CVE-2018-15546 in PrizmDoc
Summary
by MITRE
Accusoft PrizmDoc version 13.3 and earlier contains a Stored Cross-Site Scripting issue through a crafted PDF file.
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Analysis
by VulDB Data Team • 03/25/2020
The vulnerability identified as CVE-2018-15546 represents a critical security flaw in Accusoft PrizmDoc software version 13.3 and earlier, where a stored cross-site scripting vulnerability exists through crafted PDF file manipulation. This issue arises from insufficient input validation and sanitization mechanisms within the document processing pipeline, specifically when handling PDF files that contain malicious script code. The flaw allows an attacker to inject persistent malicious scripts into the system that can execute in the context of other users who view the affected documents, creating a significant risk for organizations relying on document processing capabilities. The vulnerability demonstrates a clear weakness in the application's security architecture where user-supplied content is not adequately sanitized before being stored or rendered within the system's interface.
The technical implementation of this vulnerability stems from the software's failure to properly validate and escape user-provided content during the PDF processing workflow. When a malicious PDF file is uploaded and processed by PrizmDoc, the system does not sufficiently filter or sanitize embedded script elements, allowing XSS payloads to be stored within the document database or processing environment. This stored nature of the vulnerability means that the malicious code persists and executes whenever the affected document is accessed or rendered by any user within the system. The flaw operates at the intersection of web application security and document processing, where the standard security controls designed to protect against dynamic script injection are bypassed through the PDF parsing and rendering components. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, and demonstrates how document processing systems can become attack vectors when proper input validation is absent.
The operational impact of this vulnerability extends beyond simple script execution to encompass potential data breaches, privilege escalation, and system compromise. An attacker who successfully exploits this vulnerability can execute malicious scripts in the context of authenticated users, potentially gaining access to sensitive information, modifying system configurations, or using stolen session tokens to impersonate legitimate users. The stored nature of the vulnerability means that the attack can persist long after the initial compromise, allowing for extended periods of unauthorized access and data exfiltration. Organizations utilizing PrizmDoc for document management, archiving, or processing may face significant security risks as any user who accesses the affected documents becomes a potential victim of the stored XSS attack. This vulnerability particularly affects enterprise environments where document sharing and collaboration are common practices, as the malicious code can propagate through normal document workflows and user interactions.
Mitigation strategies for CVE-2018-15546 must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities from emerging. The most direct solution involves updating to Accusoft PrizmDoc version 13.4 or later, which contains patches specifically designed to address the XSS vulnerability in the PDF processing pipeline. Organizations should also implement additional security controls such as web application firewalls that can detect and block malicious script payloads, enhanced input validation at multiple layers of the application architecture, and regular security scanning of uploaded documents. The implementation of content security policies and proper output encoding mechanisms can provide additional defense-in-depth measures to protect against exploitation attempts. Security teams should conduct comprehensive vulnerability assessments of their document processing workflows and establish secure coding practices that emphasize input validation and sanitization. This vulnerability highlights the importance of addressing security concerns in document processing systems and aligns with ATT&CK technique T1203 which covers exploitation for privilege escalation through web application vulnerabilities. Organizations should also consider implementing automated document sanitization processes and regular security training for personnel who handle document uploads to minimize the risk of successful exploitation.