CVE-2006-0194 in FogBugz
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in default.asp in FogBugz 4.029, and other versions before 4.0.33, allows remote attackers to inject arbitrary web script or HTML via the dest parameter in the pgLogon page.
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Analysis
by VulDB Data Team • 10/01/2024
The vulnerability identified as CVE-2006-0194 represents a critical cross-site scripting flaw discovered in FogBugz version 4.029 and earlier releases, specifically affecting the default.asp component within the application's authentication framework. This issue manifests when users navigate to the pgLogon page and interact with the dest parameter, creating an avenue for malicious actors to execute unauthorized web scripts or HTML content within the context of authenticated user sessions. The flaw resides in the application's insufficient input validation mechanisms, particularly concerning parameters passed during the login process, which fails to properly sanitize or escape user-supplied data before processing.
From a technical perspective, this vulnerability operates through the exploitation of improper output encoding and input validation weaknesses that allow attackers to inject malicious payloads into the dest parameter. The dest parameter typically serves as a redirect URL mechanism that determines where users are sent after successful authentication, but in vulnerable versions of FogBugz, this parameter becomes a vector for XSS attacks. The flaw enables attackers to craft malicious URLs containing script tags or other HTML content that gets executed in the victim's browser when they are redirected to the application's login page. This represents a classic reflected XSS vulnerability where the malicious input is immediately reflected back to the user without proper sanitization.
The operational impact of this vulnerability extends beyond simple script execution, as it can potentially enable attackers to hijack user sessions, steal sensitive authentication tokens, or perform unauthorized actions within the application's context. Given that FogBugz is a case management and project tracking system commonly used in enterprise environments, successful exploitation could lead to unauthorized access to confidential project data, user information, and business-critical case management systems. The vulnerability affects not just individual users but could compromise entire organizational security postures when attackers leverage the XSS flaw to gain elevated privileges or access to sensitive information within the application's database.
Security professionals should recognize this vulnerability as aligning with CWE-79, which specifically addresses Cross-Site Scripting flaws in web applications, and it demonstrates the critical importance of input validation and output encoding practices. The ATT&CK framework categorizes this as a technique that enables initial access and privilege escalation through web-based attack vectors. Organizations should immediately implement mitigations including parameter validation, input sanitization, and output encoding for all user-supplied parameters, particularly those used in redirect mechanisms. The recommended solution involves updating to FogBugz version 4.0.33 or later, which contains the necessary patches to address the XSS vulnerability, while also implementing additional security controls such as Content Security Policy headers and regular security assessments to prevent similar issues in other application components.