CVE-2005-3128 in Address Add Plugin
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in add.php in Address Add Plugin 1.9 and 2.0 for Squirrelmail allows remote attackers to inject arbitrary web script or HTML via the IMG tag.
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Analysis
by VulDB Data Team • 12/02/2025
The vulnerability identified as CVE-2005-3128 represents a classic cross-site scripting flaw within the Address Add Plugin for Squirrelmail email client software. This issue affects versions 1.9 and 2.0 of the plugin, which is commonly used to manage email addresses and contact information within the Squirrelmail webmail interface. The vulnerability specifically resides in the add.php script that handles the addition of new address entries, creating a potential attack vector that could compromise user sessions and data integrity.
The technical exploitation of this vulnerability occurs through the improper sanitization of user input when processing the IMG tag within the address addition functionality. Attackers can craft malicious payloads that include script code within the IMG tag attributes, which are then executed in the context of other users' browsers when they view the compromised address entries. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws where input data is not properly validated or escaped before being rendered in web pages. The vulnerability demonstrates a failure in input validation and output encoding practices that are fundamental to preventing XSS attacks.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal sensitive information, or redirect users to malicious websites. When users with administrative privileges view address entries containing malicious code, the attacker gains elevated privileges to manipulate address book entries and potentially access other user data. The vulnerability creates a persistent threat vector that can be exploited across multiple users within the same Squirrelmail installation, making it particularly dangerous in shared email environments. According to ATT&CK framework, this vulnerability maps to T1059.007 for scripting and T1566 for phishing, as it enables the delivery of malicious content through legitimate email interfaces.
Mitigation strategies for CVE-2005-3128 should focus on immediate patching of the Address Add Plugin to versions that properly sanitize user input and implement proper HTML escaping for all dynamic content. Organizations should also implement input validation mechanisms that restrict the use of potentially dangerous HTML tags and attributes within address book entries. Network administrators should consider implementing web application firewalls that can detect and block suspicious script injection attempts, while security teams should conduct regular vulnerability assessments to identify similar input validation weaknesses in other web applications. Additionally, user education regarding the dangers of clicking on suspicious links or viewing untrusted email content remains crucial in preventing exploitation of this vulnerability. The remediation process should include thorough testing to ensure that the patch does not introduce regressions in legitimate functionality while maintaining the security improvements necessary to protect against XSS attacks.