CVE-2022-29351 in TiddlyWiki5
Summary
by MITRE • 05/16/2022
An arbitrary file upload vulnerability in the file upload module of Tiddlywiki5 v5.2.2 allows attackers to execute arbitrary code via a crafted SVG file.
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Analysis
by VulDB Data Team • 08/03/2024
The vulnerability CVE-2022-29351 represents a critical arbitrary file upload flaw within the file upload module of Tiddlywiki5 version 5.2.2, classified under CWE-434 as insecure file upload handling. This vulnerability stems from insufficient validation of file types during the upload process, specifically failing to properly sanitize SVG file content that could contain malicious embedded code. The issue arises because Tiddlywiki5 accepts SVG files without adequate restrictions on their content, allowing attackers to upload crafted SVG files that may include embedded javascript or other malicious code execution vectors. The vulnerability affects the core file upload functionality that enables users to add media files to the wiki environment, creating a pathway for remote code execution through the exploitation of improperly validated file uploads.
The technical exploitation of this vulnerability occurs when an attacker uploads a specially crafted SVG file that contains embedded malicious code within its structure. SVG files are inherently XML-based and support scripting capabilities through embedded javascript, which can be executed when the file is rendered or processed by the web application. In the context of Tiddlywiki5, when such a malicious SVG file is uploaded and subsequently processed, the embedded code can execute within the context of the web server, potentially allowing attackers to execute arbitrary commands on the server. This vulnerability operates at the intersection of web application security and file processing, where the application fails to properly validate or sanitize uploaded content before storing or rendering it. The flaw represents a classic case of insufficient input validation and improper file type handling that enables attackers to bypass normal security controls.
The operational impact of CVE-2022-29351 extends beyond simple privilege escalation to encompass full system compromise and persistent access. Successful exploitation allows attackers to execute arbitrary code on the affected server, potentially leading to complete system takeover, data exfiltration, and lateral movement within the network. The vulnerability can be exploited through a straightforward upload attack without requiring authentication, making it particularly dangerous in environments where Tiddlywiki5 is publicly accessible. Organizations running vulnerable versions face risks including unauthorized access to sensitive data, server compromise, and potential use as a foothold for further attacks within their infrastructure. The attack surface is broad as any user with upload privileges can potentially exploit this vulnerability, making it a significant concern for collaborative environments where multiple users have access to the wiki system.
Mitigation strategies for CVE-2022-29351 should focus on implementing comprehensive file validation and sanitization measures. Organizations should immediately upgrade to Tiddlywiki5 version 5.2.3 or later, which contains the necessary patches to address this vulnerability. Additionally, administrators should implement strict file type validation that rejects SVG files or applies rigorous sanitization to any uploaded SVG content. The implementation of content security policies, proper file extension validation, and removal of executable capabilities from uploaded files are essential defensive measures. According to ATT&CK framework, this vulnerability maps to T1059.007 for command and script interpreter, as attackers can execute code through the compromised system. Organizations should also consider implementing network segmentation, monitoring for suspicious upload activities, and regular security assessments to prevent exploitation. The vulnerability highlights the importance of proper input validation and the need for security-conscious development practices that address file handling vulnerabilities as outlined in OWASP Top Ten and other security standards.