CVE-2024-1020 in Rebuild
Summary
by MITRE • 01/30/2024
A vulnerability classified as problematic was found in Rebuild up to 3.5.5. Affected by this vulnerability is the function getStorageFile of the file /filex/proxy-download. The manipulation of the argument url leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The identifier VDB-252289 was assigned to this vulnerability.
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Analysis
by VulDB Data Team • 02/21/2024
This vulnerability exists within the Rebuild content management system version 3.5.5 and earlier, specifically affecting the getStorageFile function in the /filex/proxy-download component. The flaw represents a cross site scripting vulnerability that arises from insufficient input validation of the url parameter, allowing malicious actors to inject arbitrary script code into the application's response. The vulnerability's classification as problematic indicates significant security implications that could compromise user sessions and enable unauthorized access to sensitive data within the system. The attack vector is remote, meaning that threat actors can exploit this weakness without requiring physical access to the target system or direct network proximity.
The technical implementation of this vulnerability stems from improper sanitization of user-supplied input within the proxy-download functionality. When the getStorageFile function processes the url argument, it fails to adequately validate or escape special characters that could be interpreted as executable code by web browsers. This processing gap creates an environment where malicious payloads can be injected and subsequently executed in the context of other users' browsers. The vulnerability's presence in the proxy-download module suggests that the application acts as an intermediary for file access, potentially processing external URLs that are not properly filtered before being rendered in web responses. The public disclosure of this exploit through identifier VDB-252289 indicates that threat actors have already developed working attack code, increasing the risk to affected systems.
The operational impact of this vulnerability extends beyond simple script execution, potentially enabling session hijacking, credential theft, and data exfiltration. Attackers could leverage the XSS capability to steal authentication tokens, redirect users to malicious sites, or inject additional malware into the victim's browser environment. The remote exploitation capability means that organizations with exposed Rebuild installations face immediate risk, as attackers can target the vulnerability from anywhere on the internet without requiring local system access. This weakness particularly affects web applications that rely on user-provided URLs for proxy functionality, where the application acts as a conduit for external content delivery. The vulnerability's exploitation could result in unauthorized data access, system compromise, and potential lateral movement within network environments where Rebuild systems are deployed.
Organizations should implement immediate mitigations including input validation and output encoding for all user-supplied parameters, particularly those used in proxy or file handling functions. The recommended approach involves implementing strict validation of URL formats and character encoding to prevent script injection attempts. Additionally, organizations should consider implementing content security policies to limit script execution capabilities within the application's response context. The vulnerability aligns with CWE-79 Cross Site Scripting, which specifically addresses the injection of malicious scripts into web applications. From an ATT&CK framework perspective, this vulnerability maps to T1059 Command and Scripting Interpreter, as it enables attackers to execute malicious scripts within user browsers. Regular security updates and patch management should be prioritized to address this vulnerability, as the public disclosure of exploit code significantly increases the window of opportunity for threat actors to compromise affected systems.