{"id":7814,"date":"2024-09-06T04:36:11","date_gmt":"2024-09-06T04:36:11","guid":{"rendered":"https:\/\/studysection.com\/blog\/?p=7814"},"modified":"2024-09-06T05:47:58","modified_gmt":"2024-09-06T05:47:58","slug":"in-linux-how-to-disable-the-weak-sha1-algorithm-for-sshds","status":"publish","type":"post","link":"https:\/\/studysection.com\/blog\/in-linux-how-to-disable-the-weak-sha1-algorithm-for-sshds\/","title":{"rendered":"In Linux, how to Disable the Weak SHA1 Algorithm for SSHDs"},"content":{"rendered":"

It is recommended that you have a fresh backup of your configuration before attempting to disable weak sha1 ciphers in RedHat<\/a> Linux:<\/p>\n

1. It is recommended that the current sshd_config file be backed up as follows:
\n# cp \/etc\/ssh\/sshd_config \/etc\/ssh\/sshd_config.bck<\/code><\/p>\n

2. edit \/etc\/ssh\/sshd_config
\n# vi \/etc\/ssh\/sshd_config<\/code><\/p>\n

3. You will need to locate the following block:
\n# Using this example, one can see how settings can be overridden by each individual<\/p>\n

Ciphers aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
\nMACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha1-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,hmac-sha1<\/code><\/p>\n

4. In this block, the content should be changed as follows:
\n# This example illustrates how settings can be overridden per user<\/p>\n

Ciphers aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
\nMACs
\nhmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-256
\nkexalgorithms
\necdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256<\/code><\/p>\n

5. Save the file with the :wq command and restart SSH<\/a>:
\n# systemctl restart sshd<\/code><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

It is recommended that you have a fresh backup of your configuration before attempting to disable weak sha1 ciphers in<\/p>\n","protected":false},"author":1,"featured_media":7816,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"acf":[],"yoast_head":"\nIn Linux, how to Disable the Weak SHA1 Algorithm for SSHDs<\/title>\n<meta name=\"description\" content=\"It is recommended that you have a fresh backup of your configuration before attempting to disable weak sha1 ciphers in RedHat Linux.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/studysection.com\/blog\/in-linux-how-to-disable-the-weak-sha1-algorithm-for-sshds\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"In Linux, how 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