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Update openssh MAC algorithims #21

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hestela opened this issue Jul 10, 2018 · 0 comments
Open

Update openssh MAC algorithims #21

hestela opened this issue Jul 10, 2018 · 0 comments

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@hestela
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hestela commented Jul 10, 2018

I got this error message in my openssh server:
Jul 10 14:29:27 machine sshd[11022]: Unable to negotiate with ipaddr port 25555: no matching MAC found. Their offer: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 [preauth]

My server is using openssh-7.6p1. Many of the MACs supported by this app are considered insecure. A newer MAC algorithm should be added. Something like [email protected]

some output from ssh-audit.py:

(mac) hmac-md5                              -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm
                                            `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm
                                            `- [warn] using encrypt-and-MAC mode
                                            `- [warn] using weak hashing algorithm
                                            `- [info] available since OpenSSH 2.1.0, Dropbear SSH 0.28
(mac) hmac-sha1                             -- [warn] using encrypt-and-MAC mode
                                            `- [warn] using weak hashing algorithm
                                            `- [info] available since OpenSSH 2.1.0, Dropbear SSH 0.28
(mac) [email protected]                   -- [warn] using encrypt-and-MAC mode
                                            `- [warn] using small 64-bit tag size
                                            `- [info] available since OpenSSH 4.7

i had to remove: hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
to get my sshd process to start

app error log:

[libsuperuser][O][SH*] no matching mac found: client hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 server [email protected],[email protected],[email protected],hmac-sha2-512,hmac-sha2-256,[email protected]
[libsuperuser][O][SH-] 255
[libsuperuser][C][SH%] END
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