CVE-2017-9072 in Health Sciences Empirica Signal
Summary
by MITRE
Two CalendarXP products have XSS in common parts of HTML files. CalendarXP FlatCalendarXP through 9.9.290 has XSS in iflateng.htm and nflateng.htm. CalendarXP PopCalendarXP through 9.8.308 has XSS in ipopeng.htm and npopeng.htm.
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Analysis
by VulDB Data Team • 12/24/2019
The vulnerability CVE-2017-9072 represents a cross-site scripting weakness affecting multiple versions of the CalendarXP calendar products, specifically targeting the FlatCalendarXP and PopCalendarXP components. This vulnerability exists within the common HTML file structures shared across these calendar implementations, making it particularly concerning as it affects the core functionality of these widely used calendar applications. The affected files include iflateng.htm and nflateng.htm for the FlatCalendarXP product, while PopCalendarXP is impacted through ipopeng.htm and npopeng.htm files, indicating a systemic issue within the HTML rendering components of these calendar applications.
The technical flaw manifests as a failure to properly sanitize user input within the HTML generation processes of these calendar components. When calendar applications process user-provided data for display in calendar views, the input validation mechanisms are insufficient to prevent malicious script execution. This weakness allows attackers to inject malicious JavaScript code through parameters or content that gets rendered in the calendar interface, creating a persistent XSS vulnerability that can be exploited across different calendar implementations. The vulnerability specifically affects the English language versions of these calendar components, suggesting that the input sanitization issues are localized to the text processing and HTML generation functions used in these particular language variants.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it can enable attackers to execute arbitrary code within the context of the user's browser session. This allows for session hijacking, credential theft, and potential lateral movement within networks where users interact with affected calendar applications. The vulnerability affects both flat and popup calendar implementations, meaning that any user interacting with calendar functionality through these applications could be exposed to attack vectors. The widespread use of these calendar components in enterprise environments makes this vulnerability particularly dangerous, as it could potentially compromise multiple systems through a single exploitation point. The vulnerability's persistence across multiple versions indicates that the underlying sanitization issues have not been properly addressed in the product development lifecycle.
Mitigation strategies should focus on immediate input validation and output encoding within the affected calendar applications. Organizations should implement proper HTML escaping mechanisms for all user-provided content before rendering it in calendar views, ensuring that any potentially malicious scripts are neutralized before execution. The recommended approach includes applying the latest security patches from the vendor, implementing web application firewalls to detect and block XSS attempts, and conducting thorough security assessments of calendar applications within the environment. Additionally, security teams should consider implementing content security policies to prevent script execution in calendar interfaces. This vulnerability aligns with CWE-79 which addresses cross-site scripting flaws, and represents a common attack vector that maps to ATT&CK technique T1211 for exploiting vulnerabilities in web applications. The remediation process should also include regular security testing and code reviews to prevent similar issues in future calendar implementations, emphasizing the importance of secure coding practices in calendar and scheduling applications.