CVE-2017-8422 in kauth
Summary
by MITRE
KDE kdelibs before 4.14.32 and KAuth before 5.34 allow local users to gain root privileges by spoofing a callerID and leveraging a privileged helper app.
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Analysis
by VulDB Data Team • 12/26/2024
The vulnerability described in CVE-2017-8422 represents a critical privilege escalation flaw within the KDE kdelibs and KAuth frameworks that affected versions prior to 4.14.32 and 5.34 respectively. This issue resides in the authentication and authorization mechanisms of the KDE desktop environment, specifically targeting how the system handles caller identification and privileged helper applications. The flaw enables local attackers to escalate their privileges from standard user level to root access through a carefully crafted spoofing attack that manipulates the caller identification process.
The technical implementation of this vulnerability stems from insufficient validation of caller identifiers within the KAuth framework, which is responsible for managing privileged operations in KDE environments. When a privileged helper application executes, it relies on callerID information to determine whether the requesting process has appropriate authorization levels. The vulnerability occurs because the system does not properly verify the authenticity of the callerID, allowing malicious local users to forge this identifier and trick the privileged helper into executing commands with elevated privileges. This type of flaw aligns with CWE-284, which addresses improper access control mechanisms, and specifically relates to weaknesses in authorization and authentication processes.
The operational impact of this vulnerability is severe as it provides local attackers with complete system compromise without requiring any network access or external attack vectors. Once exploited, the attacker gains root privileges that enable them to modify system files, install malicious software, create new user accounts, and potentially access all data on the system. The attack requires only local system access, making it particularly dangerous in multi-user environments where users may not be trusted. This vulnerability affects all KDE-based systems running affected versions, including various Linux distributions and other operating systems that utilize KDE components for desktop management and authentication services.
Mitigation strategies for CVE-2017-8422 focus primarily on upgrading to patched versions of kdelibs and KAuth components, specifically versions 4.14.32 and 5.34 or later. System administrators should immediately implement this update across all affected systems and verify that the patches have been successfully applied. Additionally, organizations should consider implementing additional security controls such as restricting local user access to privileged helper applications, monitoring for suspicious authentication patterns, and conducting regular security audits of KDE-related components. The vulnerability demonstrates the importance of proper caller identification validation in privilege escalation scenarios and aligns with ATT&CK technique T1068, which covers privilege escalation through the exploitation of system vulnerabilities. Organizations should also review their overall system hardening practices and ensure that authentication frameworks are properly configured to prevent unauthorized privilege escalation attempts.