CVE-2013-6912 in Garoon
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in a calendar component in Cybozu Garoon before 3.7.2, when Internet Explorer 6 through 9 is used, allows remote authenticated users to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 03/02/2019
The vulnerability identified as CVE-2013-6912 represents a cross-site scripting flaw within the calendar component of Cybozu Garoon software versions prior to 3.7.2. This security weakness specifically affects users operating Internet Explorer versions 6 through 9, creating a significant attack surface that malicious actors can exploit to execute unauthorized code within the context of authenticated user sessions. The vulnerability stems from insufficient input validation and output encoding mechanisms within the calendar functionality, which fails to properly sanitize user-supplied data before rendering it in web pages. The affected component processes calendar-related data without adequate protection against malicious script injection, allowing attackers to manipulate the application's behavior through crafted input vectors. This flaw operates under the Common Weakness Enumeration classification of CWE-79, which specifically addresses cross-site scripting vulnerabilities where untrusted data is improperly handled during web page generation.
The operational impact of this vulnerability extends beyond simple data theft or display manipulation, as it enables authenticated attackers to execute arbitrary web scripts within the victim's browser session. When an authenticated user interacts with the vulnerable calendar component, the malicious code injected by the attacker can access the user's session cookies, potentially leading to session hijacking or privilege escalation attacks. The vulnerability's exploitation requires the victim to be logged into the Garoon application and to view the malicious calendar content, making it particularly dangerous in enterprise environments where users frequently interact with calendar functionalities. Attackers can craft calendar events, meeting requests, or other calendar-related content containing malicious script payloads that execute when the victim views the calendar interface, leveraging the trust relationship between the user and the application.
The security implications of CVE-2013-6912 align with tactics described in the MITRE ATT&CK framework under the initial access and execution phases, where adversaries establish footholds through web-based attacks and then execute malicious code within target environments. The vulnerability's targeting of Internet Explorer versions 6 through 9 is particularly concerning as these older browsers often lack modern security mitigations such as content security policies and stricter script execution controls that would otherwise prevent or limit the impact of such attacks. Organizations utilizing older browser versions face heightened risk exposure, as these legacy browsers typically have reduced security features and are more susceptible to various web-based attack vectors. The vulnerability's persistence across multiple IE versions suggests a fundamental flaw in the calendar component's input handling that was not adequately addressed in the software's security architecture, potentially indicating broader architectural issues within the application's data processing pipelines.
Mitigation strategies for this vulnerability should prioritize immediate software updates to version 3.7.2 or later, which includes proper input validation and output encoding fixes. Organizations should implement comprehensive web application firewalls and content security policies to detect and prevent malicious script injection attempts, while also conducting regular security assessments of their calendar and collaboration applications. Browser upgrade initiatives should be prioritized to move away from unsupported IE versions, as these legacy browsers present multiple security risks beyond this specific vulnerability. Additional defensive measures include implementing strict input sanitization protocols, regular security code reviews, and user education regarding the dangers of clicking on suspicious calendar events or meeting requests from untrusted sources. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date software components and implementing robust security controls in enterprise collaboration platforms where user interactions with calendar and scheduling functionalities occur regularly.