CVE-2019-9963 in XnView
Summary
by MITRE
XnView MP 0.93.1 on Windows allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted file, related to ntdll!RtlFreeHeap.
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Analysis
by VulDB Data Team • 08/04/2023
The vulnerability identified as CVE-2019-9963 affects XnView MP version 0.93.1 on Windows operating systems and represents a critical security flaw that can be exploited remotely by attackers to cause application instability or potentially more severe consequences. This vulnerability specifically manifests when the application processes maliciously crafted files, leading to a denial of service condition through application crash or system instability. The technical root cause of this issue is embedded within the ntdll!RtlFreeHeap function, which is a core Windows kernel component responsible for memory management operations. When XnView MP encounters a specially crafted file, the application's memory handling routines trigger improper behavior within the Windows heap management system, causing the application to crash or potentially execute unintended code.
The operational impact of this vulnerability extends beyond simple denial of service as it represents a potential vector for more sophisticated attacks that could leverage the heap corruption to achieve arbitrary code execution or privilege escalation. This type of vulnerability falls under the CWE-122 category of "Heap-based Buffer Overflow" and aligns with ATT&CK technique T1059.007 for command and scripting interpreter. The flaw demonstrates how improper input validation in multimedia processing applications can create exploitable conditions within the underlying operating system's memory management subsystem. Attackers could potentially craft malicious image files that, when opened by an unsuspecting user, would trigger the vulnerable code path and result in application termination or system instability.
Mitigation strategies for this vulnerability should prioritize immediate patching of XnView MP to version 0.94 or later, which contains the necessary fixes for the heap management issue. System administrators should implement strict file validation policies and consider deploying sandboxing mechanisms for processing untrusted image files. Network-level protections such as web application firewalls and content filtering solutions can help prevent malicious files from reaching end users. Additionally, users should be educated about the risks of opening untrusted files from unknown sources, and organizations should establish secure file handling procedures that include automated scanning for potentially malicious content. The vulnerability highlights the importance of proper memory management practices in multimedia applications and the need for comprehensive input validation to prevent exploitation of underlying operating system components.