CVE-2017-14571 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 @ 0x00000000049c024c called from STDUXPSFile!DllUnregisterServer+0x0000000000025706."
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Analysis
by VulDB Data Team • 11/17/2019
The vulnerability CVE-2017-14571 represents a critical security flaw in STDU Viewer version 1.6.375 that enables remote code execution and denial of service attacks through maliciously crafted .xps files. This vulnerability arises from improper input validation and memory handling within the application's processing of XPS (XML Paper Specification) documents, which are used for document presentation and printing. The flaw manifests as an illegal instruction violation occurring at a specific memory address within the STDUXPSFile.dll component, specifically during the DllUnregisterServer function execution.
The technical exploitation of this vulnerability occurs when a malicious XPS file is opened by the vulnerable STDU Viewer application. The crafted file contains malformed data that triggers an exception in the application's memory management routines, leading to a crash or potential code execution. The memory address 0x00000000049c024c indicates where the illegal instruction occurs, while the call stack shows the vulnerability originates from the DllUnregisterServer function in the STDUXPSFile module. This represents a classic buffer overflow or memory corruption vulnerability that allows attackers to manipulate program execution flow and potentially execute arbitrary code with the privileges of the affected user.
From an operational perspective, this vulnerability presents significant risk to organizations relying on STDU Viewer for document processing, particularly in environments where users may encounter untrusted documents. The impact extends beyond simple denial of service to potential system compromise, as successful exploitation could allow attackers to execute malicious code on target systems. The vulnerability affects both Windows desktop and server environments where the application is installed, making it particularly dangerous in enterprise settings. According to CWE classification, this vulnerability maps to CWE-119 Improper Restriction of Operations within the Buffer, which encompasses memory safety issues that can lead to arbitrary code execution. The ATT&CK framework categorizes this under T1203 Exploitation for Client Execution, as it leverages application vulnerabilities to execute code on victim systems.
Mitigation strategies for CVE-2017-14571 should prioritize immediate patching of the STDU Viewer application to the latest version that addresses this vulnerability. Organizations should implement strict document validation policies, particularly for XPS files received from external sources, and consider sandboxing or virtualization of document processing activities. Network-level controls such as content filtering and email scanning should be enhanced to prevent malicious XPS files from reaching end users. Additionally, security awareness training should emphasize the dangers of opening untrusted documents, while system monitoring should be configured to detect unusual application behavior or crashes that may indicate exploitation attempts. The vulnerability highlights the importance of keeping third-party applications updated and implementing defense-in-depth strategies to protect against similar exploitation vectors in other document processing software.