CVE-2015-7373 in Adserver
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the "magic-macros" feature in Revive Adserver before 3.2.2 allows remote attackers to inject arbitrary web script or HTML via a GET parameter, which is not properly handled in a banner.
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Analysis
by VulDB Data Team • 06/21/2022
The CVE-2015-7373 vulnerability represents a critical cross-site scripting flaw within the magic-macros functionality of Revive Adserver versions prior to 3.2.2. This vulnerability resides in the banner handling mechanism where GET parameters containing malicious scripts are not properly sanitized or escaped before being rendered in web pages. The issue stems from insufficient input validation and output encoding practices that allow attackers to inject arbitrary HTML and JavaScript code through carefully crafted URL parameters. The vulnerability specifically affects the banner rendering process where user-supplied data is directly incorporated into the web response without adequate security measures to prevent malicious code execution.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious GET parameter containing script code and injects it into the banner display functionality. The magic-macros feature, designed to enable dynamic ad content generation, fails to properly validate or escape the input parameters before incorporating them into the HTML output. This creates an environment where malicious scripts can execute in the context of other users' browsers who view the compromised banner content. The vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws, where improper neutralization of input during web page generation allows attackers to inject client-side scripts.
The operational impact of this vulnerability extends beyond simple script injection as it can enable attackers to perform session hijacking, steal user credentials, redirect users to malicious sites, or even execute arbitrary commands on affected systems. When users interact with compromised banner content, their browsers execute the injected scripts, potentially leading to complete compromise of user sessions and unauthorized access to sensitive data. The vulnerability affects the core advertising functionality of Revive Adserver, making it particularly dangerous as it can be exploited through legitimate advertising channels, potentially affecting thousands of users simultaneously.
Organizations using affected versions of Revive Adserver should immediately implement the available security patches and updates to remediate this vulnerability. The fix typically involves implementing proper input validation and output encoding mechanisms for all GET parameters used in banner rendering. Security measures should include sanitizing all user-supplied input, implementing Content Security Policies to prevent unauthorized script execution, and ensuring that all dynamic content generation follows secure coding practices. Additionally, organizations should conduct comprehensive security assessments of their ad server configurations and implement monitoring for suspicious parameter usage patterns. This vulnerability demonstrates the critical importance of input validation in web applications and aligns with ATT&CK technique T1566 which covers the exploitation of web application vulnerabilities for initial access and privilege escalation.