CVE-2021-33489 in OX App Suite
Summary
by MITRE • 11/22/2021
OX App Suite through 7.10.5 allows XSS via JavaScript code in a shared XCF file.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 11/25/2021
The vulnerability CVE-2021-33489 represents a cross-site scripting flaw in OX App Suite versions up to 7.10.5 that occurs when processing shared XCF files. This vulnerability stems from inadequate input validation and sanitization mechanisms within the application's file handling processes. When users access shared XCF files containing malicious javascript code, the application fails to properly escape or filter the content before rendering it in the user's browser environment. The issue specifically manifests in the way the system processes and displays file metadata or content within the web interface, creating an avenue for attackers to inject malicious scripts that execute in the context of other users' sessions.
The technical exploitation of this vulnerability occurs through the manipulation of XCF file formats which are typically used for sharing configuration data within the application ecosystem. When a user accesses a shared XCF file, the application parses the file content and displays it within the user interface without sufficient sanitization of potentially malicious javascript code embedded within the file structure. This allows an attacker to craft a malicious XCF file containing javascript payloads that execute when other users view the shared file, effectively enabling the attacker to execute arbitrary code within the victim's browser context. The vulnerability is categorized under CWE-79 as a failure to sanitize user input, specifically in the context of web application security where user-supplied data is not properly escaped before being rendered to the browser.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the ability to perform session hijacking, steal sensitive user data, and potentially escalate privileges within the application environment. Attackers can leverage this flaw to create persistent backdoors in user sessions, monitor user activities, and access confidential information stored within the application. The vulnerability is particularly concerning in enterprise environments where multiple users share common application resources and where the XCF file sharing functionality is widely utilized. The attack surface is broad as any user who accesses a maliciously crafted XCF file becomes a potential victim, making this a significant threat vector for organizations relying on the affected application versions.
Mitigation strategies for CVE-2021-33489 should focus on immediate patching of the affected OX App Suite versions to the latest releases that contain proper input sanitization and validation mechanisms. Organizations should implement strict file validation policies that prevent the upload and sharing of potentially malicious files, particularly those with extensions that could contain executable content. Network-level controls such as web application firewalls can provide additional protection by filtering suspicious content patterns in file uploads and shared resources. Security teams should also conduct regular security assessments of shared file systems and implement user education programs to raise awareness about the risks of accessing untrusted shared files. The remediation process should include comprehensive testing to ensure that the patch does not introduce regressions in legitimate file handling functionality while maintaining the security posture of the application environment.