CVE-2005-0404 in Kmail
Summary
by MITRE
KMail 1.7.1 in KDE 3.3.2 allows remote attackers to spoof email information, such as whether the email has been digitally signed or encrypted, via HTML formatted email.
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Analysis
by VulDB Data Team • 01/06/2025
The vulnerability described in CVE-2005-0404 represents a significant security flaw in KMail 1.7.1 that is part of the KDE 3.3.2 suite. This issue specifically affects email clients that process HTML formatted messages and creates a deceptive environment where attackers can manipulate the visual representation of email security indicators. The flaw resides in how the email client renders HTML content, particularly in the display of digital signature and encryption status indicators, allowing malicious actors to create false impressions of email authenticity and security.
This vulnerability falls under the category of information disclosure and deception, with potential implications for security awareness and trust in digital communications. The technical mechanism involves the manipulation of HTML email formatting to override or misrepresent the actual security status of messages. When KMail processes HTML emails, it fails to properly validate or sanitize the presentation layer elements that indicate security attributes, creating an opportunity for attackers to inject misleading HTML code that displays false security indicators to end users.
The operational impact of this vulnerability extends beyond simple deception to potentially enable more sophisticated social engineering attacks. Users who rely on visual indicators to determine whether emails have been digitally signed or encrypted may be misled into trusting messages that appear secure but are actually compromised. This creates a dangerous false sense of security that could facilitate phishing attacks, man-in-the-middle operations, or other malicious activities where the attacker exploits the user's trust in the visual security indicators. The vulnerability is particularly concerning because it operates at the presentation layer rather than the protocol level, making it difficult to detect through traditional network monitoring or security scanning tools.
From a cybersecurity perspective, this vulnerability aligns with CWE-601 and CWE-200 categories, representing URL redirection issues and information exposure respectively. The flaw demonstrates how client-side rendering can be exploited to bypass security mechanisms that users depend upon for protection. Organizations relying on KDE email clients for secure communications would be particularly vulnerable to this attack vector, as it undermines the fundamental security model that users expect from email applications. The attack requires no special privileges or complex exploitation techniques, making it accessible to a wide range of threat actors.
The mitigation strategies for this vulnerability should focus on both immediate client-side patches and broader security awareness measures. Software vendors should implement proper HTML sanitization and validation for security indicator display, ensuring that visual representations cannot be manipulated through HTML injection techniques. Users should be educated about the limitations of visual security indicators and encouraged to verify email authenticity through multiple means beyond visual cues. Network administrators should consider implementing additional email security layers such as DKIM and DMARC validation to provide more robust protection against such deception attacks. This vulnerability highlights the critical importance of proper input validation and the need for comprehensive security testing that considers both functional and presentation layer security implications.