Red Hat Undertow Multiple Vulnerabilities Allow Security Bypass

Red Hat Undertow is vulnerable to multiple security flaws that could allow an unauthenticated, remote attacker to bypass security restrictions, manipulate data, and expose sensitive information. The specifics of these vulnerabilities are not detailed, but the advisory indicates a high severity due to the potential impact. Without further information, defenders should assume all versions of Undertow are affected. This lack of specific CVEs or exploitation details makes precise mitigation challenging. Defenders should focus on broad detection strategies for anomalous activity related to Undertow deployments.

Attack Chain

1. The attacker identifies a vulnerable Red Hat Undertow instance exposed to the internet.
2. The attacker sends a specially crafted HTTP request designed to exploit one of the undisclosed vulnerabilities.
3. The vulnerable Undertow instance processes the malicious request, leading to a security bypass.
4. The attacker exploits the bypassed security measure to manipulate data within the application.
5. The attacker leverages another vulnerability to gain unauthorized access to sensitive information stored within the application or backend systems.
6. The attacker exfiltrates the compromised data or uses it to further compromise the system.
7. The attacker maintains persistence by creating backdoors.

Impact

Successful exploitation of these vulnerabilities could lead to significant data breaches, unauthorized modification of critical application data, and complete compromise of the affected system. The lack of specific vulnerability details makes it difficult to quantify the exact number of potential victims or targeted sectors. The impact ranges from data theft and service disruption to complete system takeover, depending on the specific vulnerabilities exploited and the application’s role.

Recommendation

• Monitor web server logs (category: webserver, product: linux) for suspicious HTTP requests, particularly those with unusual URI patterns or excessive length, using the provided Sigma rule.
• Implement rate limiting and input validation on all Undertow deployments to mitigate potential exploitation attempts.
• Review access control configurations for all applications using Undertow to ensure least privilege principles are enforced.