CVE-2025-53391 in zulucrypt
Summary
by MITRE • 06/29/2025
The Debian zuluPolkit/CMakeLists.txt file for zuluCrypt through the zulucrypt_6.2.0-1 package has insecure PolicyKit allow_any/allow_inactive/allow_active settings that allow a local user to escalate their privileges to root.
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Analysis
by VulDB Data Team • 06/30/2025
The vulnerability identified as CVE-2025-53391 affects the Debian package zuluCrypt version 6.2.0-1 and specifically targets the PolicyKit configuration within the zuluPolkit/CMakeLists.txt file. This issue represents a critical privilege escalation vulnerability that allows local users to gain root access on affected systems. The flaw stems from improperly configured PolicyKit permissions that grant excessive privileges to unprivileged users during system operations. PolicyKit is a framework that controls system-wide privileges and determines which users can perform specific administrative tasks on Linux systems. When PolicyKit configurations contain overly permissive settings, they create attack vectors that malicious users can exploit to bypass normal security controls.
The technical flaw manifests in the insecure allow_any/allow_inactive/allow_active settings within the PolicyKit configuration files distributed with zuluCrypt. These settings are designed to control when and how users can execute privileged operations through the PolicyKit framework. The allow_any setting permits any user to perform certain actions without proper authentication, while allow_inactive and allow_active configurations control access based on session states. In this case, the configuration allows local users to perform privileged operations that should require authentication or administrative privileges. This misconfiguration creates a direct path for privilege escalation attacks where an unprivileged user can execute commands with root-level permissions simply by invoking specific zuluCrypt functions.
The operational impact of this vulnerability is severe as it enables local privilege escalation from standard user accounts to root access without requiring any special authentication credentials. Attackers can leverage this vulnerability to gain complete control over affected systems, potentially leading to data exfiltration, system compromise, or further lateral movement within network environments. The vulnerability affects systems running Debian packages that include zuluCrypt version 6.2.0-1 or earlier versions where the PolicyKit configuration has not been corrected. Since the flaw exists in the package configuration rather than the application code itself, any system administrator who installs or updates to the vulnerable package is immediately at risk. The vulnerability is particularly concerning because it requires no network access or external attack vectors, making it exploitable through local system compromise alone.
Mitigation strategies for this vulnerability should include immediate package updates from Debian repositories to obtain fixed versions of zuluCrypt that contain corrected PolicyKit configurations. System administrators should also implement monitoring to detect unauthorized privilege escalation attempts and verify that PolicyKit configurations have been properly applied. The fix typically involves modifying the CMakeLists.txt file to remove or restrict the insecure allow_any/allow_inactive/allow_active settings and replace them with appropriate security controls. Organizations should also consider implementing additional security measures such as mandatory access controls, regular system audits, and privilege separation mechanisms to reduce the potential impact of such vulnerabilities. This issue aligns with CWE-284 which addresses improper access control in software systems, and may map to ATT&CK technique T1068 which covers privilege escalation through local system exploitation.