CVE-2013-0325 in Varnish
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in the Varnish module 6.x-1.x before 6.x-1.2 and 7.x-1.x before 7.x-1.0-beta2 for Drupal allow remote attackers to inject arbitrary web script or HTML via crafted a (1) Watchdog message or (2) admin setting.
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Analysis
by VulDB Data Team • 03/18/2019
The vulnerability identified as CVE-2013-0325 represents a critical cross-site scripting flaw within the Varnish module for Drupal platforms. This module serves as a caching solution that integrates with Drupal's content management system, providing performance optimization through reverse proxy functionality. The affected versions include 6.x-1.x prior to 6.x-1.2 and 7.x-1.x prior to 7.x-1.0-beta2, indicating a widespread impact across multiple Drupal major versions. The vulnerability stems from insufficient input validation and output encoding within the module's handling of administrative messages and configuration settings.
The technical flaw manifests when the Varnish module processes Watchdog messages or admin settings without proper sanitization of user-supplied input. Attackers can craft malicious payloads containing script tags or HTML content that gets executed within the context of authenticated administrator sessions. This occurs because the module fails to implement proper HTML escaping or validation mechanisms when displaying these elements in administrative interfaces. The vulnerability specifically affects the module's ability to distinguish between legitimate administrative content and potentially malicious input, creating an attack surface where unauthenticated users can inject code that executes when administrators view system logs or configuration pages.
The operational impact of this vulnerability is severe and multifaceted. An attacker who can submit malicious input through Watchdog messages or admin settings gains the ability to execute arbitrary scripts within the context of administrator sessions. This privilege escalation allows for complete compromise of the Drupal installation, enabling attackers to modify content, add new users, access sensitive data, or even execute commands on the underlying system. The vulnerability is particularly dangerous because it requires minimal privileges to exploit, as it only necessitates the ability to submit data that will be displayed in administrative interfaces. This creates a scenario where attackers can compromise administrative accounts through indirect means, potentially leading to full system takeover.
From a cybersecurity perspective, this vulnerability aligns with CWE-79, which describes cross-site scripting flaws in web applications, and maps to ATT&CK technique T1059.007 for scripting and T1548.001 for abuse of privileges. The vulnerability demonstrates poor input validation practices and inadequate output encoding, which are fundamental security principles that should be implemented in all web applications. Organizations running affected Drupal installations face significant risk, as the attack vector is relatively simple to exploit and the consequences are severe. The vulnerability affects the integrity and confidentiality of the entire system, as attackers can manipulate the administrative interface to gain persistent access or exfiltrate sensitive information.
Mitigation strategies for CVE-2013-0325 involve immediate patching of the Varnish module to versions 6.x-1.2 or 7.x-1.0-beta2, which contain the necessary security fixes. Additionally, organizations should implement proper input validation and output encoding mechanisms throughout their Drupal installations. Network segmentation and access controls can help limit the impact if an attacker successfully exploits the vulnerability. Regular security audits and monitoring of administrative interfaces should be conducted to detect any suspicious activity. The vulnerability underscores the importance of keeping all Drupal modules updated and implementing comprehensive security practices that include proper sanitization of user inputs and robust validation of all administrative operations.