CVE-2012-5617 in gksu-polkit
Summary
by MITRE
gksu-polkit: permissive PolicyKit policy configuration file allows privilege escalation
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Analysis
by VulDB Data Team • 02/27/2024
The vulnerability identified as CVE-2012-5617 resides within the gksu-polkit component of Linux systems, specifically targeting the PolicyKit authorization framework. This flaw manifests through a permissive policy configuration file that grants excessive privileges to unauthorized users, creating a critical security weakness in the system's privilege management mechanisms. The issue affects systems that utilize PolicyKit for managing user permissions and administrative access, particularly those employing gksu as a graphical frontend for privilege escalation.
The technical flaw stems from an improperly configured PolicyKit policy file that fails to enforce strict access controls for privileged operations. When gksu attempts to execute commands with elevated privileges, the PolicyKit configuration does not adequately verify user credentials or authorization levels, allowing any authenticated user to bypass normal security restrictions. This misconfiguration enables attackers to escalate their privileges without proper authentication, effectively undermining the entire privilege separation model that PolicyKit is designed to enforce. The vulnerability is particularly dangerous because it operates at the system level where users can execute commands with root privileges without proper verification.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to compromise entire systems through unauthorized administrative access. Once an attacker exploits this flaw, they can modify system files, install malicious software, create new user accounts, and access sensitive data without detection. The vulnerability affects systems where gksu is installed and configured to use PolicyKit for authorization, which includes many desktop environments and graphical user interfaces. This creates a significant risk for organizations that rely on graphical interfaces for system administration, as the attack surface becomes much larger than traditional command-line interfaces.
Mitigation strategies for CVE-2012-5617 involve multiple layers of security controls that address both the immediate policy configuration issue and broader system protection. System administrators should immediately review and tighten PolicyKit policy files to ensure that only authorized users can escalate privileges through gksu. The recommended approach includes implementing strict rule enforcement that requires explicit user authentication and authorization for all privileged operations. Additionally, organizations should consider disabling gksu if it is not essential for their operations, as this eliminates the attack vector entirely. Security frameworks such as the ATT&CK framework categorize this vulnerability under privilege escalation techniques, specifically targeting the use of misconfigured system components to gain elevated access. The CWE dictionary classifies this issue under CWE-276, which deals with incorrect permissions for critical resources, emphasizing the importance of proper access control implementation in system components.
Implementation of these mitigations requires careful system auditing to identify all instances of gksu-polkit configuration files and their associated policy rules. Organizations should also establish regular monitoring procedures to detect any unauthorized modifications to PolicyKit configurations, as attackers may attempt to maintain persistence through similar misconfigurations. The vulnerability highlights the critical importance of proper security configuration management and the need for comprehensive security testing of system components that handle privilege escalation. Regular security assessments should include verification of PolicyKit policies to ensure that access controls remain properly enforced and that no permissive configurations exist that could be exploited by malicious actors.