CVE-2011-1333 in Office
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Cybozu Office 6 and Cybozu Garoon 2.0.0 through 2.1.3 allows remote attackers to inject arbitrary web script or HTML via vectors related to "downloading graphic files from the bulletin board system."
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Analysis
by VulDB Data Team • 02/09/2019
The vulnerability identified as CVE-2011-1333 represents a critical cross-site scripting flaw affecting Cybozu Office 6 and Cybozu Garoon 2.0.0 through 2.1.3 software versions. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is a fundamental web application security weakness that allows attackers to inject malicious scripts into web pages viewed by other users. The specific attack vector involves the downloading of graphic files from the bulletin board system component of these applications, creating an unexpected entry point for malicious code execution.
The technical implementation of this vulnerability occurs when the application fails to properly sanitize user input during the graphic file download process within the bulletin board system. When users upload or reference graphic files through the bulletin board interface, the application does not adequately validate or escape the file names or associated metadata before rendering them in web pages. This lack of input sanitization creates an environment where attackers can embed malicious JavaScript code within file names or metadata that gets executed when other users view the bulletin board content. The vulnerability specifically targets the web application's output rendering mechanisms rather than its input validation, making it particularly insidious as legitimate file operations become vectors for malicious code delivery.
The operational impact of this vulnerability extends beyond simple script injection, potentially enabling attackers to perform session hijacking, deface web applications, steal sensitive user information, or redirect users to malicious websites. Attackers could exploit this weakness to create persistent XSS payloads that would execute in the context of authenticated users' browsers, potentially leading to complete compromise of user sessions and access to confidential data within the Cybozu applications. The bulletin board system's role as a user-facing component makes this vulnerability particularly dangerous as it can affect multiple users simultaneously when they access compromised content.
Security practitioners should implement multiple layers of mitigation strategies to address this vulnerability effectively. Input validation and output encoding should be strengthened throughout the application's file handling processes, particularly for user-generated content in bulletin board systems. The implementation of Content Security Policy headers and proper HTML escaping mechanisms would significantly reduce the risk of successful XSS exploitation. Additionally, regular security updates and patches from Cybozu should be implemented immediately upon availability, as this vulnerability affects widely used business collaboration platforms. The ATT&CK framework categorizes this as a web application attack vector under the T1059.007 technique for script injection, emphasizing the need for comprehensive web application security testing and monitoring to detect similar vulnerabilities in related systems. Organizations should also consider network-based intrusion detection systems to monitor for suspicious file download activities that might indicate exploitation attempts.