CVE-2018-8600 in Azure App Service
Summary
by MITRE
A Cross-site Scripting (XSS) vulnerability exists when Azure App Services on Azure Stack does not properly sanitize user provided input, aka "Azure App Service Cross-site Scripting Vulnerability." This affects Azure App.
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Analysis
by VulDB Data Team • 04/12/2020
The vulnerability identified as CVE-2018-8600 represents a critical cross-site scripting flaw within Azure App Services operating on Azure Stack environments. This security weakness stems from insufficient input validation and sanitization mechanisms that fail to properly process user-provided data before it is rendered in web responses. The vulnerability specifically impacts the Azure App Service component, which serves as a foundational platform for hosting web applications within the Azure Stack infrastructure, making it a significant concern for organizations relying on this hybrid cloud solution. The flaw enables attackers to inject malicious scripts into web pages viewed by other users, potentially compromising the security of the entire application ecosystem.
The technical implementation of this vulnerability occurs when the Azure App Service fails to adequately sanitize or escape user input parameters before incorporating them into dynamically generated web content. This inadequate sanitization process creates an opening for attackers to inject malicious JavaScript code through various input vectors including form fields, URL parameters, or API endpoints. When legitimate users access pages containing this maliciously injected content, their browsers execute the embedded scripts, potentially leading to unauthorized actions such as session hijacking, data theft, or redirection to malicious websites. The vulnerability manifests across multiple service components within Azure App Services, particularly affecting the web application hosting capabilities that process user requests and generate dynamic responses.
The operational impact of CVE-2018-8600 extends beyond simple script execution, as it can facilitate more sophisticated attack vectors including session manipulation, privilege escalation, and data exfiltration. Attackers leveraging this vulnerability can potentially impersonate legitimate users, access sensitive application data, or manipulate application behavior in ways that compromise the integrity of the entire Azure Stack environment. Organizations utilizing Azure App Services for mission-critical applications face significant risk of unauthorized access, data breaches, and service disruption. The vulnerability's presence in hybrid cloud environments adds complexity to security management, as it affects both on-premises Azure Stack deployments and cloud-based Azure services, requiring coordinated remediation efforts across multiple infrastructure components.
Mitigation strategies for CVE-2018-8600 should prioritize immediate implementation of input validation and output encoding mechanisms within Azure App Services. Organizations must ensure that all user-provided data undergoes rigorous sanitization before processing, implementing proper HTML encoding and JavaScript escaping techniques to prevent script injection. The remediation approach should align with established security frameworks such as the CWE-79 pattern for cross-site scripting prevention, which emphasizes input validation and output encoding as primary defense mechanisms. Additionally, implementing proper content security policies and regular security assessments of Azure Stack environments will help prevent similar vulnerabilities from emerging in the future. Security teams should also consider deploying web application firewalls and monitoring solutions to detect and prevent exploitation attempts while maintaining compliance with industry standards like NIST SP 800-53 and ISO 27001 security requirements.