Description (CNA)
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, the OAuth2 HTTP filter's encrypt()/decrypt() functions use AES-256-CBC without an authentication tag (no HMAC, no AEAD). The /callback endpoint returns HTTP 302 on successful decryption and HTTP 401 on padding failure, creating a padding oracle. An attacker who obtains the encrypted CodeVerifier cookie can recover the plaintext PKCE code_verifier in ~6,200 requests (~100 seconds), then exchange it with a stolen authorization code to obtain the victim's access token. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| envoyproxy / envoy | affected >= 1.38.0, < 1.38.1; affected >= 1.37.0, < 1.37.3; affected >= 1.36.0, < 1.36.7; affected < 1.35.11 |
CWE
CWE-209, CWE-327
References
ADP enrichment
No English description supplied.