Connectrix B-Series: The Web Browsers Report "Cipher Mismatch, No Matching Ciphers" When Accessing WebTools UI Using HTTPS
Oversigt: AES256-SHA256 (0x3d) and AES128-SHA256 (0x3c) is blocked for TLS.
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Symptomer
The web browsers (Chrome, New Edge, or Firefox) refused to open the WebTools using HTTPS.
The error message contains "Cipher Mismatch" or "No Matching Ciphers."
Figure 1: Screenshot of Error Message Showing Connection Not Secure, Unsupported Protocol
The switch is running in FOS 8.1 or 8.2 firmware.
The error message contains "Cipher Mismatch" or "No Matching Ciphers."
Figure 1: Screenshot of Error Message Showing Connection Not Secure, Unsupported Protocol
The switch is running in FOS 8.1 or 8.2 firmware.
Årsag
The switch HTTPS cipher setting only allows AES256-SHA256 and AES128-SHA256 for TLS 1.2 (the "default_generic" or "default_strong templates" of FOS 8.1 or 8.2).
The Wireshark dump shows that the client does not accept AES256-SHA256 (0x3d) or AES128-SHA256 (0x3c), hence the TLS handshake fails.
Figure 2: Screenshot of Wireshark Dump Showing Handshake Failure
<switchname>:root> seccryptocfg --show | grep HTTPS HTTPS : !ECDH:!DH:HIGH:-MD5:!CAMELLIA:!SRP:!PSK:!AESGCM:!SSLv3 HTTPS : TLSv1.2 <switchname:root> openssl ciphers -v '!ECDH:!DH:HIGH:-MD5:!CAMELLIA:!SRP:!PSK:!AESGCM:!SSLv3' AES256-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA256 AES128-SHA256 TLSv1.2 Kx=RSA Au=RSA Enc=AES(128) Mac=SHA256
The Wireshark dump shows that the client does not accept AES256-SHA256 (0x3d) or AES128-SHA256 (0x3c), hence the TLS handshake fails.
Figure 2: Screenshot of Wireshark Dump Showing Handshake Failure
Løsning
Modify the switch HTTPS cipher setting to cover the client.
Example:
In this example, the current HTTPS cipher setting is "!ECDH:!DH:HIGH:-MD5:!CAMELLIA:!SRP:!PSK:!AESGCM:!SSLv3"
To enable AES256-GCM-SHA384 (0x9d) and AES128-GCM-SHA256 (0x9c), remove "!AESGCM" from the setting with the command:
Example:
In this example, the current HTTPS cipher setting is "!ECDH:!DH:HIGH:-MD5:!CAMELLIA:!SRP:!PSK:!AESGCM:!SSLv3"
To enable AES256-GCM-SHA384 (0x9d) and AES128-GCM-SHA256 (0x9c), remove "!AESGCM" from the setting with the command:
seccryptocfg --replace -type https -cipher '!ECDH:!DH:HIGH:-MD5:!CAMELLIA:!SRP:!PSK:!SSLv3'
Flere oplysninger
Map OpenSSL cipher names (displayed in the OpenSSL command) with IANA cipher names (displayed in Wireshark dump) using the Mozilla document, Security/Cipher Suites - MozillaWiki
Berørte produkter
Connectrix B-SeriesArtikelegenskaber
Artikelnummer: 000213633
Artikeltype: Solution
Senest ændret: 25 aug. 2023
Version: 5
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