CVE-2017-14563 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 a "Read Access Violation on Block Data Move starting at STDUXPSFile!DllUnregisterServer+0x0000000000005311."
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Analysis
by VulDB Data Team • 11/17/2019
The vulnerability identified as CVE-2017-14563 affects STDU Viewer version 1.6.375, a document viewing application commonly used for reading xps files. This critical security flaw manifests through a memory corruption issue that occurs when processing specially crafted xps documents, creating a dangerous attack surface for malicious actors seeking to compromise systems. The vulnerability specifically resides within the STDUXPSFile.dll component which handles xps file processing, making it a prime target for exploitation in targeted attacks against unsuspecting users who may open malicious documents.
The technical root cause of this vulnerability stems from a read access violation during a block data move operation within the DllUnregisterServer function of the STDUXPSFile.dll module. This memory management flaw represents a classic buffer over-read condition where the application attempts to access memory locations beyond the allocated buffer boundaries during the file processing routine. The vulnerability occurs at offset 0x0000000000005311 within the DllUnregisterServer function, indicating a precise memory access violation that can be reliably triggered through carefully constructed malicious xps files. This type of memory corruption vulnerability falls under the CWE-125 weakness category, which specifically addresses out-of-bounds read conditions that can lead to arbitrary code execution or system instability.
The operational impact of this vulnerability extends far beyond simple denial of service scenarios, as it provides attackers with the capability to execute arbitrary code on vulnerable systems with the privileges of the user running the application. When a user opens a crafted xps file, the memory corruption triggers a cascade of system instability that can result in application crashes, system hangs, or more critically, complete system compromise. The vulnerability's potential for remote code execution makes it particularly dangerous in enterprise environments where users may inadvertently open malicious documents from untrusted sources, potentially leading to full system compromise and lateral movement within network infrastructures. According to ATT&CK framework, this vulnerability maps to technique T1203 (Exploitation for Client Execution) and T1059 (Command and Scripting Interpreter) as attackers can leverage this flaw to establish persistent access and execute malicious payloads.
Mitigation strategies for CVE-2017-14563 should prioritize immediate patch deployment from the vendor, as the vulnerability has been addressed through software updates that correct the memory management issues in the affected xps processing components. Organizations should implement strict file validation policies that prevent automatic execution of xps files from untrusted sources, while also considering application whitelisting solutions to restrict execution of potentially vulnerable applications. Network segmentation and user access controls should be enforced to limit the potential impact of successful exploitation attempts, and regular security awareness training should be conducted to educate users about the dangers of opening suspicious document files. Additionally, implementing behavioral monitoring solutions that can detect anomalous memory access patterns during document processing may provide early warning capabilities for exploitation attempts. The vulnerability demonstrates the critical importance of proper memory management practices in document processing applications and highlights the necessity of thorough code review and security testing for all file handling components in enterprise software solutions.