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The vulnerability in Teleport allows remote attackers to bypass authentication mechanisms due to improper validation of session tokens during the handshake process. Attackers can craft malicious requests with manipulated tokens, exploiting a flaw in the JWT verification logic. This occurs when Teleport fails to validate token expiration and signature correctly under specific edge cases. The issue stems from a race condition in the caching layer, allowing expired or invalid tokens to be accepted temporarily.
DailyCVE Form:
Platform: Teleport
Version: 13.0.0 – 17.5.1
Vulnerability: Auth Bypass
Severity: Critical
Date: Jun 16, 2025
Prediction: Patch by Jun 30, 2025
What Undercode Say:
curl -X GET "https://teleport.example.com/api/sessions" -H "Authorization: Bearer MALICIOUS_TOKEN"
if err := validateToken(token); err != nil { // Flawed validation
return nil
}
How Exploit:
- Craft malformed JWT with invalid signature
- Spam auth requests during cache refresh
- Reuse expired session tokens
Protection from this CVE:
- Upgrade to 17.5.2/16.5.12/15.5.3
- Disable token caching
- Enforce strict JWT validation
Impact:
- Unauthorized access to clusters
- Privilege escalation
- Data exfiltration
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
