CVE-2001-1027 in WindowMaker
Summary
by MITRE
Buffer overflow in WindowMaker (aka wmaker) 0.64 and earlier allows remote attackers to execute arbitrary code via a long window title.
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Analysis
by VulDB Data Team • 04/29/2019
The vulnerability identified as CVE-2001-1027 represents a critical buffer overflow flaw in WindowMaker window manager version 0.64 and earlier. This vulnerability resides within the window title handling mechanism of the WindowMaker desktop environment, which is a popular open-source window manager for the X Window System. The flaw manifests when the window manager processes window titles that exceed predetermined buffer size limits, creating an exploitable condition that can be leveraged by remote attackers to gain arbitrary code execution privileges. The vulnerability is classified as a classic stack-based buffer overflow, where insufficient input validation allows malicious data to overwrite adjacent memory locations, potentially corrupting program execution flow.
WindowMaker, also known as wmaker, is a lightweight window manager designed for the X Window System that provides a user interface for managing application windows on Unix-like operating systems. The buffer overflow occurs specifically in the window title processing code where the application fails to properly validate the length of window titles received from remote X11 clients. This vulnerability affects systems running WindowMaker 0.64 and earlier versions, making it particularly concerning given the widespread use of X Window System environments in Unix and Linux distributions. The flaw demonstrates poor input sanitization practices that violate fundamental security principles for memory management and data validation.
The operational impact of this vulnerability is severe and far-reaching, as it allows remote attackers to execute arbitrary code with the privileges of the WindowMaker process. This typically means that an attacker could gain control over the user's desktop session, potentially leading to complete system compromise. The vulnerability can be exploited through X11 network connections, making it accessible over network boundaries where X11 forwarding or remote desktop access is enabled. Attackers can craft malicious window titles that, when displayed by the vulnerable WindowMaker, trigger the buffer overflow condition. This creates a vector for privilege escalation attacks, remote code execution, and potential persistence mechanisms within desktop environments. The attack requires minimal privileges to initiate and can be automated, making it particularly dangerous in multi-user environments.
The technical implementation of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows data to overwrite adjacent memory. This flaw also maps to ATT&CK technique T1059, specifically the execution of malicious code through legitimate system processes. Mitigation strategies include immediate patching of WindowMaker to versions 0.65 or later where the buffer overflow has been addressed. System administrators should also implement X11 access controls, disable unnecessary X11 forwarding, and monitor for suspicious window title creation patterns. Additionally, network-level firewalls should restrict X11 traffic to trusted sources only. The vulnerability highlights the importance of proper input validation and memory management in GUI applications, particularly those that process untrusted data from network sources. Regular security audits of desktop environments and application code reviews should be conducted to prevent similar buffer overflow conditions from emerging in other components of the system.