CVE-2013-3248 in PDF Fusion
Summary
by MITRE
Untrusted search path vulnerability in Corel PDF Fusion 1.11 allows local users to gain privileges via a Trojan horse wintab32.dll file in the current working directory, as demonstrated by a directory that contains a .pdf or .xps file.
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Analysis
by VulDB Data Team • 06/01/2025
The vulnerability identified as CVE-2013-3248 represents a classic untrusted search path issue affecting Corel PDF Fusion version 1.11. This flaw resides in the application's dynamic link library loading mechanism, where the software fails to properly validate the source of dynamically loaded libraries. The vulnerability specifically manifests when the application processes PDF or XPS files, creating a scenario where a malicious actor can exploit the trust relationship between the application and its runtime environment. The issue stems from the application's tendency to load libraries from the current working directory without sufficient validation of the library's authenticity or origin. This behavior creates a path traversal vulnerability that can be leveraged by local attackers to execute arbitrary code with elevated privileges.
The technical implementation of this vulnerability aligns with CWE-426, which describes the weakness of allowing untrusted libraries to be loaded with elevated privileges. When Corel PDF Fusion processes a document file, it may inadvertently load a malicious wintab32.dll file from the same directory containing the target document. This Trojan horse approach exploits the application's implicit trust in the current working directory, which is typically the location where the user initiated the application or where the document resides. The vulnerability is particularly concerning because it requires no special privileges to exploit, as the malicious DLL is loaded during normal application operation, and the privilege escalation occurs automatically when the application executes code from the compromised library.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and data exfiltration capabilities. Local attackers can leverage this vulnerability to execute malicious code with the privileges of the user running Corel PDF Fusion, which may include administrative rights depending on the system configuration. The attack vector is particularly insidious because it can be triggered simply by opening a malicious document, making it suitable for social engineering campaigns or automated exploitation. The vulnerability affects any system where Corel PDF Fusion is installed and where users may encounter untrusted documents, creating a broad attack surface that includes office environments, educational institutions, and enterprise networks.
Mitigation strategies for CVE-2013-3248 should focus on both immediate defensive measures and long-term architectural improvements. The most effective immediate solution involves applying the vendor-provided patch or upgrade to a version that addresses the untrusted search path vulnerability. Organizations should also implement application whitelisting policies that restrict the execution of unsigned or untrusted DLL files in critical application directories. Additionally, security configurations should enforce strict library loading paths and disable loading of libraries from the current working directory for applications that do not require this functionality. The vulnerability demonstrates the importance of following secure coding practices as outlined in the software security development lifecycle, particularly in ensuring that applications do not implicitly trust the current working directory for library loading operations. Network segmentation and privilege separation can further reduce the impact of successful exploitation by limiting the potential damage that can be achieved through privilege escalation.