CVE-2017-14306 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 .jb2 file, related to a "Read Access Violation starting at STDUJBIG2File!DllUnregisterServer+0x0000000000006e10."
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 11/15/2019
The vulnerability identified as CVE-2017-14306 affects STDU Viewer version 1.6.375, a document viewing application that processes various file formats including the jb2 format. This issue represents a critical memory corruption flaw that arises when the application attempts to process maliciously crafted .jb2 files. The vulnerability manifests as a read access violation within the STDUJBIG2File.dll component, specifically occurring at the DllUnregisterServer function offset 0x0000000000006e10, indicating a severe issue in the application's handling of untrusted input data.
The technical nature of this vulnerability stems from insufficient input validation and memory management within the STDU Viewer's JB2 file processing module. When a malicious .jb2 file is loaded, the application's parser fails to properly validate the file structure, leading to a situation where memory access violations occur during the DLL unregistering process. This type of vulnerability falls under CWE-125: Uninitialized Memory Read, which is classified as a memory safety issue where the program reads from uninitialized memory locations, potentially causing unpredictable behavior and system instability. The vulnerability demonstrates characteristics of a buffer over-read condition where the application attempts to access memory beyond the allocated bounds, creating opportunities for exploitation.
The operational impact of this vulnerability extends beyond simple denial of service, as the unspecified other impacts mentioned in the CVE description suggest potential for more severe consequences. An attacker could leverage this flaw to execute arbitrary code or cause system crashes that might lead to complete application compromise. The vulnerability is particularly concerning because it operates at the DLL level, meaning successful exploitation could potentially affect the entire system's stability and security posture. The attack vector is straightforward, requiring only the delivery of a malicious .jb2 file to the target system, making it an attractive target for threat actors seeking to exploit unpatched systems. This vulnerability aligns with ATT&CK technique T1203: Exploitation for Client Execution, which describes how attackers use vulnerabilities in software to execute malicious code on target systems.
Mitigation strategies for this vulnerability should include immediate patching of the STDU Viewer application to version 1.6.375.1 or later, which contains the necessary fixes for the memory handling issues. Organizations should implement strict file validation policies that prevent users from opening untrusted .jb2 files, particularly in enterprise environments where the application might be used in sensitive contexts. Network segmentation and application whitelisting can provide additional layers of protection by limiting the potential impact of exploitation. Security monitoring should be enhanced to detect unusual file processing patterns that might indicate exploitation attempts. The vulnerability also highlights the importance of regular security assessments and vulnerability management programs, as it demonstrates how seemingly minor input validation issues can lead to significant security risks. System administrators should also consider implementing sandboxing mechanisms for document processing applications to contain potential exploitation attempts within isolated environments.