It is, therefore, affected by a vulnerability as referenced in the ALAS2-2024-2591 advisory. Issue summary: Calling the OpenSSL API function SSL_select_next_proto with anempty supported client protocols buffer may cause a crash or memory contents tobe sent to the peer. Impact summary: A buffer overread can have a range of potential consequencessuch as unexpected application beahviour or a crash. In particular this issuecould result in up to 255 bytes of arbitrary private data from memory being sentto the peer leading to a loss of confidentiality. However, only applicationsthat directly call the SSL_select_next_proto function with a 0 length list ofsupported client protocols are affected by this issue. This would normally neverbe a valid scenario and is typically not under attacker control but may occur byaccident in the case of a configuration or programming error in the callingapplication. The OpenSSL API function SSL_select_next_proto is typically used by TLSapplications that support ALPN (Application Layer Protocol Negotiation) or NPN(Next Protocol Negotiation). NPN is older, was never standardised andis deprecated in favour of ALPN. We believe that ALPN is significantly morewidely deployed than NPN. The SSL_select_next_proto function accepts a list ofprotocols from the server and a list of protocols from the client and returnsthe first protocol that appears in the server list that also appears in theclient list. In the…Read More