CVE-2007-4975 in b1gMail
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in hilfe.php in b1gMail 6.3.1 allows remote attackers to inject arbitrary web script or HTML via the chapter parameter.
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Analysis
by VulDB Data Team • 06/14/2025
The vulnerability identified as CVE-2007-4975 represents a classic cross-site scripting flaw within the b1gMail email client software version 6.3.1. This issue specifically affects the hilfe.php script which serves as a help or documentation interface within the application. The vulnerability arises from insufficient input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before rendering it within the web interface. Attackers can exploit this weakness by manipulating the chapter parameter through maliciously crafted URLs, thereby injecting arbitrary HTML code or JavaScript payloads that execute in the context of other users' browsers. The flaw demonstrates a clear violation of secure coding principles and represents a fundamental failure in the application's defense-in-depth strategy against client-side attacks.
The technical implementation of this vulnerability stems from the application's failure to properly escape or filter input values passed through the chapter parameter. When b1gMail processes the hilfe.php request, it directly incorporates user-provided data into dynamically generated HTML content without adequate sanitization measures. This creates an environment where attacker-controlled input can be interpreted as executable code rather than benign text. The vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically representing a reflected XSS attack vector where the malicious payload is reflected back to the user through the application's response. The attack requires no privileged access and can be executed through social engineering techniques, making it particularly dangerous in environments where users frequently click on links from untrusted sources. The flaw operates at the application layer of the OSI model, specifically affecting the presentation layer where user interface elements are generated and rendered.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it can enable sophisticated attack chains that compromise entire user sessions and potentially lead to privilege escalation. An attacker could craft malicious URLs that, when clicked by authenticated users, would execute scripts that steal session cookies, redirect users to phishing sites, or even modify application behavior. The vulnerability affects the confidentiality, integrity, and availability of the b1gMail application and the data it handles, as compromised user sessions could lead to unauthorized access to email accounts, personal information disclosure, and potential system compromise. This flaw undermines the trust relationship between users and the application, as legitimate users may unknowingly execute malicious code that appears to be part of the application's normal operation. The attack vector is particularly concerning because it requires minimal technical expertise to exploit and can affect any user who accesses the vulnerable help interface.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements. The primary fix involves implementing proper input validation and output encoding for all user-supplied parameters, specifically ensuring that the chapter parameter in hilfe.php is sanitized before being incorporated into HTML responses. This includes applying HTML entity encoding to prevent script execution and implementing strict input validation that rejects or removes potentially malicious content. Organizations should also consider implementing Content Security Policy headers to add an additional layer of protection against XSS attacks. The remediation aligns with ATT&CK technique T1566 which covers social engineering tactics, as this vulnerability could be exploited through phishing campaigns targeting the help interface. Security teams should conduct comprehensive code reviews to identify similar patterns in other application components and implement automated testing procedures to prevent regression. Additionally, regular security updates and patch management processes should be strengthened to ensure timely deployment of security fixes. The vulnerability serves as a reminder of the critical importance of input validation and output encoding in preventing client-side attacks, with implications for both application developers and security operations teams responsible for maintaining web application security postures.