CVE-2021-43960 in Connect2
Summary
by MITRE • 01/12/2022
** DISPUTED ** Lorensbergs Connect2 3.13.7647.20190 is affected by an XSS vulnerability. Exploitation requires administrator privileges and is performed through the Wizard editor of the application. The attack requires an administrator to go into the Wizard editor and enter an XSS payload within the Page title, Page Instructions, Text before, Text after, or Text on side box. Once this has been done, the administrator must click save and finally wait until any user of the application performs a booking for rental items in the booking area of the application, where the XSS triggers. NOTE: another perspective is that the administrator may require JavaScript to customize any aspect of the page rendering. There is no effective way for the product to defend users in the face of a malicious administrator.
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Analysis
by VulDB Data Team • 05/02/2025
This vulnerability exists within Lorensbergs Connect2 version 3.13.7647.20190, representing a cross-site scripting flaw that demonstrates a critical weakness in web application security controls. The vulnerability is categorized as a client-side attack vector that allows malicious code execution in the context of a victim's browser session. The flaw specifically manifests through the application's Wizard editor interface, which serves as a content management tool for administrators to configure various page elements including titles, instructions, and text placements. The vulnerability requires elevated privileges to exploit, as it specifically targets the administrative interface where authorized users can modify application content, making it a privilege escalation concern within the application's access control framework.
The technical implementation of this vulnerability occurs through the manipulation of page rendering components within the Wizard editor. Attackers must inject malicious JavaScript payloads into specific fields such as Page title, Page Instructions, Text before, Text after, or Text on side box parameters. When these elements are saved and subsequently processed during the booking workflow, the malicious code executes within the browser context of any user who interacts with the affected pages. This execution model follows the classic XSS attack pattern where user-supplied data is improperly sanitized and directly rendered without adequate output encoding or validation mechanisms. The vulnerability's exploitation timeline requires an administrator to perform the malicious action and then wait for legitimate users to engage with the booking functionality, creating a time-dependent attack scenario.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it represents a fundamental breakdown in application security architecture. The attack vector demonstrates how administrative functions can become attack surfaces when proper input validation and output sanitization are absent from content management interfaces. The fact that the vulnerability requires administrator privileges to initially inject malicious code suggests that it operates within the application's trusted zone, making it particularly dangerous as it allows for privilege-based attacks that can compromise all users within the application's scope. This scenario aligns with CWE-79, which specifically addresses cross-site scripting vulnerabilities in web applications, and reflects the broader category of insecure data handling within web interfaces. The attack's effectiveness is amplified by the fact that it can be triggered through legitimate application workflows, making detection more difficult and increasing the potential for widespread impact.
The mitigation strategy for this vulnerability must address both the immediate security flaw and the underlying architectural issues that permit administrative privilege abuse. Organizations should implement comprehensive input validation and output encoding mechanisms throughout the application's data handling pipeline, particularly within content management interfaces. The application should enforce strict sanitization of all user inputs before rendering them in browser contexts, implementing proper HTML encoding and context-aware output filtering. Additionally, the application architecture should consider implementing a principle of least privilege for administrative functions, ensuring that content modifications do not automatically execute without additional verification steps. From a defensive standpoint, this vulnerability aligns with ATT&CK technique T1059.007, which covers script injection attacks, and requires organizations to establish robust monitoring for anomalous administrative activities and implement proper web application firewall rules to detect and block malicious payload delivery. The vulnerability's nature also suggests the need for enhanced session management controls and user activity logging to detect unauthorized administrative actions that could lead to XSS exploitation.
The disputed nature of this vulnerability highlights the complexity of security assessments in multi-layered applications where the distinction between legitimate administrative functions and potential attack vectors can be ambiguous. The alternative perspective suggesting that JavaScript customization capabilities inherently create security risks indicates a fundamental architectural challenge in balancing application functionality with security controls. This assessment demonstrates that the vulnerability's classification may depend on the specific threat model and security assumptions established by the application's security architecture. The lack of effective defense mechanisms for end users against malicious administrators represents a significant architectural weakness that requires comprehensive security design reviews and implementation of robust access control measures. The vulnerability serves as a reminder of the critical importance of validating all user inputs regardless of the user's privilege level and implementing defense-in-depth strategies that protect against both external and internal threats.