CVE-2018-0527 in Office
Summary
by MITRE
Cross-site scripting vulnerability in Cybozu Office 10.0.0 to 10.7.0 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 02/21/2020
The vulnerability identified as CVE-2018-0527 represents a critical cross-site scripting flaw within Cybozu Office versions 10.0.0 through 10.7.0, classified under CWE-79 - Improper Neutralization of Input During Web Page Generation. This vulnerability enables remote attackers to execute malicious scripts in the context of a victim's browser session, potentially leading to unauthorized access to sensitive information, session hijacking, or redirection to malicious websites. The unspecified vectors suggest that the flaw exists across multiple input points within the application's web interface where user-supplied data is not properly sanitized before being rendered back to users.
The technical exploitation of this vulnerability occurs when user input is directly incorporated into web page output without adequate validation or encoding mechanisms. Attackers can craft malicious payloads that, when executed, can steal session cookies, modify web page content, redirect users to phishing sites, or perform actions on behalf of authenticated users. This type of vulnerability falls under the ATT&CK framework's T1059.001 - Command and Scripting Interpreter: JavaScript, as it leverages the browser's scripting capabilities to execute malicious code. The impact extends beyond simple data theft, as successful exploitation can lead to complete compromise of user sessions and potential lateral movement within network environments where Cybozu Office is deployed.
The operational impact of CVE-2018-0527 is significant for organizations utilizing Cybozu Office, as the vulnerability affects a substantial range of versions that were widely deployed in enterprise environments. Organizations may experience data breaches, unauthorized access to confidential documents, and potential compromise of entire user accounts if attackers successfully exploit this flaw. The remote nature of the vulnerability means that attackers do not require physical access to systems or insider knowledge to exploit it, making the attack surface particularly broad. This vulnerability particularly affects collaborative environments where users frequently input data into shared applications, as the attack vector could be as simple as a malicious link shared via email or instant messaging.
Mitigation strategies for CVE-2018-0527 should prioritize immediate patching of affected Cybozu Office versions to the latest releases that contain the necessary security fixes. Organizations should also implement input validation and output encoding mechanisms to prevent malicious scripts from executing in web applications. Network segmentation and web application firewalls can provide additional layers of protection by monitoring and filtering suspicious traffic patterns. The implementation of Content Security Policy headers can further limit the execution of unauthorized scripts in browser environments. Security teams should conduct regular vulnerability assessments and penetration testing to identify similar flaws in other applications and ensure comprehensive protection against similar cross-site scripting vulnerabilities that may exist in the broader application ecosystem.