CVE-2018-1383 in AIX
Summary
by MITRE
A software logic bug creates a vulnerability in an AIX 6.1, 7.1, and 7.2 daemon which could allow a user with root privileges on one system, to obtain root access on another machine. IBM X-force ID: 138117.
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Analysis
by VulDB Data Team • 02/03/2021
This vulnerability resides in the AIX operating system daemon implementations across versions 6.1, 7.1, and 7.2, representing a critical privilege escalation flaw that fundamentally undermines system security boundaries. The software logic bug manifests within the daemon's authorization mechanisms, creating an unexpected pathway for privilege elevation that bypasses normal access controls. This vulnerability specifically affects systems where root privileges have been compromised on one machine, enabling attackers to leverage this flaw to gain root access on a different system within the network infrastructure. The flaw operates at the daemon level, suggesting it involves core system services that handle inter-system communications or authentication processes. This type of vulnerability falls under CWE-284 which addresses improper access control, and more specifically relates to CWE-782 which deals with exposed service that should be protected. The attack vector implies that an adversary who has already achieved root access on one system can exploit this logic error to extend their control to other systems, effectively creating a lateral movement capability that violates fundamental security principles of system isolation. The vulnerability represents a significant concern for enterprise environments where AIX systems are deployed, as it essentially allows for the compromise of multiple systems through a single successful attack.
The technical nature of this flaw suggests a failure in the daemon's implementation of inter-process communication or remote execution mechanisms. The daemon likely contains a logic error in how it validates incoming requests or handles authentication tokens, allowing an attacker with root privileges to manipulate the system into executing privileged operations against other machines. This could involve improper validation of remote procedure call parameters, flawed session management, or insecure handling of system-level commands that should only be executable from local contexts. The vulnerability's presence in multiple AIX versions indicates it's a persistent flaw in the daemon implementation architecture rather than a one-time coding error. Attackers exploiting this vulnerability would typically need to establish a root session on the initial system, then leverage the daemon's faulty logic to execute commands that would normally require authentication against target systems. This pattern aligns with ATT&CK technique T1078 which covers valid accounts and privilege escalation, though the specific implementation here involves a software flaw rather than account compromise. The daemon's behavior likely includes some form of remote execution or system command invocation that doesn't properly enforce authorization boundaries, creating the logical loophole that allows cross-system privilege escalation.
The operational impact of this vulnerability extends far beyond the immediate compromise of individual systems, as it fundamentally undermines the security model of distributed AIX environments. Organizations deploying AIX systems in enterprise or mission-critical environments face severe risks when this vulnerability exists, as it enables attackers to move laterally through networked systems without requiring additional authentication credentials. The vulnerability essentially creates a backdoor mechanism for privilege escalation that bypasses traditional security controls, potentially allowing attackers to compromise entire network segments with minimal additional effort. This type of vulnerability is particularly dangerous in environments where AIX systems handle sensitive data or critical infrastructure components, as it provides an automated path for attackers to escalate privileges and access protected resources across multiple machines. The impact on system availability and data integrity is significant, as attackers can potentially disable security mechanisms, modify system configurations, or extract sensitive information from multiple systems simultaneously. Organizations may face regulatory compliance issues if this vulnerability is exploited, particularly in industries with strict data protection requirements, as it represents a fundamental failure in system security architecture. The vulnerability's persistence across multiple AIX versions suggests that organizations running any of these versions are at risk, regardless of their patch management practices, as the flaw exists in the core daemon implementations.
Mitigation strategies for this vulnerability require immediate action from system administrators and security teams to address the underlying daemon implementation issues. The primary recommendation involves applying the relevant IBM security patches and updates that specifically address the daemon logic bug in question, ensuring all AIX systems across versions 6.1, 7.1, and 7.2 are properly updated. Organizations should implement network segmentation to limit the potential impact of privilege escalation attacks, particularly by isolating systems that may be compromised through this vulnerability. Monitoring and logging of daemon activities should be enhanced to detect suspicious patterns in inter-system communications that might indicate exploitation attempts. System administrators should review and harden the daemon configurations to ensure that authentication mechanisms are properly enforced and that remote execution capabilities are restricted to authorized users and systems. The implementation of principle of least privilege should be strictly enforced, limiting the capabilities of daemon processes to reduce the potential impact of exploitation. Additionally, organizations should conduct comprehensive security assessments to identify other potential logic flaws in their system implementations and consider implementing intrusion detection systems that can identify anomalous behavior patterns associated with privilege escalation attempts. The vulnerability also highlights the importance of regular security code reviews and penetration testing to identify similar logic errors in system implementations before they can be exploited by adversaries. Network access controls should be strengthened to prevent unauthorized access to systems that may be vulnerable to this type of attack, particularly focusing on protecting systems that handle inter-system communications and authentication functions.