CVE-2018-0549 in Garoon
Summary
by MITRE
Cross-site scripting vulnerability in Cybozu Garoon 3.0.0 to 4.6.0 allows remote authenticated attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 01/25/2020
The vulnerability identified as CVE-2018-0549 represents a critical cross-site scripting flaw within Cybozu Garoon software versions 3.0.0 through 4.6.0. This vulnerability specifically affects authenticated users who can leverage the flaw to execute malicious code within the context of other users' browsers. The issue stems from inadequate input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before rendering it in web pages. The vulnerability is classified under CWE-79 as an Improper Neutralization of Input During Web Page Generation, which is a fundamental web application security weakness that enables attackers to inject malicious scripts.
The technical exploitation of this vulnerability occurs when authenticated attackers manipulate input fields or parameters within the Garoon application to inject malicious script code. These scripts can be executed in the browser context of other authenticated users who view the affected content, potentially leading to session hijacking, credential theft, or data exfiltration. The unspecified vectors suggest that the vulnerability may manifest across multiple input points within the application, making it particularly challenging to fully mitigate without comprehensive input validation. Attackers can leverage this weakness to establish persistent access to user sessions and escalate privileges within the application environment.
From an operational impact perspective, this vulnerability poses significant risks to organizations using Cybozu Garoon as their collaboration platform. The authenticated nature of the attack means that adversaries must first obtain valid credentials, but once achieved, they can execute arbitrary code against other users within the same organization. This creates a potential for widespread compromise, especially in environments where users have elevated privileges or access to sensitive business data. The vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter: JavaScript, and T1566.001 for Phishing: Spearphishing Attachment, as attackers can use this flaw to deliver malicious payloads through compromised user sessions.
Organizations should implement immediate mitigations including comprehensive input validation, output encoding, and strict content security policies to prevent script injection attacks. The recommended approach involves deploying web application firewalls, implementing proper sanitization of all user inputs, and applying the latest security patches from Cybozu. Additionally, organizations should conduct regular security assessments and implement security awareness training to reduce the risk of credential compromise that could lead to exploitation of this vulnerability. The vulnerability demonstrates the critical importance of maintaining up-to-date security measures and proper input validation mechanisms in collaborative software environments.