Connectrix MDS serie: SSL- of TLS-server ondersteunt Transport Layer Security TLS1.1

"Secure Sockets Layer (SSL) of Transport Layer Security (TLS) server ondersteunt Transport Layer Security (TLSv1.1)"

Threat: The scan target supports version 1.1 of the TLS protocol. That version is in the process of being deprecated and is no longer recommended. Instead the newer versions 1.2 and/or 1.3 should be used. The TLSv1.1 protocol itself does not have any currently exploitable vulnerabilities. However some vendor implementations of TLSv1.1 have weaknesses which may be exploitable. This QID is posted as potential, when servers require client certificates and we cannot complete the handshake.

Resultaten: TLSv1.1 wordt ondersteund.

Solution: Disable the use of TLSv1.1 protocol in favor of a cryptographically stronger protocol such as TLSv1.2.
The following openssl commands can be used to do a manual test: openssl s_client -connect ip:port -tls1_1
If the test is successful, then the target support TLSv1.1.

Leg de uitvoer van de onderstaande opdracht van de switch vast:

`show file volatile:///nxapi.log`

HTTPS port is 8443
Options gathered - vdc: 1, servers: 4, http: -1, https: 8443,
cert: /var/nginx/cert/server.crt_vdc_1, key: /var/nginx/cert/server.key_vdc_1, sandbox: false, protocols: TLSv1.2, ciphers: false

Dit betekent dat TLS 1.0 en 1.1 zijn uitgeschakeld en TLSv1.2 is ingeschakeld op de switch. Daarom kan de beveiligingslek worden geconcludeerd als fout-positief.

Als TLSv1 en TLSv1.1 nog steeds worden geaccepteerd, kunt u de gebruikte TLS-versies handmatig configureren:

switch(config)# nxapi ssl protocols TLSv1.2          <--To enable TLSv1.2

switch(config)# no nxapi ssl protocols TLSv1         <--To disable TLSv1-disabling TLSv1 removes TLS 1.0 and 1.1.