CVE-2007-6477 in Web Interface
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the on-line help feature in Citrix Web Interface 2.0 and earlier, and NFuse, allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 04/23/2018
The vulnerability identified as CVE-2007-6477 represents a critical cross-site scripting flaw within Citrix Web Interface 2.0 and earlier versions, as well as in NFuse applications. This security weakness specifically targets the online help feature functionality, creating an avenue for malicious actors to execute arbitrary web scripts or HTML code within the context of affected systems. The vulnerability stems from insufficient input validation and output encoding mechanisms within the help system's processing pipeline, allowing attackers to inject malicious content that gets executed when legitimate users access the help feature.
The technical implementation of this XSS vulnerability operates through unspecified attack vectors that likely involve manipulation of user-supplied parameters within the help feature's interface. Attackers can craft malicious payloads that exploit the lack of proper sanitization controls, enabling them to inject script code that executes in the browser context of authenticated users. This flaw falls under CWE-79 which specifically addresses Cross-Site Scripting vulnerabilities, where improper validation of user input allows malicious scripts to be executed in the victim's browser. The vulnerability's impact extends beyond simple script execution as it can be leveraged for session hijacking, credential theft, and further exploitation within the compromised environment.
The operational consequences of this vulnerability are severe for organizations relying on Citrix Web Interface and NFuse solutions, as it creates persistent security risks for all users interacting with the help system. An attacker who successfully exploits this vulnerability can potentially steal session cookies, redirect users to malicious sites, or execute arbitrary commands within the context of the user's browser session. The remote nature of the attack means that exploitation does not require physical access to the target system, making it particularly dangerous for web-based applications. This vulnerability directly aligns with ATT&CK technique T1566 which covers spearphishing with a malicious attachment, as attackers could use the XSS vulnerability to deliver malicious payloads through compromised help content.
Organizations utilizing affected Citrix products should immediately implement comprehensive mitigation strategies to address this vulnerability. The primary remediation approach involves upgrading to patched versions of Citrix Web Interface and NFuse that contain proper input validation and output encoding controls. Additionally, implementing proper content security policies, input sanitization mechanisms, and regular security assessments can help prevent similar vulnerabilities from emerging in other components of the application stack. Security teams should also consider deploying web application firewalls and monitoring for suspicious patterns in help system usage that might indicate exploitation attempts. The vulnerability demonstrates the critical importance of validating all user inputs and properly encoding output in web applications to prevent XSS attacks that can compromise entire user sessions and potentially lead to broader system compromise.