CVE-2015-4358 in Ubercart Discount Coupons Module
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in unspecified administration pages in the Ubercart Discount Coupons module 6.x-1.x before 6.x-1.8 for Drupal allows remote authenticated users with certain permissions to inject arbitrary web script or HTML via vectors related to taxonomy terms.
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Analysis
by VulDB Data Team • 04/07/2019
The CVE-2015-4358 vulnerability represents a critical cross-site scripting flaw within the Ubercart Discount Coupons module for Drupal 6.x-1.x versions prior to 6.x-1.8. This security weakness specifically targets administrative pages and affects authenticated users who possess certain permissions within the Drupal content management system. The vulnerability arises from insufficient input validation and output encoding mechanisms when processing taxonomy terms within the discount coupon administration interface, creating an exploitable condition that can be leveraged by malicious actors.
The technical implementation of this XSS vulnerability stems from the module's failure to properly sanitize user-supplied input when handling taxonomy term data in administrative contexts. When authenticated users with appropriate permissions create or modify discount coupons, the system does not adequately escape or validate special characters in taxonomy term names or descriptions. This allows attackers to inject malicious JavaScript code or HTML content that gets executed in the browsers of other administrators who view the affected pages. The vulnerability specifically manifests when taxonomy terms are displayed in the administrative interface, making it particularly dangerous for users with elevated privileges who regularly access coupon management features.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it can enable attackers to escalate privileges and gain deeper access to the Drupal installation. An attacker who successfully exploits this XSS flaw could potentially execute arbitrary code within the context of other administrators' sessions, leading to complete system compromise. This risk is particularly elevated in environments where administrative users frequently interact with the discount coupon management interface, as the attack surface remains active for extended periods. The vulnerability also undermines the integrity of the administrative interface, potentially allowing attackers to modify or delete discount coupons, affecting business operations and revenue streams.
Mitigation strategies for CVE-2015-4358 should prioritize immediate patching of the Ubercart Discount Coupons module to version 6.x-1.8 or later, which includes proper input validation and output encoding fixes. Organizations should implement additional defensive measures including regular security audits of contributed modules, enforcement of strict input validation policies, and implementation of Content Security Policy headers to limit script execution. The vulnerability aligns with CWE-79 which describes Cross-site Scripting flaws, and can be mapped to ATT&CK technique T1059.007 for Scripting, as it enables attackers to execute malicious scripts within the browser context of authenticated users. Network segmentation and privilege separation should be implemented to limit the potential impact if an attacker successfully exploits this vulnerability, while regular monitoring of administrative interfaces should be maintained to detect unauthorized modifications to coupon data.