CVE-2015-6097 in Windows
Summary
by MITRE
Heap-based buffer overflow in Windows Journal in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allows remote attackers to execute arbitrary code via a crafted Journal (.jnt) file, aka "Windows Journal Heap Overflow Vulnerability."
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Analysis
by VulDB Data Team • 11/18/2024
The CVE-2015-6097 vulnerability represents a critical heap-based buffer overflow affecting Microsoft Windows Journal component across multiple operating system versions including Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1. This vulnerability resides within the Windows Journal application which is designed to capture and store handwritten notes and drawings in digital format. The flaw manifests when the application processes maliciously crafted .jnt files, which are the native file format for Windows Journal documents. The buffer overflow occurs in the heap memory management system where insufficient bounds checking allows an attacker to write beyond allocated memory boundaries, potentially corrupting adjacent memory structures and executing arbitrary code with the privileges of the targeted user.
This vulnerability operates through a classic heap overflow exploitation pattern where attacker-controlled data is processed by the vulnerable Windows Journal component without proper input validation. The technical implementation involves the application's failure to properly validate the size and structure of elements within the .jnt file format during parsing operations. When the malicious file is opened, the application attempts to allocate memory for processing the file contents, but due to inadequate boundary checks, the overflow occurs in the heap memory space. This type of vulnerability falls under CWE-121, heap-based buffer overflow, and can be categorized as a memory safety error that violates fundamental security principles of input validation and memory management. The attack vector requires remote code execution through a specially crafted file that, when opened by an unsuspecting user, triggers the vulnerable code path in the Windows Journal application.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass significant security implications for enterprise environments and individual users. Attackers can leverage this vulnerability to gain unauthorized access to systems, escalate privileges, and potentially establish persistent backdoors through the executed malicious code. The vulnerability's remote exploitability means that attackers can deliver malicious .jnt files through various channels including email attachments, web downloads, or malicious websites without requiring local access to the target system. According to ATT&CK framework, this vulnerability maps to techniques involving execution through file and content manipulation, specifically T1059.007 for command and script interpreter and T1204.002 for user execution. The vulnerability affects systems running multiple Windows versions simultaneously, creating a broad attack surface that makes it particularly dangerous for organizations with mixed operating system environments.
Mitigation strategies for CVE-2015-6097 should include immediate deployment of Microsoft security patches and updates as part of standard vulnerability management protocols. Organizations should implement strict file type filtering and user education programs to prevent opening suspicious .jnt files from untrusted sources. Network-based protections such as email filtering and web proxies should be configured to block .jnt file downloads and attachments. System administrators should consider disabling Windows Journal functionality entirely if it is not required for business operations, using group policy settings to prevent execution of the vulnerable component. The vulnerability's classification as a heap-based buffer overflow indicates that memory protection mechanisms like DEP and ASLR should be properly configured to make exploitation more difficult. Additionally, regular vulnerability assessments and penetration testing should be conducted to identify similar memory safety issues in other applications and system components. Organizations should also consider implementing application whitelisting policies to restrict execution of only trusted applications, reducing the attack surface for such memory corruption vulnerabilities.