CVE-2018-12472 in Linux SMT
Summary
by MITRE
A improper authentication using the HOST header in SUSE Linux SMT allows remote attackers to spoof a sibling server. Affected releases are SUSE Linux SMT: versions prior to 3.0.37.
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Analysis
by VulDB Data Team • 05/22/2023
The vulnerability identified as CVE-2018-12472 represents a critical authentication flaw within SUSE Linux SMT (SUSE Manager Tool) versions prior to 3.0.37. This issue stems from the improper handling of the HOST header during authentication processes, creating a significant security risk that allows remote attackers to impersonate legitimate sibling servers within the SUSE Linux environment. The vulnerability specifically affects the SUSE Linux SMT system which is designed to manage and monitor SUSE Linux Enterprise Server deployments across multiple systems. The flaw occurs when the system fails to properly validate or sanitize the HOST header value, enabling malicious actors to manipulate this header to gain unauthorized access to the management infrastructure.
The technical implementation of this vulnerability exploits the trust relationship between sibling servers in the SUSE Linux SMT architecture. When SUSE Linux SMT processes requests from other servers in the network, it relies on the HOST header to determine the authenticity and origin of these communications. The system incorrectly accepts and trusts the HOST header value without proper validation, allowing an attacker to craft malicious requests where the HOST header contains a spoofed value that matches a legitimate sibling server. This misconfiguration effectively bypasses the authentication mechanisms that should verify the identity of communicating servers, enabling unauthorized entities to establish false trust relationships with the SMT system. The vulnerability falls under CWE-287 which addresses improper authentication issues, specifically addressing the weakness where authentication mechanisms are not properly implemented or validated. The flaw creates a path for attackers to perform unauthorized server impersonation, potentially leading to complete compromise of the SUSE Linux management infrastructure.
The operational impact of this vulnerability extends beyond simple authentication bypass as it fundamentally undermines the security model of the SUSE Linux SMT system. An attacker who successfully exploits this vulnerability can gain access to sensitive management functions, potentially leading to unauthorized configuration changes, data exfiltration, or further lateral movement within the network. The compromised SMT system could be used to issue commands to managed servers, modify system configurations, or even create new server entries in the management database. This type of attack aligns with ATT&CK technique T1078 which covers valid accounts and legitimate credentials usage for persistence and privilege escalation. The vulnerability particularly affects organizations that rely heavily on SUSE Linux Enterprise Server deployments where centralized management through SMT is utilized, as it provides attackers with a potential entry point into the core infrastructure management layer.
Organizations should immediately implement mitigations including upgrading to SUSE Linux SMT version 3.0.37 or later, which contains the necessary patches to properly validate HOST headers during authentication processes. Additional defensive measures should include network segmentation to limit access to SMT management interfaces, implementing strict firewall rules that restrict communication between servers, and monitoring for unusual HOST header values in system logs. Security administrators should also consider implementing network-based intrusion detection systems that can identify suspicious HOST header patterns and alert on potential exploitation attempts. The vulnerability demonstrates the importance of proper input validation and authentication mechanism implementation as outlined in security best practices and standards such as those defined by NIST SP 800-53 and ISO 27001. Organizations should conduct thorough security assessments to identify any other systems that might be vulnerable to similar HOST header manipulation attacks, particularly those that rely on header-based authentication or trust relationships.