CVE-2008-4761 in eSupport
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in includes/htmlArea/plugins/HtmlTidy/html-tidy-logic.php in Kayako eSupport 3.20.2 allows remote attackers to inject arbitrary web script or HTML via the jsMakeSrc parameter. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information. NOTE: this issue is probably in the HTMLArea HTMLTidy (HTML Tidy) plugin, not eSupport.
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Analysis
by VulDB Data Team • 03/12/2025
The vulnerability described in CVE-2008-4761 represents a classic cross-site scripting flaw that exists within the Kayako eSupport 3.20.2 web application framework. This particular vulnerability is located within the HTMLArea plugins directory, specifically in the html-tidy-logic.php file which is part of the HtmlTidy plugin component. The issue manifests when the application fails to properly sanitize user input before processing it within the jsMakeSrc parameter, creating an avenue for malicious actors to execute arbitrary JavaScript code within the context of other users' browsers. The vulnerability is particularly concerning because it resides in a core HTML editing component that would be frequently used within the support ticketing system, making it accessible to various user roles within the application environment.
The technical exploitation of this vulnerability occurs through the manipulation of the jsMakeSrc parameter which is processed by the HtmlTidy plugin logic. When an attacker crafts a malicious payload containing JavaScript code and injects it through this parameter, the vulnerable application does not properly escape or filter the input before rendering it in the browser context. This failure to implement proper input validation and output encoding creates a persistent XSS vector that can be leveraged to execute malicious scripts, steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious websites. The vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws in web applications, where insufficient validation of user-provided data allows attackers to inject malicious code into web pages viewed by other users.
The operational impact of this vulnerability extends beyond simple script execution as it fundamentally compromises the security model of the eSupport platform. Attackers could potentially steal sensitive customer data, manipulate support tickets, access administrative functions, or establish persistent backdoors within the application environment. The fact that this vulnerability exists in a plugin component rather than the core application suggests that the attack surface might be more limited, but it also indicates that the security controls are insufficient at multiple levels of the application stack. This vulnerability particularly affects organizations that rely heavily on web-based support systems where users might have access to HTML editing capabilities, making it a significant risk for customer data exposure and system integrity compromise. The impact is amplified when considering that the application is designed to handle sensitive customer support information, making any XSS vulnerability a critical security concern.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application stack. The most effective immediate fix involves sanitizing all user-provided input, particularly parameters like jsMakeSrc, through proper escaping techniques before processing or rendering. Organizations should implement Content Security Policy headers to limit script execution and prevent unauthorized code injection. The recommended approach includes applying the principle of least privilege by restricting HTML editing capabilities to trusted administrators only and implementing proper parameter validation at the application level. Additionally, regular security audits and input validation testing should be conducted to identify similar vulnerabilities in third-party plugins and components. The remediation process should also involve updating to patched versions of the HtmlTidy plugin or replacing it with a more secure alternative, while maintaining proper security monitoring to detect any exploitation attempts. Organizations should also consider implementing web application firewalls and intrusion detection systems to provide additional layers of protection against such attacks, aligning with ATT&CK framework techniques that target web application vulnerabilities for initial access and persistence.