CVE-2020-4747 in Connect:Direct for UNIX
Summary
by MITRE • 12/15/2020
IBM Connect:Direct for UNIX 6.1.0, 6.0.0, 4.3.0, and 4.2.0 can allow a local or remote user to obtain an authenticated CLI session due to improper authentication methods. IBM X-Force ID: 188516.
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Analysis
by VulDB Data Team • 12/18/2020
IBM Connect:Direct for UNIX versions 6.1.0, 6.0.0, 4.3.0, and 4.2.0 contain a critical authentication vulnerability that allows both local and remote attackers to establish authenticated command line interface sessions without proper credentials. This flaw stems from inadequate authentication mechanisms within the system's session management framework, creating a pathway for unauthorized access to administrative functions. The vulnerability represents a significant weakness in the software's security architecture, as it bypasses the normal authentication procedures that should validate user credentials before granting access to the command line interface. Attackers can exploit this issue to gain elevated privileges and execute arbitrary commands on the system, potentially leading to complete system compromise. The flaw manifests when the system fails to properly validate authentication tokens or credentials during the CLI session establishment process, allowing unauthorized users to impersonate legitimate authenticated users. This vulnerability directly maps to CWE-287, which addresses improper authentication issues in software systems, and aligns with ATT&CK technique T1078.004 for valid accounts and T1566.001 for spearphishing attachments, as the compromised system could serve as a foothold for further attacks. The impact extends beyond simple unauthorized access, as successful exploitation could enable attackers to manipulate data flows, modify system configurations, or exfiltrate sensitive information through the Connect:Direct file transfer capabilities. Organizations using these vulnerable versions face substantial risk of data breaches and system compromise, particularly in environments where Connect:Direct is used for critical file transfers and data integration processes.
The technical implementation of this vulnerability involves weaknesses in the authentication subsystem that processes CLI session requests. When users attempt to establish a command line session, the system should validate credentials through proper authentication channels before permitting access to administrative functions. However, the flawed implementation allows for session establishment even when authentication fails or when invalid credentials are provided. This authentication bypass occurs at multiple levels including session token validation, user credential verification, and access control enforcement. The vulnerability affects both local and remote access scenarios, meaning that attackers could exploit it through network connections or physical system access. The flaw is particularly concerning because it operates at the authentication layer, making it difficult to detect through standard network monitoring or intrusion detection systems. System administrators may not immediately recognize unauthorized access attempts since the sessions appear legitimate from the authentication perspective, creating a potential blind spot in security monitoring. The vulnerability's persistence across multiple versions indicates a fundamental design flaw rather than a simple coding error, suggesting that organizations running any of these affected versions require immediate remediation. This authentication weakness creates a chain reaction of potential security issues, as unauthorized access to the CLI interface provides attackers with direct access to the system's command execution capabilities and potentially sensitive configuration data.
Organizations affected by this vulnerability face significant operational risks including unauthorized data access, system compromise, and potential regulatory violations. The ability to establish authenticated CLI sessions without proper credentials creates a direct pathway for attackers to perform malicious activities such as data exfiltration, system modification, or deployment of additional malware. The vulnerability's impact is amplified in enterprise environments where Connect:Direct is used for critical file transfers and data integration processes, as compromised systems could disrupt business operations and compromise sensitive information. Security teams must consider the broader implications of this vulnerability, as it could serve as an entry point for more sophisticated attacks that leverage the compromised system as a pivot point for accessing other network resources. The lack of proper authentication validation creates a situation where attackers can remain undetected for extended periods, as their activities would appear to be legitimate authenticated sessions. This vulnerability directly impacts the confidentiality, integrity, and availability of systems using the affected IBM Connect:Direct versions, potentially violating compliance requirements for data protection and system security. The risk of exploitation is particularly high for organizations that do not maintain strict access controls or monitoring procedures for command line interfaces, as the vulnerability provides a straightforward method for unauthorized access. Recovery from exploitation would require thorough system auditing, credential rotation, and potential full system reinstallation to ensure complete removal of any attacker footholds.
Mitigation strategies for this vulnerability should focus on immediate remediation through official IBM patches and updates. Organizations must prioritize upgrading to versions of IBM Connect:Direct that address this authentication flaw, as no effective workarounds exist for the underlying authentication bypass issue. System administrators should implement strict access controls limiting CLI session access to only authorized personnel and establish comprehensive monitoring for unusual authentication patterns or unauthorized access attempts. Network segmentation and firewall rules should be configured to restrict access to Connect:Direct services to trusted networks and IP addresses, reducing the attack surface for remote exploitation. Security teams should conduct thorough vulnerability assessments to identify all systems running affected versions and prioritize remediation efforts based on risk exposure. Additionally, organizations should implement enhanced logging and monitoring for CLI session activities, ensuring that all authentication attempts and subsequent actions are properly recorded and analyzed for suspicious behavior. The implementation of multi-factor authentication for CLI access, where supported, should be considered as an additional protective measure. Regular security audits and penetration testing should be conducted to verify that the authentication mechanisms are functioning correctly and that no unauthorized access paths remain. Organizations should also develop incident response procedures specifically addressing this type of authentication bypass vulnerability, ensuring that security teams can quickly detect and respond to exploitation attempts. The remediation process should include comprehensive testing to verify that the patch or upgrade does not introduce compatibility issues with existing Connect:Direct workflows or integration with other systems.