Traefik is an open-source reverse proxy and load balancer that is popularly used in cloud-native applications and microservices. It is designed to provide developers with an easy and configurable way to manage and route traffic across their applications. With its features such as dynamic service discovery, SSL/TLS encryption, and Kubernetes integration, Traefik simplifies the task of operating distributed applications in a containerized environment.
However, like any other software, vulnerabilities may sometimes be detected in Traefik. One such vulnerability is known as CVE-2020-15129. This vulnerability affects versions before 1.7.26, 2.2.8, and 2.3.0-rc3. It is an open redirect vulnerability in Traefik's handling of the "X-Forwarded-Prefix" header. The issue arises when the Traefik API dashboard component fails to validate that the value of the header "X-Forwarded-Prefix" is a site relative path and will therefore redirect to any header provided URI.
If exploited, the vulnerability can be used to entice victims to disclose sensitive information. For instance, an attacker can craft a malicious link with the opening redirect embedded within it and send this link to a victim. Once the victim clicks on the link, they will be redirected to a phishing site or a fake login page where they may unknowingly enter their login credentials which will then be stolen by the attacker.
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REFERENCES
- https://github.com/containous/traefik/security/advisories/GHSA-6qq8-5wq3-86rp
- https://github.com/containous/traefik/releases/tag/v1.7.26
- https://github.com/containous/traefik/releases/tag/v2.2.8
- https://github.com/containous/traefik/releases/tag/v2.3.0-rc3
- https://github.com/containous/traefik/pull/7109
- https://github.com/containous/traefik/commit/e63db782c11c7b8bfce30be4c902e7ef8f9f33d2
To protect against this vulnerability, Traefik users are advised to upgrade to the latest patched version and implement the following precautions:
- Ensure all running Traefik instances are updated to the latest patched versions.
- Block all untrusted request headers. In this case, block the "X-Forwarded-Prefix" header from untrusted sources.
- Implement a web application firewall (WAF) to monitor traffic and detect malicious requests.
- Train employees on phishing and social engineering attacks, showing them real-life examples so that they can identify and report fraudulent attempts.
- Regularly perform security assessments on applications and networks to identify vulnerabilities and proactively address them before they can be exploited.
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