CVE-2024-29273 in dzzoffice
Summary
by MITRE • 03/22/2024
There is Stored Cross-Site Scripting (XSS) in dzzoffice 2.02.1 SC UTF8 in uploadfile to index.php, with the XSS payload in an SVG document.
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Analysis
by VulDB Data Team • 04/13/2025
The vulnerability identified as CVE-2024-29273 represents a critical stored cross-site scripting flaw within dzzoffice version 2.02.1 SC UTF8, specifically manifesting during the file upload process to index.php. This vulnerability allows attackers to execute malicious scripts in the context of other users' browsers through the manipulation of SVG documents. The flaw occurs when the application fails to properly sanitize or validate SVG content uploaded through the index.php endpoint, creating a persistent XSS vector that can affect all users interacting with the compromised system. The stored nature of this vulnerability means that once malicious SVG content is uploaded and processed, the payload remains active in the application's database or storage, executing automatically whenever users access the affected resources. This particular vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws, and aligns with ATT&CK technique T1531 which focuses on the use of malicious files to establish persistent access. The impact is significant as SVG files are commonly used for images and graphics, making them a likely target for exploitation. When users view pages containing the malicious SVG content, their browsers execute the embedded scripts, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability's exploitation requires minimal user interaction beyond viewing the compromised content, making it particularly dangerous in environments where users frequently upload or view SVG files.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization of SVG files within the dzzoffice application's upload handling mechanism. The index.php endpoint processes uploaded files without adequately filtering or escaping potentially dangerous script content embedded within SVG documents, particularly in the metadata or embedded script sections of these files. This processing flaw allows attackers to inject JavaScript code directly into SVG files that are then stored and served to other users. The vulnerability is particularly concerning because SVG files are inherently XML-based and support scripting capabilities, including embedded javascript within the <script> tags. The application's failure to properly validate the structure and content of these SVG files creates an attack surface where malicious actors can embed XSS payloads that execute in the victim's browser context. The stored nature of the vulnerability means that even if the initial upload occurs in a controlled environment, the malicious content persists and executes whenever legitimate users access the application's interface. This vulnerability also demonstrates a lack of proper content security policies and input validation mechanisms, as the system should have implemented strict sanitization of uploaded files to prevent execution of embedded scripts.
The operational impact of CVE-2024-29273 extends beyond simple script execution, potentially enabling attackers to compromise entire user sessions and access sensitive data within the dzzoffice application. When successful, this vulnerability can facilitate session hijacking attacks where attackers steal user authentication tokens and impersonate legitimate users to perform unauthorized actions. The stored nature of the vulnerability also allows for the creation of persistent backdoors or command and control channels that can be used for extended access to the compromised system. Additionally, the vulnerability may enable attackers to redirect users to phishing sites or inject malicious advertisements, leading to further security breaches and potential data exfiltration. The impact is particularly severe in enterprise environments where dzzoffice may be used for document management, collaboration, or administrative functions, as attackers could gain access to sensitive business information or manipulate critical system operations. The vulnerability also poses risks to user privacy and data integrity, as it could be exploited to capture keystrokes, access local storage, or perform other malicious activities that compromise user security. Organizations utilizing this version of dzzoffice should consider the potential for lateral movement within their networks if attackers use this vulnerability to gain initial access to the system.
Mitigation strategies for CVE-2024-29273 must address both immediate remediation and long-term security improvements within the dzzoffice application. The most critical immediate action is to implement proper input validation and sanitization of all uploaded SVG files, ensuring that any embedded scripts or malicious content is removed or neutralized before storage. This includes implementing strict XML parsing rules that reject or sanitize SVG files containing dangerous elements or attributes. Organizations should also implement Content Security Policy (CSP) headers that restrict script execution and prevent the loading of external resources. Regular security updates and patches should be applied to ensure the application remains protected against known vulnerabilities, with particular attention to the specific version mentioned in the CVE. Additionally, implementing proper file type validation and extension checking can prevent the upload of potentially dangerous file formats. Network monitoring should be enhanced to detect and alert on suspicious file upload activities, particularly those involving SVG files. Access controls should be reviewed and strengthened to limit upload capabilities to only authorized users, and the principle of least privilege should be enforced. Organizations should also conduct regular security assessments and penetration testing to identify similar vulnerabilities in other applications and systems. The implementation of web application firewalls and security scanning tools can provide additional layers of protection against exploitation attempts, while user education regarding the risks of uploading unknown files can help reduce successful attack vectors. Proper logging and audit trails should be maintained to track all file upload activities and enable incident response capabilities when vulnerabilities are exploited.