CVE-2020-28945 in OX App Suite
Summary
by MITRE • 05/04/2021
OX App Suite 7.10.4 and earlier allows XSS via crafted content to reach an undocumented feature, such as ![](http://onerror=Function.constructor, in a Notes item.
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Analysis
by VulDB Data Team • 05/07/2021
The vulnerability CVE-2020-28945 represents a cross-site scripting flaw within OX App Suite version 7.10.4 and earlier systems. This security weakness arises from inadequate input validation and sanitization mechanisms that fail to properly filter malicious content submitted through Notes items. The vulnerability specifically exploits an undocumented feature within the application's processing pipeline, making it particularly dangerous as it operates outside the typical security monitoring boundaries. Attackers can leverage this flaw by injecting crafted content containing javascript execution directives that bypass standard security controls.
The technical implementation of this vulnerability demonstrates a sophisticated understanding of how modern web applications handle user input and render content. When users submit Notes items containing malicious payloads such as ![](http://onerror=Function.constructor, the application fails to properly sanitize or escape these inputs before rendering them within the browser context. This creates a persistent XSS vector that can be exploited across different user sessions and contexts within the application. The use of Function.constructor in the payload suggests an attempt to bypass traditional script tag filtering mechanisms by leveraging javascript's dynamic execution capabilities.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking. An attacker who successfully exploits this vulnerability can execute arbitrary javascript code within the context of any user's session, potentially leading to complete account compromise, data exfiltration, and lateral movement within the organization's network. The undocumented nature of the affected feature means that standard security controls and monitoring systems may not detect the malicious activity, creating a significant blind spot in the application's security posture. This vulnerability particularly affects collaborative environments where users frequently share Notes items and documents.
Organizations utilizing OX App Suite in production environments should prioritize immediate patching of this vulnerability as it represents a critical security risk. The mitigation strategy should include implementing comprehensive input validation at multiple layers including client-side and server-side sanitization, deploying web application firewalls with XSS detection capabilities, and conducting thorough security testing of all user input handling mechanisms. Additionally, security teams should review and update their monitoring rules to detect anomalous patterns in Notes item submissions that could indicate exploitation attempts. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws and may be categorized under ATT&CK technique T1059.007 for scripting languages, emphasizing the importance of proper input validation and output encoding in preventing such attacks.