CVE-2017-2255 in Garoon
Summary
by MITRE
Cross-site scripting vulnerability in Cybozu Garoon 3.7.0 to 4.2.5 allows an attacker to inject arbitrary web script or HTML via "Rich text" funtion of the application "Space".
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Analysis
by VulDB Data Team • 11/11/2019
The vulnerability identified as CVE-2017-2255 represents a critical cross-site scripting flaw discovered in Cybozu Garoon versions ranging from 3.7.0 through 4.2.5. This security weakness specifically affects the "Space" application within the Garoon platform, which serves as a collaborative workspace environment for organizations. The vulnerability stems from insufficient input validation and output encoding mechanisms within the rich text functionality of the Space application, creating an exploitable condition that enables malicious actors to inject arbitrary web scripts or HTML content into the application's user interface.
The technical implementation of this vulnerability occurs when users interact with the rich text editing features of the Space application, where user-supplied content is not properly sanitized before being rendered to other users. This allows attackers to craft malicious payloads that execute within the context of other users' browsers when they view the affected content. The flaw operates under CWE-79 which classifies it as a Cross-Site Scripting vulnerability, specifically categorized as a weakness in input validation where user-provided data is directly incorporated into web pages without proper sanitization or encoding. The vulnerability manifests as a persistent XSS attack vector, meaning that malicious scripts can be stored on the server and executed whenever other users access the compromised content.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with the capability to perform session hijacking, steal sensitive user credentials, access confidential information, or redirect users to malicious websites. Attackers can exploit this flaw to gain unauthorized access to user accounts, potentially compromising entire organizational networks through credential theft or privilege escalation. The persistent nature of the vulnerability means that once exploited, the malicious content remains active until manually removed by administrators, creating an ongoing security risk for all users within the affected environment. Organizations using Cybozu Garoon in their collaborative workflows face significant exposure to data breaches, unauthorized access, and potential regulatory compliance violations.
Mitigation strategies for this vulnerability require immediate patching of the affected Cybozu Garoon versions to the latest available security updates from the vendor. System administrators should implement comprehensive input validation measures that sanitize all user-provided content before storage and rendering, including implementing proper HTML encoding techniques for rich text fields. Network security controls such as web application firewalls should be deployed to detect and block suspicious script injection attempts. Additionally, organizations should conduct regular security assessments of their collaborative platforms, implement least-privilege access controls for the Space application, and establish monitoring procedures to detect unauthorized content modifications. The remediation process must also include user education regarding safe content sharing practices and regular security awareness training to prevent social engineering attacks that might exploit this vulnerability. Organizations should consider implementing content security policies and regular vulnerability scanning of their web applications to prevent similar issues in other collaborative platforms within their infrastructure.