CVE-2017-14569 in STDU Viewer
Summary
by MITRE
STDU Viewer 1.6.375 allows attackers to cause a denial of service or possibly have unspecified other impact via a crafted .xps file, related to a "Read Access Violation starting at STDUXPSFile!DllUnregisterServer+0x0000000000005bd5."
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Analysis
by VulDB Data Team • 11/17/2019
The vulnerability identified as CVE-2017-14569 affects STDU Viewer version 1.6.375, a document viewing application that processes XPS (XML Paper Specification) files. This vulnerability represents a critical security flaw that could enable remote attackers to disrupt system operations or potentially execute arbitrary code through the manipulation of specially crafted XPS documents. The issue stems from improper input validation and memory management within the application's handling of XPS file formats, specifically when processing certain file structures that trigger memory access violations during the file processing lifecycle.
The technical root cause of this vulnerability manifests as a read access violation occurring at the memory address STDUXPSFile!DllUnregisterServer+0x0000000000005bd5, indicating that the flaw exists within the dynamic link library responsible for XPS file handling and registration within the application's component architecture. This type of memory access violation typically occurs when the application attempts to read from a memory location that has not been properly allocated or has already been freed, creating a condition where the program's execution flow becomes unpredictable and potentially exploitable. The vulnerability classifies under CWE-125, which represents "Out-of-bounds Read" conditions that can lead to information disclosure, system crashes, or potential code execution depending on the specific memory access pattern.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as the unspecified other impacts suggest potential for more severe consequences including arbitrary code execution or privilege escalation. Attackers could craft malicious XPS files that, when opened by an unsuspecting user, would trigger the memory access violation and potentially provide a foothold for further exploitation within the target system. The vulnerability's exploitation requires minimal user interaction, as simply opening the malicious file within STDU Viewer would be sufficient to trigger the exploit, making it particularly dangerous in targeted attack scenarios or when deployed through social engineering campaigns.
From a cybersecurity perspective, this vulnerability aligns with ATT&CK technique T1203, "Exploitation for Client Execution," where adversaries leverage application vulnerabilities to execute code on target systems. The attack surface is particularly concerning given that XPS files are commonly used for document sharing and printing operations, making them a likely vector for exploitation in enterprise environments. Organizations using STDU Viewer should consider implementing strict file validation policies and network segmentation to limit potential exploitation. The recommended mitigations include immediate patching of the application to version 1.6.376 or later, which addresses the memory access violation through improved input validation and memory management routines. Additionally, users should be educated about the risks of opening untrusted XPS files and organizations should consider implementing sandboxing mechanisms for document processing to contain potential exploits within isolated environments, preventing broader system compromise.