CVE-2023-22856 in Blogengine.NET
Summary
by MITRE • 03/06/2023
A stored Cross-site Scripting (XSS) vulnerability in BlogEngine.NET 3.3.8.0, allows injection of arbitrary JavaScript in the security context of a blog visitor through an upload of a specially crafted file.
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Analysis
by VulDB Data Team • 03/06/2023
The stored cross-site scripting vulnerability identified as CVE-2023-22856 affects BlogEngine.NET version 3.3.8.0 and represents a critical security flaw that enables attackers to inject malicious JavaScript code into the application's security context. This vulnerability specifically manifests when users upload files that contain crafted malicious content, which then gets stored within the application's database or file system. The flaw stems from insufficient input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before it is rendered to other users. The vulnerability is categorized under CWE-79 as a failure to sanitize user input, which directly enables XSS attacks that can persist across multiple user sessions.
The technical implementation of this vulnerability occurs when BlogEngine.NET processes file uploads without adequate sanitization of file metadata or content that might contain script tags or other malicious payloads. Attackers can exploit this by uploading files with malicious JavaScript embedded in their names, descriptions, or metadata fields that are subsequently displayed on blog pages. When other users view these pages, the stored malicious scripts execute in their browser context with the privileges of the logged-in user, potentially enabling session hijacking, credential theft, or redirection to malicious sites. The attack vector operates through the application's file management functionality where file properties are not properly escaped when rendered to HTML output.
The operational impact of CVE-2023-22856 extends beyond simple script execution as it can enable sophisticated attack chains that leverage the persistent nature of stored XSS. An attacker who successfully exploits this vulnerability can establish a foothold within the blog's user base, potentially compromising multiple user accounts and gaining access to sensitive information. The vulnerability affects the application's security model by undermining the trust boundary between legitimate content and malicious input, allowing attackers to manipulate the application's behavior and potentially escalate privileges. This flaw particularly impacts organizations relying on BlogEngine.NET for content management, as it can lead to data breaches, reputational damage, and potential regulatory compliance violations.
Mitigation strategies for CVE-2023-22856 should focus on implementing robust input validation and output encoding mechanisms throughout the application's data flow. Organizations should ensure that all user-supplied content, particularly file metadata and descriptions, undergoes strict sanitization before being stored or rendered. The implementation of Content Security Policy headers can provide additional defense-in-depth measures to prevent execution of unauthorized scripts. Security patches should be applied immediately to upgrade to versions that address this vulnerability, while organizations should also implement proper file upload restrictions and content validation. Regular security testing including dynamic application security testing and manual penetration testing can help identify similar vulnerabilities in the application's codebase, aligning with ATT&CK technique T1566 for initial access through malicious file uploads. The vulnerability highlights the importance of secure coding practices and proper input validation as recommended in OWASP Top Ten and NIST cybersecurity frameworks.