CVE-2013-5598 in Firefox
Summary
by MITRE
PDF.js in Mozilla Firefox before 25.0 and Firefox ESR 24.x before 24.1 does not properly handle the appending of an IFRAME element, which allows remote attackers to read arbitrary files or execute arbitrary JavaScript code with chrome privileges by using this element within an embedded PDF object.
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Analysis
by VulDB Data Team • 11/25/2025
The vulnerability identified as CVE-2013-5598 represents a critical security flaw in Mozilla Firefox's PDF.js implementation that existed across multiple versions including Firefox 24.x and earlier. This vulnerability stems from improper handling of IFRAME elements within embedded PDF objects, creating a dangerous privilege escalation vector that allows remote attackers to execute arbitrary code with chrome privileges. The flaw specifically manifests when PDF.js processes PDF documents containing embedded IFRAME elements, enabling malicious actors to leverage this weakness to access sensitive system resources and execute unauthorized operations.
The technical nature of this vulnerability aligns with CWE-20, which describes improper input validation, and more specifically with CWE-74, representing injection flaws in the context of PDF processing. The flaw operates through a cross-origin resource access mechanism where the IFRAME element allows unauthorized access to chrome-level privileges, effectively bypassing the security boundaries that normally protect browser components from external content manipulation. This vulnerability exploits the trust relationship between PDF.js and the browser's rendering engine, enabling attackers to inject malicious code that can access file system resources and execute arbitrary JavaScript commands.
The operational impact of this vulnerability is severe as it allows remote attackers to perform privilege escalation attacks that could lead to complete system compromise. An attacker could potentially read arbitrary files from the local file system, access sensitive user data, and execute malicious code with the full privileges of the browser's chrome environment. This capability enables sophisticated attacks such as credential theft, system reconnaissance, and persistence mechanisms that could remain undetected for extended periods. The vulnerability affects not only individual user systems but also enterprise environments where PDF documents are frequently shared and processed, creating widespread potential for exploitation.
Mitigation strategies for CVE-2013-5598 primarily involve upgrading to affected versions of Firefox that contain the necessary security patches, specifically Firefox 25.0 and Firefox ESR 24.1 or later. Organizations should implement immediate patch management procedures to ensure all affected systems receive updates promptly. Additional protective measures include disabling PDF.js functionality in browsers when not required, implementing web application firewalls that can detect and block suspicious PDF content, and establishing monitoring procedures to identify potential exploitation attempts. Security teams should also consider implementing browser hardening configurations that restrict IFRAME functionality and limit the ability of embedded content to access privileged resources. The vulnerability demonstrates the importance of maintaining current security patches and highlights the risks associated with complex browser components that handle external content processing.