CVE-2019-12988 in SD-WAN
Summary
by MITRE
Citrix SD-WAN 10.2.x before 10.2.3 and NetScaler SD-WAN 10.0.x before 10.0.8 have Improper Input Validation (issue 4 of 6).
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Analysis
by VulDB Data Team • 11/01/2023
Citrix SD-WAN and NetScaler SD-WAN solutions are widely deployed network infrastructure platforms that provide software-defined wide area network capabilities for enterprise organizations. These systems manage critical network traffic routing and optimization functions across distributed enterprise environments. The vulnerability identified as CVE-2019-12988 represents a critical weakness in input validation mechanisms within the affected software versions, specifically addressing improper validation of user-supplied data. This flaw exists within the broader context of the software's data handling processes and could potentially allow unauthorized access or manipulation of network operations. The vulnerability affects Citrix SD-WAN versions 10.2.x prior to 10.2.3 and NetScaler SD-WAN versions 10.0.x prior to 10.0.8, indicating a significant attack surface across multiple release lines of these networking platforms.
The technical implementation of this vulnerability stems from inadequate validation of input parameters that are processed by the affected systems. When user-supplied data is not properly validated before being processed or stored within the system, it creates opportunities for malicious actors to inject malformed or unexpected input that could alter system behavior. This improper input validation issue typically manifests when the system fails to adequately sanitize or check data types, lengths, or formats of incoming requests. The vulnerability is categorized under CWE-20, which specifically addresses Improper Input Validation, a fundamental security weakness that has been consistently identified as a primary attack vector in network security breaches. The flaw allows attackers to potentially manipulate system operations through crafted input that bypasses normal validation checks, potentially leading to unauthorized access or data manipulation.
The operational impact of this vulnerability extends beyond simple data validation concerns and represents a significant threat to network infrastructure integrity. Attackers could exploit this weakness to perform unauthorized operations within the SD-WAN environment, potentially gaining access to sensitive network configuration data or manipulating routing decisions. The implications are particularly severe given that SD-WAN systems control critical network traffic flows and often contain privileged access information. This vulnerability could enable adversaries to escalate privileges, access confidential network information, or disrupt network operations through injection attacks. Organizations relying on these platforms face potential exposure to man-in-the-middle attacks, data exfiltration attempts, or network disruption scenarios that could significantly impact business continuity and network performance.
Mitigation strategies for this vulnerability require immediate patch management and system updates to the affected Citrix and NetScaler SD-WAN versions. Organizations should prioritize updating to the patched versions 10.2.3 for SD-WAN 10.2.x and 10.0.8 for NetScaler SD-WAN 10.0.x to address the improper input validation weakness. Network administrators should implement additional monitoring and logging mechanisms to detect potential exploitation attempts targeting this vulnerability. Security teams should conduct thorough vulnerability assessments of their SD-WAN deployments to identify any other potential input validation weaknesses that may exist within the broader network infrastructure. The ATT&CK framework categorizes this type of vulnerability under T1210 - Exploitation of Remote Services and T1078 - Valid Accounts, as attackers may leverage this weakness to establish persistent access or escalate privileges within the network environment. Organizations should also consider implementing network segmentation and access controls to limit potential impact if exploitation occurs, while maintaining comprehensive audit trails for incident response activities.