CVE-2014-4346 in Netscaler Gateway
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in administration user interface in Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway (formerly Access Gateway Enterprise Edition) 10.1 before 10.1-126.12 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 02/09/2022
The CVE-2014-4346 vulnerability represents a critical cross-site scripting flaw discovered in Citrix NetScaler Application Delivery Controller and NetScaler Gateway products. This vulnerability exists within the administrative user interface components of these network security appliances, specifically affecting version 10.1 before 10.1-126.12. The flaw allows remote attackers to execute malicious web scripts or HTML code within the context of authenticated administrative sessions, potentially compromising the entire network infrastructure managed by these devices.
The technical nature of this vulnerability stems from insufficient input validation and output encoding mechanisms within the administrative web interface of Citrix NetScaler appliances. Attackers can exploit this weakness through unspecified vectors that likely involve manipulating parameters or input fields within the management interface. The vulnerability is classified under CWE-79, which specifically addresses Cross-site Scripting flaws, making it a well-documented and serious security concern in web application security. This particular implementation allows attackers to inject malicious scripts that can execute in the browser of authenticated administrators, creating a significant attack surface for privilege escalation and data exfiltration.
The operational impact of this vulnerability extends far beyond simple script injection, as it provides attackers with a potential pathway to gain administrative control over critical network infrastructure. When an attacker successfully exploits this vulnerability, they can manipulate the administrative interface to perform unauthorized actions such as modifying configuration settings, creating new user accounts, or redirecting traffic to malicious destinations. The attack vector being remote means that exploitation can occur from any location without requiring physical access to the network equipment. This vulnerability directly aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter and T1078 for Valid Accounts, as it enables attackers to leverage legitimate administrative access for malicious purposes.
Organizations utilizing Citrix NetScaler ADC and Gateway appliances in their network infrastructure face severe risks when this vulnerability remains unpatched. The administrative interface is typically accessible from within the network perimeter or through secure remote access channels, making it a prime target for attackers seeking to establish persistent access to network resources. The vulnerability's potential for privilege escalation is particularly concerning as it can enable attackers to bypass traditional network security controls and gain visibility into sensitive network configurations and traffic patterns. Security teams should consider this vulnerability as part of a broader attack chain that could lead to complete network compromise, especially in environments where these appliances serve as critical network gateways or load balancers.
Mitigation strategies for CVE-2014-4346 should prioritize immediate patch deployment from Citrix, as this vulnerability has been addressed in subsequent releases of the NetScaler software. Organizations should implement network segmentation to limit access to administrative interfaces, ensuring that only authorized personnel can reach these critical management points. Additional defensive measures include implementing web application firewalls, monitoring for suspicious administrative activities, and establishing strict access controls through multi-factor authentication. Regular security assessments of network infrastructure should include verification of patch levels and configuration hardening to prevent exploitation of similar vulnerabilities in the future. The vulnerability demonstrates the importance of maintaining up-to-date security patches and proper input validation mechanisms in enterprise network appliances.