CVE-2022-24588 in Flatpress
Summary
by MITRE • 02/15/2022
Flatpress v1.2.1 was discovered to contain a cross-site scripting (XSS) vulnerability in the Upload SVG File function.
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Analysis
by VulDB Data Team • 02/18/2022
The vulnerability identified as CVE-2022-24588 represents a critical cross-site scripting flaw within Flatpress version 1.2.1, specifically affecting the Upload SVG File functionality. This issue arises from inadequate input validation and sanitization mechanisms within the content management system's file upload handler, creating a persistent security weakness that can be exploited by malicious actors to execute arbitrary JavaScript code within the context of a victim's browser session. The vulnerability manifests when users attempt to upload SVG files through the administrative interface, where the system fails to properly sanitize user-supplied SVG content, allowing attackers to embed malicious script tags that persist in the application's file storage and execution environment.
The technical exploitation of this vulnerability occurs through the manipulation of SVG file contents, where attackers can inject malicious JavaScript code within SVG elements that are subsequently rendered by web browsers. This flaw falls under CWE-79 which specifically addresses Cross-Site Scripting vulnerabilities in software applications, and aligns with ATT&CK technique T1566.001 which covers the exploitation of web application vulnerabilities for initial access. The vulnerability is particularly concerning because SVG files are commonly used for web graphics and are often processed without strict sanitization, making them ideal vectors for XSS attacks in content management systems that fail to properly validate file contents against malicious payloads.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to hijack user sessions, steal sensitive cookies, perform unauthorized administrative actions, and potentially escalate privileges within the Flatpress environment. When an authenticated user accesses a page containing the maliciously uploaded SVG file, the injected JavaScript executes automatically, providing attackers with a persistent foothold within the application. This vulnerability can be leveraged to create a full compromise of the Flatpress installation, potentially allowing attackers to modify content, access user data, or even gain shell access to the underlying server if additional vulnerabilities exist. The persistent nature of the vulnerability means that once exploited, the malicious code remains active until manually removed from the system.
Mitigation strategies for CVE-2022-24588 should include immediate implementation of proper input validation and output encoding for all user-supplied content, particularly SVG files. Organizations should enforce strict file type validation that rejects potentially dangerous content within SVG files, implement Content Security Policy headers to limit script execution, and ensure that all uploaded files undergo thorough sanitization processes. The recommended remediation involves upgrading to a patched version of Flatpress that addresses the XSS vulnerability in the Upload SVG File function, while also implementing additional security controls such as file content scanning, restricted upload permissions, and regular security audits of uploaded content. Security teams should also consider implementing web application firewalls to detect and block suspicious upload attempts, and establish proper monitoring for unauthorized file uploads that could indicate exploitation attempts.