CVE-2015-0900 in Fumy Teacher's Schedule Board
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in schedule.cgi in Nishishi Factory Fumy Teacher's Schedule Board 1.10 through 2.21 allows remote attackers to inject arbitrary web script or HTML via a crafted URL.
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Analysis
by VulDB Data Team • 04/15/2018
The vulnerability identified as CVE-2015-0900 represents a critical cross-site scripting flaw within the Nishishi Factory Fumy Teacher's Schedule Board web application. This security weakness affects versions 1.10 through 2.21 of the software, specifically within the schedule.cgi component that handles calendar and scheduling functionality. The flaw enables remote attackers to execute malicious scripts in the context of other users' browsers, potentially compromising the confidentiality and integrity of sensitive educational data. The vulnerability manifests when users navigate to a specially crafted URL that contains malicious script code, which gets executed in the victim's browser session.
The technical implementation of this XSS vulnerability stems from inadequate input validation and output encoding within the schedule.cgi script. When the application processes user-supplied URL parameters without proper sanitization, it fails to escape or encode special characters that could be interpreted as HTML or JavaScript code. This allows attackers to inject malicious payloads that persist in the application's response, executing in the browser context of legitimate users. The vulnerability falls under CWE-79 which categorizes cross-site scripting as a fundamental web application security weakness involving the improper handling of untrusted data.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform various malicious activities including session hijacking, credential theft, and data manipulation. An attacker could craft URLs that redirect users to phishing sites, steal authentication cookies, or modify schedule data to disrupt educational planning. The attack surface is particularly concerning in educational environments where teachers and administrators frequently access scheduling systems, as these users often possess sensitive information about student schedules, class timetables, and institutional operations. The vulnerability creates a persistent threat vector that remains active as long as the affected software versions are deployed.
Mitigation strategies for CVE-2015-0900 should prioritize immediate remediation through software updates to versions that address the XSS vulnerability. Organizations should implement comprehensive input validation and output encoding mechanisms throughout the application, particularly for all user-supplied data that gets rendered in web responses. The implementation of Content Security Policy headers can provide additional defense-in-depth measures to prevent script execution from unauthorized sources. Regular security testing including dynamic application security testing and manual penetration testing should be conducted to identify similar vulnerabilities. According to ATT&CK framework, this vulnerability maps to technique T1531 which involves the exploitation of web application vulnerabilities for privilege escalation and data access, emphasizing the need for comprehensive web application security controls and user education about suspicious URL parameters.