How to disable weak cipher protocols and keys from ssh on azure devops server - Microsoft Q&A (2024)

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How to disable weak cipher protocols and keys from ssh on azure devops server - Microsoft Q&A? ›

2 answers. Normally to disable weak ciphers on a Windows server you just run IISCrypto and disable the protocols that you don't want. Reboot the machine and they are no longer available. You should google for the recommended ones to disable as the landscape changes.

Let's say, based from the list of supported TLS cipher suites, we would like to disable all the cipher suites that are weaker than TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA . In order to do this, we can call the Update Config API to set the property minTlsCipherSuite to TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA .

To fix the SSH Server CBC Mode Ciphers Enabled vulnerability, edit the SSH configuration file (/etc/ssh/sshd_config) and disable CBC mode ciphers by adding or modifying the Ciphers line. For example, set it to Ciphers aes256-ctr,aes192-ctr,aes128-ctr. Restart the SSH service for changes to take effect.

Normally to disable weak ciphers on a Windows server you just run IISCrypto and disable the protocols that you don't want. Reboot the machine and they are no longer available.

How to fix. To stop using weak cipher suites, you must configure your web server cipher suite list accordingly. Ideally, as a general guideline, you should remove any cipher suite containing references to NULL, anonymous, export, DES, 3DES, RC4, and MD5 algorithms.

These weak algorithms include DES (Data Encryption Standard), RC4 (Rivest Cipher 4), MD5 (Message Digest Algorithm 5), and others that are problematic in terms of security.

How do I disable RSA key exchange ciphers? ›

The SSH server is configured to support Cipher Block Chaining (CBC) encryption. This may allow an attacker to recover the plain text message from the ciphertext. Note that this plugin only checks for the options of the SSH server and does not check for vulnerable software versions.

In summary to disable ssl-static-key-ciphers, you will need to remove RSA from the httpd configuration. To disable ssl-static-key-ciphers, you will need to add ! RSA to the httpd configuration.

In this manner any server or client that is talking to a client or server that must use RC4, can prevent a connection from happening. Clients that deploy this setting will not be able to connect to sites that require RC4 while servers that deploy this setting will not be able to service clients that must use RC4.

Go to "Encryption Settings" and uncheck " "enable RC4-Only Cipher suite support". NOTE: the device will need a reboot.

To disable MFA for a user, Sign in to the Azure portal with your admin credentials > Go to Azure Active Directory > Select Users > Select the user you want to disable MFA for > Select Authentication methods > Under MFA, select Disable > Select Save.

To configure a minimum TLS cipher suite, select a TLS cipher suite from the dropdown that you would like to configure as the minimum for the site. Once you selected a minimum TLS cipher suite, you will see a change in the original list reflecting what TLS cipher suites will be enabled/disabled based on your selection.

05 Click on the name (link) of the Azure API Management service that you want to examine. 06 In the navigation panel, under Security, select Protocols + ciphers to access the API gateway's protocol and cipher configuration.