CyberRota Analysis
AI-GeneratedThe vulnerability in dashbit nimble_zta allows unauthenticated remote attackers to impersonate any Cloudflare service token by exploiting improper verification of cryptographic signatures. This can lead to unauthorized access to applications utilizing Cloudflare's Zero Trust authentication strategy. Organizations using nimble_zta versions from 0.1.2 to before 0.1.3 should prioritize immediate updates to mitigate this critical security risk.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Improper Verification of Cryptographic Signature vulnerability in dashbit nimble_zta allows an unauthenticated remote attacker to authenticate as an arbitrary Cloudflare service token. Applications using the Cloudflare Zero Trust authentication strategy are affected. verify_token/2 in lib/nimble_zta/cloudflare.ex matches the result of JOSE.JWT.verify/2 against {_, token, _s}, which discards the boolean verification result and returns the decoded token after a failed signature check. The attacker sends a forged JWT in the cf-access-jwt-assertion header, carrying the expected iss claim and the seven service token claims. verify_iss/2 reads the iss claim from the forged token, so it rejects nothing, and the service token path then returns those claims as the authenticated identity. This issue affects nimble_zta: from 0.1.2 before 0.1.3.