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How the CVE Works
Traefik, a cloud-native edge router, mishandles path normalization when using PathPrefix, Path, or `PathRegex` matchers. An attacker can exploit this by injecting `/../` sequences in URLs, bypassing middleware security checks. For example, a request to http://target/service/sub-path/../admin` may skip middleware (my-middleware-a) intended for `/service` routes, allowing unauthorized access to backend services. This occurs due to improper path sanitization before routing decisions.
<h2 style="color: blue;">DailyCVE Form</h2>
Platform: Traefik
Version: <2.10.0
Vulnerability: Path Traversal Bypass
Severity: Critical
Date: 2023-XX-XX
<h2 style="color: blue;">What Undercode Say:</h2>
<h2 style="color: blue;">Exploit:</h2>
curl http://victim.com/service/sub-path/../admin
<h2 style="color: blue;">Mitigation:</h2>
<h2 style="color: blue;">Update Traefik to v2.10+. Apply regex-based path filtering:</h2>
match: PathPrefix(</code>/service<code>) && !PathRegexp(</code>(/../|/./)`)
Detection:
grep -r "PathPrefix" /etc/traefik/conf/
Analytics:
- Attack Vector: HTTP Request Manipulation
- CVSS Score: 9.1 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N)
- Affected Configs: IngressRoute with multiple path matchers.
Protection:
1. Enforce strict path normalization:
// Golang sanitization snippet strings.Replace(path, "/../", "", -1)
2. Audit middleware chains:
kubectl get ingressroute -o yaml | grep "middleware"
References:
Note:
- Test workarounds in staging before production.
- Monitor for anomalous path patterns in access logs.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
