CVE-2012-1166 in Linux
Summary
by MITRE
The default keybindings for wwm in LTSP Display Manager (ldm) 2.2.x before 2.2.7 allow remote attackers to execute arbitrary commands via the KP_RETURN keybinding, which launches a terminal window.
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Analysis
by VulDB Data Team • 03/21/2021
The vulnerability identified as CVE-2012-1166 resides within the LTSP Display Manager (ldm) version 2.2.x prior to 2.2.7, specifically affecting the wwm component responsible for window management. This flaw represents a critical security oversight that enables remote attackers to execute arbitrary commands on affected systems through a seemingly innocuous keybinding mechanism. The vulnerability manifests through the default KP_RETURN keybinding configuration, which when triggered, launches a terminal window with elevated privileges, creating an attack vector that bypasses normal authentication and authorization controls.
The technical implementation of this vulnerability stems from improper input validation and privilege escalation within the window manager's keyboard handling subsystem. When the KP_RETURN keybinding is activated, the system fails to properly sanitize or restrict the command execution context, allowing attackers to inject malicious commands that execute with the privileges of the running display manager process. This represents a classic command injection vulnerability that operates at the system level rather than through traditional application interfaces, making it particularly dangerous as it can be exploited remotely without requiring local system access or authentication credentials. The flaw aligns with CWE-78, which describes improper neutralization of special elements used in OS commands, and demonstrates how default configurations can create inherent security weaknesses.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise, as the executed commands can manipulate system resources, access sensitive data, or establish persistent access points. Attackers can leverage this vulnerability to gain unauthorized access to network services, modify system configurations, or deploy malware directly through the terminal window launched by the compromised keybinding. The remote exploit capability means that attackers do not need physical access to the target system, making this vulnerability particularly concerning for networked environments where display managers are exposed to external networks. This vulnerability directly maps to ATT&CK technique T1059.001, which covers command and scripting interpreter execution, and represents a significant threat to system integrity and confidentiality.
Mitigation strategies for CVE-2012-1166 require immediate patching of the affected LTSP Display Manager versions to 2.2.7 or later, where the vulnerable keybinding configurations have been corrected. System administrators should also review and modify default keybindings to disable or restrict the KP_RETURN functionality in the wwm component, ensuring that terminal launching operations require explicit user authentication and verification. Additionally, network segmentation and access controls should be implemented to limit exposure of affected systems to untrusted networks, while regular security audits should verify that no unauthorized modifications have been made to the display manager configurations. The vulnerability underscores the importance of secure configuration management and the principle of least privilege in system administration practices, particularly for components that handle user input and system-level operations.