CVE-2015-2516 in Windows
Summary
by MITRE
Windows Journal in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 allows remote attackers to cause a denial of service (data loss) via a crafted .jnt file, aka "Windows Journal DoS Vulnerability."
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Analysis
by VulDB Data Team • 06/14/2022
The Windows Journal DoS vulnerability identified as CVE-2015-2516 represents a critical security flaw affecting multiple versions of the Microsoft Windows operating system. This vulnerability specifically targets the Windows Journal component, which is designed to handle digital ink and pen-based note-taking functionality. The vulnerability arises from insufficient input validation when processing specially crafted .jnt files, which are the native file format used by Windows Journal for storing handwritten notes and annotations. The flaw exists in the parsing logic that handles these structured documents, making it susceptible to malformed input that can trigger unexpected behavior in the application.
The technical implementation of this vulnerability stems from a lack of proper boundary checking and input sanitization within the Windows Journal processing engine. When a maliciously crafted .jnt file is opened, the application fails to properly validate the file structure and content, leading to memory corruption or unexpected application termination. This behavior manifests as a denial of service condition where the Journal application crashes or becomes unresponsive, potentially resulting in data loss for users who had unsaved work in progress. The vulnerability can be exploited remotely through various attack vectors including email attachments, web downloads, or file sharing mechanisms, making it particularly dangerous in enterprise environments where users may inadvertently open malicious files.
The operational impact of CVE-2015-2516 extends beyond simple service disruption to potentially compromise user productivity and system integrity. Organizations using affected Windows versions face significant risks when users encounter malicious .jnt files, as these files can be disguised as legitimate documents or attachments. The vulnerability affects a wide range of Windows operating systems including legacy versions like Windows Vista and Server 2008, as well as newer releases such as Windows 8.1 and Windows 10, indicating a widespread exposure across the Microsoft ecosystem. From a threat modeling perspective, this vulnerability aligns with attack patterns documented in the MITRE ATT&CK framework under the T1203 category for "Exploitation for Data Destruction" and T1059 for "Command and Scripting Interpreter" when considering the potential for chained attacks. The vulnerability also maps to CWE-125, "Out-of-bounds Read," and CWE-20, "Improper Input Validation," which are fundamental security weaknesses that can lead to system instability and data loss.
Mitigation strategies for this vulnerability require immediate action from system administrators and security teams. Microsoft released security patches through regular Windows updates that address the input validation flaws in Windows Journal. Organizations should prioritize applying these patches across all affected systems, particularly in environments where users may encounter untrusted files from external sources. Additional protective measures include implementing email filtering and attachment scanning systems to prevent malicious .jnt files from reaching end users, disabling the Windows Journal component in enterprise environments where it is not required, and educating users about the dangers of opening unknown file attachments. Network segmentation and monitoring solutions should be deployed to detect potential exploitation attempts, as the vulnerability can be leveraged in combination with other attack vectors to create more sophisticated threats. The vulnerability also highlights the importance of maintaining up-to-date security practices and the need for regular vulnerability assessments to identify similar weaknesses in legacy applications and components that may be present in older Windows versions.