CVE-2003-0897 in Windows
Summary
by MITRE
"Shatter" vulnerability in CommCtl32.dll in Windows XP may allow local users to execute arbitrary code by sending (1) BCM_GETTEXTMARGIN or (2) BCM_SETTEXTMARGIN button control messages to privileged applications.
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Analysis
by VulDB Data Team • 04/07/2017
The CVE-2003-0897 vulnerability represents a critical privilege escalation flaw in the Windows XP operating system's CommCtl32.dll component, which serves as the foundation for common dialog boxes and button controls within the graphical user interface. This vulnerability operates under the broader category of software security flaws that exploit improper handling of user input within system-level components, specifically targeting the button control messaging system that applications use to communicate with the Windows user interface. The vulnerability's classification aligns with CWE-121, which addresses stack-based buffer overflow conditions, and it demonstrates how seemingly innocuous user interface interactions can become vectors for system compromise. The flaw exists in the way the system processes button control messages, particularly the BCM_GETTEXTMARGIN and BCM_SETTEXTMARGIN commands that are used to retrieve and set text margin properties for button controls within applications.
The technical exploitation of this vulnerability relies on the inherent design of Windows message passing mechanisms where privileged applications receive and process user input through window messages. When a local user crafts malicious button control messages and sends them to privileged applications, the CommCtl32.dll component fails to properly validate the input parameters, allowing for memory corruption that can be leveraged to execute arbitrary code with the privileges of the target application. This particular vulnerability operates under the ATT&CK framework's privilege escalation techniques, specifically targeting the "Exploitation for Privilege Escalation" tactic where attackers exploit software flaws to gain elevated system privileges. The vulnerability's exploitation requires local access and the ability to interact with privileged applications, making it particularly dangerous in environments where users might have limited access but can influence application behavior through legitimate user interface interactions.
The operational impact of CVE-2003-0897 extends beyond simple code execution, as it fundamentally undermines the security model of Windows XP applications that rely on proper message handling and input validation. Attackers can leverage this vulnerability to escalate privileges from standard user accounts to system-level access, potentially compromising entire systems and allowing for persistent access through the execution of malicious code with elevated privileges. The vulnerability affects applications that use button controls and are running with elevated privileges, making it particularly dangerous in corporate environments where administrative applications might be running in the background. This flaw demonstrates how the principle of least privilege can be violated through improper input validation in system components, creating a pathway for attackers to bypass security controls that should normally prevent unauthorized code execution.
Mitigation strategies for this vulnerability focus on both immediate patching and operational security improvements. Microsoft released security updates that addressed the underlying buffer overflow conditions in CommCtl32.dll, requiring system administrators to apply these patches promptly to prevent exploitation. Organizations should also implement application whitelisting and user access controls to limit which users can interact with privileged applications, thereby reducing the attack surface. The vulnerability highlights the importance of input validation in system-level components and demonstrates why regular security assessments and vulnerability management programs are essential for maintaining system security. Network segmentation and monitoring for unusual application behavior can help detect exploitation attempts, while regular security awareness training can prevent users from inadvertently enabling exploitation through social engineering or other attack vectors that might be combined with this vulnerability.