CVE-2015-7349 in DIGIPASS Authentication Plug-In
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the sample feedback.inc file in VASCO DIGIPASS authentication plug-in for Citrix Web Interface allows remote attackers to inject arbitrary web script or HTML via the failmessage parameter.
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Analysis
by VulDB Data Team • 11/20/2019
The CVE-2015-7349 vulnerability represents a critical cross-site scripting flaw within the VASCO DIGIPASS authentication plugin for Citrix Web Interface, specifically targeting the sample feedback.inc file. This vulnerability exposes organizations to significant security risks by allowing remote attackers to execute malicious scripts through crafted input parameters. The flaw manifests when the failmessage parameter is processed without proper sanitization, creating an avenue for attackers to inject arbitrary web scripts or HTML content that can be executed in the context of authenticated users' browsers.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding within the authentication plugin's feedback handling mechanism. When the failmessage parameter is passed through the sample feedback.inc file, the system fails to properly sanitize or escape user-supplied data before rendering it in the web interface. This primitive yet dangerous flaw aligns with CWE-79, which classifies cross-site scripting vulnerabilities as weaknesses in input validation and output encoding. The vulnerability operates at the application layer and can be exploited through HTTP requests that manipulate the failmessage parameter, making it particularly dangerous in environments where users interact with the Citrix Web Interface for authentication purposes.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to hijack user sessions, steal sensitive authentication credentials, or redirect users to malicious sites. In the context of Citrix Web Interface environments, where users typically access corporate resources through secure authentication channels, this vulnerability undermines the integrity of the entire authentication process. Attackers can leverage this flaw to create persistent malicious scripts that execute in the victim's browser context, potentially leading to privilege escalation or data exfiltration. The vulnerability's remote exploitability means that attackers do not require physical access to the system or local network privileges to carry out successful attacks, making it particularly concerning for organizations with distributed user bases.
Organizations should implement multiple layers of defense to mitigate this vulnerability, starting with immediate patching of the affected VASCO DIGIPASS plugin components. The remediation strategy should include input validation mechanisms that properly sanitize all user-supplied parameters, particularly those used in feedback or error message handling. Security teams should also consider implementing content security policies that restrict script execution within the web interface and deploy web application firewalls to monitor and filter suspicious requests. From an ATT&CK framework perspective, this vulnerability maps to techniques involving command and control communications and credential access, as attackers can use the XSS to establish persistent access or harvest session tokens. Regular security assessments of third-party plugins and authentication mechanisms should be conducted to identify similar vulnerabilities that could compromise the broader security posture of the organization's authentication infrastructure.