CVE-2018-17448 in SD-WAN
Summary
by MITRE
An Incorrect Access Control issue was discovered in Citrix SD-WAN 10.1.0 and NetScaler SD-WAN 9.3.x before 9.3.6 and 10.0.x before 10.0.4.
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Analysis
by VulDB Data Team • 04/06/2020
The vulnerability identified as CVE-2018-17448 represents a critical incorrect access control flaw affecting Citrix SD-WAN and NetScaler SD-WAN products. This issue stems from inadequate authorization mechanisms that allow unauthorized users to gain elevated privileges within the affected systems. The vulnerability specifically impacts versions 10.1.0 of Citrix SD-WAN and 9.3.x versions before 9.3.6, as well as 10.0.x versions before 10.0.4, creating a significant security gap that could be exploited by malicious actors to compromise network infrastructure. The flaw resides in the application's privilege management system where proper access controls fail to validate user credentials and permissions adequately.
The technical implementation of this access control vulnerability manifests through insufficient validation of administrative privileges within the SD-WAN management interfaces. Attackers can potentially exploit this weakness to bypass authentication mechanisms and assume administrative roles without proper authorization. This type of vulnerability maps directly to CWE-285, which categorizes improper authorization issues, and aligns with ATT&CK technique T1078 for valid accounts and T1484 for elevation of privileges. The flaw allows for unauthorized access to sensitive configuration data, management interfaces, and network control functions that should be restricted to authorized administrators only. The vulnerability essentially undermines the fundamental security model of the SD-WAN platform by enabling privilege escalation through improper access control enforcement.
The operational impact of CVE-2018-17448 extends beyond simple unauthorized access, as it can lead to complete compromise of the SD-WAN infrastructure. Organizations utilizing affected versions face risks including data exfiltration, network disruption, and potential lateral movement within their network environments. The vulnerability creates an entry point for attackers to manipulate network policies, redirect traffic, and potentially establish persistent access to critical network infrastructure. This threat is particularly concerning for organizations relying on SD-WAN solutions for secure network connectivity, as it could enable attackers to gain control over network routing decisions and traffic management functions. The impact is amplified when considering that SD-WAN solutions often serve as core network infrastructure components that facilitate communication between distributed locations.
Mitigation strategies for this vulnerability should prioritize immediate patching of affected systems to the latest available versions that contain the necessary access control fixes. Organizations must also implement network segmentation and monitoring to detect unauthorized access attempts and privilege escalation activities. Security teams should conduct thorough access control reviews and ensure that least privilege principles are enforced across all SD-WAN management interfaces. The remediation process should include verification that all administrative accounts have proper authentication requirements and that session management mechanisms are properly configured to prevent unauthorized access. Additionally, organizations should implement continuous monitoring for suspicious activities related to network management interfaces and establish incident response procedures specifically addressing access control breaches in SD-WAN environments.