CVE-2024-7398 in Concrete
Summary
by MITRE • 09/25/2024
Concrete CMS versions 9 through 9.3.3 and versions below 8.5.19 are vulnerable to stored XSS in the calendar event addition feature because the calendar event name was not sanitized on output. Users or groups with permission to create event calendars can embed scripts, and users or groups with permission to modify event calendars can execute scripts. The Concrete CMS Security Team gave this vulnerability a CVSS v4 score of 1.8 with vector CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:A/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:A/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N . Thank you, Yusuke Uchida for reporting.
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Analysis
by VulDB Data Team • 01/21/2025
The vulnerability CVE-2024-7398 represents a stored cross-site scripting flaw within Concrete CMS that affects versions ranging from 9 through 9.3.3 and below version 8.5.19. This security weakness specifically targets the calendar event addition functionality where the system fails to properly sanitize user input when displaying calendar event names. The flaw occurs because the application does not implement adequate output encoding or sanitization measures for calendar event names before rendering them in web pages, creating an environment where malicious scripts can be persistently stored and executed. The vulnerability demonstrates characteristics aligned with CWE-79, which specifically addresses cross-site scripting flaws where untrusted data is improperly sanitized before being rendered in web applications. This particular implementation issue allows attackers to inject malicious JavaScript code that will execute whenever the affected calendar events are displayed to users, making it a persistent threat that can affect multiple users over time.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with significant privileges based on the permission model of Concrete CMS. Users or groups with permission to create event calendars can embed malicious scripts into calendar events, while those with modification permissions can execute existing scripts. This dual privilege model creates multiple attack vectors and increases the potential for exploitation since different user roles may have varying levels of access. The CVSS v4 score of 1.8 indicates a low severity threat but the vector analysis reveals several concerning characteristics including high attack complexity and the requirement for privileged access, suggesting that while exploitation is not trivial, it remains a viable attack path for authenticated users. The vulnerability affects the system's integrity and availability through potential data manipulation, though the current CVSS score indicates minimal impact to confidentiality and availability. The low scope change component suggests that the attack primarily affects the specific calendar functionality rather than broader system components, yet the persistent nature of stored XSS allows for extended exploitation periods.
Mitigation strategies for CVE-2024-7398 should prioritize immediate implementation of input sanitization and output encoding measures within the calendar event handling functionality. Organizations should ensure that all user-supplied data, particularly in calendar event names, undergoes proper HTML entity encoding before rendering in web interfaces. The security team should implement proper content security policies that prevent script execution in calendar displays and consider implementing input validation that blocks potentially malicious characters or patterns. Additionally, the system should enforce least privilege principles for calendar management permissions, ensuring that only trusted users have the ability to create or modify calendar events. Regular security audits should verify that all user input is properly sanitized, and automated testing should be implemented to detect similar vulnerabilities in other application components. The vulnerability also highlights the importance of following ATT&CK framework tactics related to initial access and execution, as attackers could leverage this vulnerability to establish persistent access through calendar-based social engineering or direct script injection. Organizations should also consider implementing web application firewalls and monitoring systems that can detect and block suspicious script injection attempts in calendar-related functionality. The remediation process should include updating to the latest Concrete CMS versions where this vulnerability has been addressed, as well as conducting comprehensive security reviews of all calendar and event management features to identify similar output sanitization issues.