Description
The netty incubator codec.bhttp is a java language binary http parser. Prior to version 0.0.21.Final, HKDF_expand returns non-NULL on failure. The byte[] is filled with zeros and has no way to distinguish success from failure. Since this output is used as HKDF key material for the response AEAD, a failure silently produces an all-zero key. When EVP_HPKE_CTX_export fails it also returns an empty byte[] array filled with zeros. This byte[] feeds directly into OHttpCrypto.createResponseAEAD(...). A silent all-zero export secret would produce a deterministic, attacker-predictable AEAD key. Version 0.0.21.Final patches the issue.
Problem types
CWE-330: Use of Insufficiently Random Values
Product status
References
github.com/...-ohttp/security/advisories/GHSA-f659-372h-6x3x
github.com/...ommit/3d3b4e527fc82ad0fe3db1af951ffd0ec9a10680