CVE-2019-16307 in DocuShare
Summary
by MITRE
A Reflected Cross-Site Scripting (XSS) vulnerability in the webEx module in webExMeetingLogin.jsp and deleteWebExMeetingCheck.jsp in Fuji Xerox DocuShare through 7.0.0.C1.609 allows remote attackers to inject arbitrary web script or HTML via the handle parameter (webExMeetingLogin.jsp) and meetingKey parameter (deleteWebExMeetingCheck.jsp).
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Analysis
by VulDB Data Team • 12/25/2023
The vulnerability identified as CVE-2019-16307 represents a critical reflected cross-site scripting flaw within the webEx module of Fuji Xerox DocuShare version 7.0.0.C1.609 and earlier. This security weakness manifests in two specific.jsp files: webExMeetingLogin.jsp and deleteWebExMeetingCheck.jsp, where improper input validation allows malicious actors to inject arbitrary web scripts or HTML content. The vulnerability stems from the application's failure to adequately sanitize user-supplied parameters before incorporating them into web responses, creating an avenue for attackers to execute malicious code within the context of authenticated user sessions.
The technical exploitation of this vulnerability occurs through the manipulation of two distinct parameters within the affected web pages. Attackers can exploit the handle parameter in webExMeetingLogin.jsp to inject malicious scripts that will be reflected back to users who access the compromised page. Similarly, the meetingKey parameter in deleteWebExMeetingCheck.jsp provides another injection vector where attackers can craft malicious payloads that will be executed when the page processes the user input. This reflected XSS vulnerability operates by tricking users into clicking malicious links that contain the attacker's script payload, which is then executed in the victim's browser when they navigate to the affected page. The flaw directly maps to CWE-79, which defines the common weakness of improper neutralization of input during web page generation, and aligns with ATT&CK technique T1203, which covers Exploitation for Client Execution through web-based attacks.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable attackers to perform session hijacking, steal sensitive user credentials, redirect victims to malicious sites, or perform actions on behalf of authenticated users. Given that DocuShare is a document management platform, successful exploitation could lead to unauthorized access to confidential business documents, compromise of user authentication tokens, and potential lateral movement within network environments where the platform is deployed. The reflected nature of the vulnerability means that the malicious payload must be delivered through external means such as email phishing campaigns, compromised web links, or social engineering tactics, making it particularly dangerous in enterprise environments where users frequently interact with external communications. Organizations using vulnerable versions of Fuji Xerox DocuShare face significant risk of data breaches and unauthorized access to their document repositories, particularly when users have administrative privileges or access to sensitive corporate information.
Mitigation strategies for CVE-2019-16307 should prioritize immediate patch application from Fuji Xerox, as this represents the most effective defense against the vulnerability. Organizations should also implement comprehensive input validation and output encoding mechanisms to prevent similar issues in other applications, including the implementation of Content Security Policy headers to limit script execution. Additionally, security awareness training for users can help prevent successful phishing campaigns that might exploit this vulnerability, while network monitoring solutions can detect suspicious traffic patterns associated with exploitation attempts. The vulnerability underscores the importance of regular security assessments and vulnerability management programs, particularly for enterprise document management systems that handle sensitive data and require robust security controls to prevent unauthorized access and data compromise.