CVE-2006-5842 in Unicore Client
Summary
by MITRE
The keystore file in Unicore Client before 5.6 build 5, when running on Unix systems, has insecure default permissions, which allows local users to obtain sensitive information.
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Analysis
by VulDB Data Team • 04/27/2026
The vulnerability described in CVE-2006-5842 represents a critical security flaw in the Unicore Client software ecosystem, specifically affecting versions prior to 5.6 build 5 on Unix operating systems. This issue stems from improper permission settings on the keystore file, which serves as a critical component for storing cryptographic keys and sensitive authentication data within the application's security infrastructure. The insecure default permissions create an exploitable condition that fundamentally undermines the confidentiality and integrity of the system's authentication mechanisms.
The technical implementation flaw manifests through the keystore file's default access controls, which typically should restrict read and write operations to authorized processes only. However, in affected versions of the Unicore Client, the keystore file is created with overly permissive permissions that allow any local user account to read the file contents. This configuration violates fundamental security principles of least privilege and proper access control enforcement. The keystore file contains sensitive cryptographic material including private keys, certificates, and authentication credentials that are essential for maintaining secure communications and user authentication within the application environment.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the means to escalate privileges and compromise the entire security posture of systems running the vulnerable software. Local users who gain access to the keystore file can extract cryptographic keys and authentication credentials, potentially enabling them to impersonate legitimate users, decrypt sensitive communications, or gain unauthorized access to protected resources. This vulnerability directly aligns with CWE-732: Incorrect Permission Assignment for Critical Resource, which specifically addresses the scenario where critical system resources are assigned insecure permissions that allow unauthorized access. The flaw also maps to ATT&CK technique T1552.001: Unsecured Credentials, as it exposes credential material through improper file permissions.
The implications of this vulnerability are particularly severe in enterprise environments where Unicore Client is deployed for secure communications and authentication services. Attackers can leverage this weakness to perform credential theft attacks, potentially leading to broader system compromise through lateral movement and privilege escalation. The vulnerability affects the confidentiality aspect of the CIA triad by exposing sensitive cryptographic material that should remain protected from unauthorized access. Organizations running affected versions of the Unicore Client should immediately implement mitigations including updating to version 5.6 build 5 or later, manually correcting the keystore file permissions, and conducting comprehensive security audits to identify any potential exploitation attempts. System administrators must ensure that all keystore files are created with restrictive permissions, typically limiting access to the specific user account or process that requires the cryptographic material, thereby preventing unauthorized local users from accessing sensitive information through default permission configurations.