CVE-2019-19336 in ovirt-engine
Summary
by MITRE
A cross-site scripting vulnerability was reported in the oVirt-engine's OAuth authorization endpoint before version 4.3.8. URL parameters were included in the HTML response without escaping. This flaw would allow an attacker to craft malicious HTML pages that can run scripts in the context of the user's oVirt session.
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Analysis
by VulDB Data Team • 05/11/2025
The cross-site scripting vulnerability identified as CVE-2019-19336 affects the oVirt-engine's OAuth authorization endpoint, representing a critical security flaw that undermines the integrity of user sessions within the virtualization platform. This vulnerability exists in versions prior to 4.3.8 and demonstrates a classic failure in input validation and output encoding practices that has significant implications for enterprise virtualization environments relying on oVirt for their infrastructure management.
The technical flaw stems from improper handling of URL parameters within the OAuth authorization response mechanism. When users are redirected to the authorization endpoint with specific parameters, the system fails to properly escape these parameters before including them in the HTML response sent back to the user's browser. This omission creates a condition where maliciously crafted URL parameters can be interpreted as executable JavaScript code rather than benign data, allowing attackers to inject arbitrary scripts into the victim's browser context. The vulnerability directly maps to CWE-79 - Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly escape output in web applications.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to hijack user sessions and potentially gain unauthorized access to critical virtualization resources. An attacker could craft malicious URLs that, when clicked by an authenticated user, would execute scripts that steal session cookies, redirect users to fraudulent pages, or perform actions on behalf of the victim within the oVirt environment. This type of attack aligns with ATT&CK technique T1539 - Steal or Forge Authentication Tokens, where adversaries exploit web application vulnerabilities to obtain credentials or session information. The attack surface is particularly concerning for enterprise environments where oVirt-engine serves as a central management platform for virtual machines, storage, and network resources.
Mitigation strategies for CVE-2019-19336 should prioritize immediate patching of affected oVirt-engine installations to version 4.3.8 or later, which includes proper parameter escaping mechanisms in the OAuth endpoint. Organizations should also implement additional defensive measures such as input validation at multiple layers, output encoding for all dynamic content, and regular security scanning of web applications. Network-level protections including web application firewalls and content security policies can provide additional defense-in-depth. The vulnerability highlights the critical importance of secure coding practices and proper input/output handling in authentication systems, particularly for enterprise platforms managing sensitive virtualized infrastructure. Security teams should conduct comprehensive assessments of their oVirt environments to ensure all instances have been updated and verify that proper security controls are in place to prevent similar vulnerabilities from emerging in other components of their virtualization stack.