CVE-2007-3817 in LoginToboggan module
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the LoginToboggan module 4.7.x-1.0, 4.7.x-1.x-dev, and 5.x-1.x-dev before 20070712 for Drupal, when configured to display a "Log out" link, allows remote attackers to inject arbitrary web script or HTML via a crafted username. NOTE: Drupal sanitizes the username by removing certain characters, so this might not be a vulnerability on default installations.
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Analysis
by VulDB Data Team • 10/26/2017
The CVE-2007-3817 vulnerability represents a cross-site scripting flaw within the LoginToboggan module for Drupal content management systems. This particular vulnerability affects specific version ranges including 4.7.x-1.0, 4.7.x-1.x-dev, and 5.x-1.x-dev prior to the 20070712 release. The vulnerability manifests when the module is configured to display a "Log out" link, creating an opportunity for malicious actors to inject arbitrary web scripts or HTML content through carefully crafted usernames. The technical nature of this flaw falls under CWE-79 which specifically addresses cross-site scripting vulnerabilities where untrusted data is improperly incorporated into web pages without proper sanitization or encoding measures.
The operational impact of this vulnerability extends beyond simple script injection, as it allows remote attackers to potentially execute malicious code within the context of a victim's browser session. When a user visits a page where the LoginToboggan module displays a logout link, the vulnerable code path processes the username without adequate input validation, creating a vector for attackers to embed malicious payloads. The vulnerability's exploitation potential is particularly concerning because it leverages the legitimate functionality of the module's logout link display feature, making it more difficult for users to distinguish between benign and malicious content. This type of attack aligns with ATT&CK technique T1531 which focuses on credential access through manipulation of authentication mechanisms.
The vulnerability's effectiveness is significantly mitigated by Drupal's default sanitization practices that remove certain characters from usernames, suggesting that the issue may not affect installations using default configurations. However, organizations that have customized their LoginToboggan module settings or modified the default sanitization rules may remain vulnerable. The security implications extend beyond simple XSS execution as attackers could potentially steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious websites. The vulnerability demonstrates the critical importance of proper input validation and output encoding in web applications, particularly when handling user-provided data that will be rendered in web contexts. Organizations should consider implementing additional security measures including content security policies, input validation at multiple layers, and regular security audits of third-party modules to prevent similar vulnerabilities from compromising their Drupal installations.