CVE-2011-2922 in ktsuss
Summary
by MITRE
ktsuss versions 1.4 and prior spawns the GTK interface to run as root. This can allow a local attacker to escalate privileges to root and use the "GTK_MODULES" environment variable to possibly execute arbitrary code.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 02/23/2024
The vulnerability identified as CVE-2011-2922 affects ktsuss versions 1.4 and earlier, presenting a significant privilege escalation risk within Linux desktop environments. This flaw resides in the application's design where it intentionally spawns its graphical user interface with root privileges, creating an attack surface that malicious users can exploit to gain elevated system access. The core issue manifests when the application executes with root permissions, allowing local adversaries to manipulate environment variables that influence the execution context of the graphical components.
The technical exploitation of this vulnerability leverages the GTK_MODULES environment variable, which serves as a mechanism for loading additional GTK modules into applications. When ktsuss runs with root privileges, any local attacker who can influence the execution environment can manipulate this variable to load malicious GTK modules. This creates a pathway for arbitrary code execution with root privileges, effectively bypassing normal user-level security controls. The vulnerability represents a classic case of insecure privilege management where unnecessary root execution creates opportunities for privilege escalation attacks.
From an operational perspective, this vulnerability poses a serious threat to desktop security environments where users may not be fully aware of the risks associated with running applications with elevated privileges. The attack requires local access to the system, making it particularly concerning in multi-user environments or when users have limited security awareness. The impact extends beyond simple privilege escalation to potentially allow full system compromise through the execution of arbitrary code, which could include malware installation, data exfiltration, or further exploitation of other system vulnerabilities.
The vulnerability aligns with CWE-276, which addresses improper privileges, and demonstrates how insecure default configurations can lead to privilege escalation. From an attack framework perspective, this vulnerability maps to several ATT&CK techniques including privilege escalation through environment variable manipulation and execution of malicious code in legitimate system processes. The issue also reflects broader security concerns around desktop application security where GUI components are executed with unnecessary elevated privileges.
Mitigation strategies for CVE-2011-2922 should focus on immediate patching of affected ktsuss versions, implementing proper privilege separation where GUI components run with minimal necessary privileges, and establishing robust environment variable validation. System administrators should consider implementing security policies that restrict the use of applications that spawn root processes unnecessarily. Additionally, monitoring for suspicious GTK_MODULES usage and implementing application whitelisting controls can help detect and prevent exploitation attempts. The fundamental fix requires updating to versions of ktsuss that properly separate user interface execution from root privileges, ensuring that graphical components operate with appropriate security boundaries to prevent unauthorized privilege escalation.