CVE-2015-1459 in FortiAuthenticator
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Fortinet FortiAuthenticator 3.0.0 allows remote attackers to inject arbitrary web script or HTML via the operation parameter to cert/scep/.
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Analysis
by VulDB Data Team • 04/12/2022
The CVE-2015-1459 vulnerability represents a critical cross-site scripting flaw discovered in Fortinet FortiAuthenticator version 3.0.0, specifically affecting the cert/scep/ endpoint. This vulnerability falls under the CWE-79 category, which classifies cross-site scripting as a weakness where untrusted data is improperly integrated into web pages without proper validation or sanitization. The flaw enables remote attackers to execute malicious scripts in the context of authenticated users' browsers, potentially compromising the security of the authentication infrastructure. The vulnerability is particularly concerning because it affects a component that handles certificate management operations, which are fundamental to secure authentication processes within enterprise networks. The operation parameter serves as the injection vector, allowing attackers to craft malicious payloads that can be executed when the vulnerable application processes the input.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the FortiAuthenticator's certificate management subsystem. When the application receives the operation parameter through the cert/scep/ endpoint, it fails to properly sanitize or escape user-supplied data before incorporating it into web responses. This lack of proper data validation creates an environment where malicious actors can inject arbitrary HTML or JavaScript code that executes in the victim's browser context. The attack scenario typically involves an attacker crafting a malicious URL containing the XSS payload and delivering it to a victim who is authenticated to the FortiAuthenticator system. The vulnerability's impact is amplified by the fact that FortiAuthenticator serves as an authentication gateway, meaning successful exploitation could potentially lead to unauthorized access to protected resources or compromise of user credentials.
The operational impact of CVE-2015-1459 extends beyond simple script execution, as it represents a significant threat to the integrity and confidentiality of authentication processes. Attackers could leverage this vulnerability to steal session cookies, perform unauthorized actions on behalf of authenticated users, or redirect victims to malicious sites that could further compromise their systems. The vulnerability's remote exploitation capability means that attackers do not require physical access or network proximity to the FortiAuthenticator appliance. This makes the attack surface particularly broad, as any user with access to the affected system could potentially become a victim. The compromise of an authentication system through XSS can have cascading effects throughout an organization's security infrastructure, potentially enabling further attacks such as privilege escalation or lateral movement within the network. The vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, specifically focusing on JavaScript execution within the victim's browser environment.
Mitigation strategies for CVE-2015-1459 should focus on immediate patching of the FortiAuthenticator appliance to the latest firmware version that addresses this vulnerability. Organizations should also implement input validation and output encoding measures at the application level to prevent similar issues in other components. Network segmentation and access controls should be reviewed to limit exposure to the vulnerable endpoint. The implementation of Content Security Policy headers can provide additional protection against XSS attacks by restricting the sources from which scripts can be loaded. Security monitoring should include detection of suspicious parameter values in certificate management requests, and regular security assessments should be conducted to identify other potential injection points within the authentication infrastructure. Organizations should also consider implementing web application firewalls to provide an additional layer of protection against such attacks, particularly in environments where patching timelines may be extended. The vulnerability underscores the importance of maintaining up-to-date security measures and the critical need for proper input validation in all web applications handling sensitive authentication data.