Temporal frontend identified with weak/vulnerable ciphers

Community Support
1

We have run sslscan against the grpc frontend and have noticed below ciphers are still supported. However these are vulnerable/weak. We have enabled set of safe ciphers to be used by passing the env
variable GRPC_SSL_CIPHER_SUITES. This hasn’t resolved the problem yet.

GRPC_SSL_CIPHER_SUITES=TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-CHACHA20-POLY1305

=========List of vulnerable ciphers============
Accepted TLSv1.2 128 bits ECDHE-RSA-AES128-SHA Curve 25519 DHE 253
Accepted TLSv1.2 256 bits ECDHE-RSA-AES256-SHA Curve 25519 DHE 253
Accepted TLSv1.2 128 bits AES128-GCM-SHA256
Accepted TLSv1.2 256 bits AES256-GCM-SHA384
Accepted TLSv1.2 128 bits AES128-SHA
Accepted TLSv1.2 256 bits AES256-SHA
Accepted TLSv1.2 112 bits TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
Accepted TLSv1.2 112 bits TLS_RSA_WITH_3DES_EDE_CBC_SHA

Can you please help us to get rid of this ciphers.

2

Thanks for reporting, whats the server version you tested against?

3

We are running against latest 1.18.4 version.

4

Just to update, we have opened GRPC_SSL_CIPHER_SUITES not respected · Issue #3590 · temporalio/temporal · GitHub
Feel free to add more information there if you want. Thanks.

5

Thank you Tihomir, any idea on when can we expect this issue fixed. I suppose there will be a new release version.