacks, potentially stealing session cookies, redirecting users to malicious sites, or performing actions on behalf of authenticated users.
The operational implications of CVE-2013-6903 extend beyond simple script injection, as it fundamentally compromises the integrity and confidentiality of the Garoon platform's user data. Organizations utilizing this software face potential data breaches, session hijacking, and unauthorized access to sensitive scheduling information. The vulnerability can be exploited through various attack vectors including email attachments, calendar entries, or shared scheduling resources where users might inadvertently trigger the malicious code execution. From an attacker's perspective, this vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter: JavaScript, enabling persistent access and data exfiltration. The security implications are particularly severe in enterprise environments where scheduling systems often contain sensitive business information, personal data, and operational details that could be exploited for further attacks or corporate espionage.
Organizations should implement immediate mitigation strategies including updating to Cybozu Garoon version 3.7.0 or later, which contains the necessary patches to address the XSS vulnerability. Additional protective measures include implementing Content Security Policy headers, enabling proper input validation at multiple layers, and conducting regular security testing of web applications. The vulnerability demonstrates the critical importance of maintaining up-to-date software versions and implementing comprehensive security controls. Security teams should also consider deploying web application firewalls to detect and prevent exploitation attempts, while establishing monitoring protocols to identify potential abuse of the vulnerability. Regular security awareness training for users can help prevent social engineering attacks that might exploit this vulnerability, and implementing proper access controls can limit the damage if exploitation occurs. This case highlights the necessity of following security best practices such as input sanitization, output encoding, and regular vulnerability assessments to maintain robust web application security posture.