The HTTP interface of Tivoli Lightweight Client Framework (LCF) in IBM Tivoli Management Framework 3.7.1 sets http_disable to zero at install time, which allows remote authenticated users to bypass file permissions on Tivoli Endpoint Configuration data files via an unspecified manipulation of log files.
IBM Tivoli Management Framework 3.7.1 is vulnerable to a critical security flaw allowing remote authenticated users to bypass file permissions. This vulnerability, stemming from an insecure HTTP configuration, enables attackers to manipulate log files and potentially gain unauthorized access to sensitive configuration data, leading to system compromise.
Step 1: Authentication: The attacker authenticates to the Tivoli Management Framework using valid credentials. This is a prerequisite for exploiting the vulnerability.
Step 2: Log File Identification: The attacker identifies the location and name of relevant log files used by the LCF and the Endpoint Configuration system. These files store information about configuration changes and system events.
Step 3: Log File Manipulation: The attacker crafts malicious entries within the identified log files. These entries are designed to manipulate the Endpoint Configuration data. This could involve injecting commands or data that overwrite or modify configuration files.
Step 4: Triggering the Vulnerability: The attacker triggers the processing of the manipulated log files. This could be achieved by causing a specific event that forces the system to read and process the log files, such as a configuration update or a system restart.
Step 5: Configuration Data Access: The system processes the malicious log file entries, leading to the attacker's desired outcome: unauthorized access to or modification of Endpoint Configuration data. This could include reading sensitive configuration files or executing arbitrary commands.
The vulnerability lies in the default configuration of the Tivoli Lightweight Client Framework (LCF) within IBM Tivoli Management Framework 3.7.1. The http_disable setting is initialized to zero during installation, enabling the HTTP interface. This, combined with insufficient access controls on log files and the handling of Endpoint Configuration data, allows authenticated users to manipulate log files. The root cause is a flawed access control mechanism that fails to properly restrict access to configuration data based on user authentication. Specifically, the system does not adequately validate the integrity of log file entries, allowing an attacker to inject malicious commands or data that, when processed, leads to unauthorized file access. The lack of proper input validation and authorization checks on the log file processing logic is the core of the vulnerability.