CVE-2017-14568 in STDU Viewer
Summary
by MITRE
STDU Viewer 1.6.375 allows attackers to execute arbitrary code or cause a denial of service via a crafted .xps file, related to an "Illegal Instruction Violation starting at Unknown Symbol @ 0x000000000297024c called from STDUXPSFile!DllUnregisterServer+0x0000000000025630."
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 11/17/2019
The vulnerability identified as CVE-2017-14568 affects STDU Viewer version 1.6.375, a document viewing application that processes XPS (XML Paper Specification) files. This flaw represents a critical security weakness that can be exploited through maliciously crafted XPS files, potentially allowing remote code execution or denial of service conditions. The vulnerability manifests as an illegal instruction violation within the application's processing pipeline, specifically occurring at an unknown symbol address within the STDUXPSFile.dll module during the DllUnregisterServer function execution. This type of vulnerability falls under the category of heap-based buffer overflows and memory corruption issues that are particularly dangerous in document processing applications due to the complex parsing requirements of XPS format specifications.
The technical exploitation of this vulnerability occurs when the STDU Viewer application attempts to process a specially crafted XPS file that contains malformed data structures or malicious payloads. The illegal instruction violation happens during the DLL unregistering process, indicating that the application fails to properly validate or sanitize input data before attempting to execute operations within the XPS file processing module. This particular memory access violation at address 0x000000000297024c suggests that the application is attempting to execute code or access memory locations that are either invalid or unauthorized, leading to potential application crashes or more severe exploitation scenarios. The vulnerability is classified under CWE-125: Out-of-bounds Read, which is a common weakness in applications that fail to properly validate array indices or memory boundaries during processing of structured data formats.
From an operational perspective, this vulnerability presents significant risks to organizations that rely on STDU Viewer for document processing, particularly in environments where users might encounter untrusted XPS files from external sources. The potential for remote code execution means that attackers could gain full system control if they can convince users to open malicious documents, making this a high-severity issue that requires immediate attention. The denial of service component of this vulnerability can also be leveraged to disrupt business operations by causing the application to crash repeatedly, effectively preventing legitimate document processing activities. According to ATT&CK framework, this vulnerability maps to T1203: Exploitation for Client Execution and T1499: Endpoint Denial of Service, demonstrating both the execution and availability impact vectors. Organizations should note that this vulnerability affects the application's core functionality and can be exploited through social engineering tactics where users are tricked into opening malicious XPS documents.
Mitigation strategies for CVE-2017-14568 should focus on immediate remediation through software updates from the vendor, as the vulnerability exists within the application's core processing logic. System administrators should implement strict file validation policies that prevent automatic execution of XPS files from untrusted sources, and consider deploying application whitelisting solutions that restrict the execution of vulnerable applications until patches are applied. Network-based protections such as sandboxing XPS file processing or using dedicated document conversion services can help reduce the attack surface. Additionally, users should be educated about the risks of opening documents from unknown sources, and organizations should maintain up-to-date threat intelligence to identify potential exploitation attempts. The vulnerability also highlights the importance of input validation and proper memory management in document processing applications, making it essential for developers to implement robust error handling and boundary checking mechanisms in future versions. Security teams should monitor for exploitation attempts through network traffic analysis and application logs, particularly looking for unusual patterns in document processing activities that might indicate attempts to trigger this vulnerability.