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Now issues a warning when 2048-bit moduli are encountered.

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This commit is contained in:
Joe Testa
2023-02-06 16:27:30 -05:00
parent f9e00b6f2d
commit c9dc9a9c10
17 changed files with 93 additions and 42 deletions
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5
test/docker/expected_results/dropbear_2019.78_test1.txt
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@ -13,8 +13,10 @@
`- [info] available since OpenSSH 5.7, Dropbear SSH 2013.62
(kex) ecdh-sha2-nistp256 -- [fail] using weak elliptic curves
`- [info] available since OpenSSH 5.7, Dropbear SSH 2013.62
(kex) diffie-hellman-group14-sha256 -- [info] available since OpenSSH 7.3, Dropbear SSH 2016.73
(kex) diffie-hellman-group14-sha256 -- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 7.3, Dropbear SSH 2016.73
(kex) diffie-hellman-group14-sha1 -- [warn] using weak hashing algorithm
 `- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 3.9, Dropbear SSH 0.53
(kex) kexguess2@matt.ucc.asn.au -- [info] available since Dropbear SSH 2013.57
@ -80,6 +82,7 @@
(rec) +twofish128-ctr -- enc algorithm to append 
(rec) +twofish256-ctr -- enc algorithm to append 
(rec) -diffie-hellman-group14-sha1 -- kex algorithm to remove 
(rec) -diffie-hellman-group14-sha256 -- kex algorithm to remove 
(rec) -hmac-sha1 -- mac algorithm to remove 
(rec) -hmac-sha2-256 -- mac algorithm to remove 

1
test/docker/expected_results/openssh_4.0p1_test1.txt
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@ -35,6 +35,7 @@
 `- [warn] using weak hashing algorithm
`- [info] available since OpenSSH 2.3.0
(kex) diffie-hellman-group14-sha1 -- [warn] using weak hashing algorithm
 `- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 3.9, Dropbear SSH 0.53
(kex) diffie-hellman-group1-sha1 -- [fail] using small 1024-bit modulus
 `- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm

3
test/docker/expected_results/openssh_5.6p1_test1.txt
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@ -28,6 +28,7 @@
 `- [warn] using weak hashing algorithm
`- [info] available since OpenSSH 2.3.0
(kex) diffie-hellman-group14-sha1 -- [warn] using weak hashing algorithm
 `- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 3.9, Dropbear SSH 0.53
(kex) diffie-hellman-group1-sha1 -- [fail] using small 1024-bit modulus
 `- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm
@ -127,7 +128,7 @@
(fin) ssh-rsa: SHA256:YZ457EBcJTSxRKI3yXRgtAj3PBf5B9/F36b1SVooml4
# algorithm recommendations (for OpenSSH 5.6)
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 2048 bits or larger) 
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 3072 bits or larger) 
(rec) -3des-cbc -- enc algorithm to remove 
(rec) -aes128-cbc -- enc algorithm to remove 
(rec) -aes192-cbc -- enc algorithm to remove 

3
test/docker/expected_results/openssh_5.6p1_test2.txt
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@ -28,6 +28,7 @@
 `- [warn] using weak hashing algorithm
`- [info] available since OpenSSH 2.3.0
(kex) diffie-hellman-group14-sha1 -- [warn] using weak hashing algorithm
 `- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 3.9, Dropbear SSH 0.53
(kex) diffie-hellman-group1-sha1 -- [fail] using small 1024-bit modulus
 `- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm
@ -127,7 +128,7 @@
(fin) ssh-rsa: SHA256:YZ457EBcJTSxRKI3yXRgtAj3PBf5B9/F36b1SVooml4
# algorithm recommendations (for OpenSSH 5.6)
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 2048 bits or larger) 
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 3072 bits or larger) 
(rec) -3des-cbc -- enc algorithm to remove 
(rec) -aes128-cbc -- enc algorithm to remove 
(rec) -aes192-cbc -- enc algorithm to remove 

3
test/docker/expected_results/openssh_5.6p1_test3.txt
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@ -28,6 +28,7 @@
 `- [warn] using weak hashing algorithm
`- [info] available since OpenSSH 2.3.0
(kex) diffie-hellman-group14-sha1 -- [warn] using weak hashing algorithm
 `- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 3.9, Dropbear SSH 0.53
(kex) diffie-hellman-group1-sha1 -- [fail] using small 1024-bit modulus
 `- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm
@ -127,7 +128,7 @@
(fin) ssh-rsa: SHA256:YZ457EBcJTSxRKI3yXRgtAj3PBf5B9/F36b1SVooml4
# algorithm recommendations (for OpenSSH 5.6)
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 2048 bits or larger) 
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 3072 bits or larger) 
(rec) -3des-cbc -- enc algorithm to remove 
(rec) -aes128-cbc -- enc algorithm to remove 
(rec) -aes192-cbc -- enc algorithm to remove 

3
test/docker/expected_results/openssh_5.6p1_test4.txt
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@ -28,6 +28,7 @@
 `- [warn] using weak hashing algorithm
`- [info] available since OpenSSH 2.3.0
(kex) diffie-hellman-group14-sha1 -- [warn] using weak hashing algorithm
 `- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 3.9, Dropbear SSH 0.53
(kex) diffie-hellman-group1-sha1 -- [fail] using small 1024-bit modulus
 `- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm
@ -126,7 +127,7 @@
(fin) ssh-rsa: SHA256:nsWtdJ9Z67Vrf7OsUzQov7esXhsWAfVppArGh25u244
# algorithm recommendations (for OpenSSH 5.6)
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 2048 bits or larger) 
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 3072 bits or larger) 
(rec) -3des-cbc -- enc algorithm to remove 
(rec) -aes128-cbc -- enc algorithm to remove 
(rec) -aes192-cbc -- enc algorithm to remove 

3
test/docker/expected_results/openssh_5.6p1_test5.txt
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@ -28,6 +28,7 @@
 `- [warn] using weak hashing algorithm
`- [info] available since OpenSSH 2.3.0
(kex) diffie-hellman-group14-sha1 -- [warn] using weak hashing algorithm
 `- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 3.9, Dropbear SSH 0.53
(kex) diffie-hellman-group1-sha1 -- [fail] using small 1024-bit modulus
 `- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm
@ -125,7 +126,7 @@
(fin) ssh-rsa: SHA256:nsWtdJ9Z67Vrf7OsUzQov7esXhsWAfVppArGh25u244
# algorithm recommendations (for OpenSSH 5.6)
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 2048 bits or larger) 
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 3072 bits or larger) 
(rec) -3des-cbc -- enc algorithm to remove 
(rec) -aes128-cbc -- enc algorithm to remove 
(rec) -aes192-cbc -- enc algorithm to remove 

9
test/docker/expected_results/openssh_8.0p1_test1.txt
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@ -19,11 +19,14 @@
`- [info] available since OpenSSH 5.7, Dropbear SSH 2013.62
(kex) ecdh-sha2-nistp521 -- [fail] using weak elliptic curves
`- [info] available since OpenSSH 5.7, Dropbear SSH 2013.62
(kex) diffie-hellman-group-exchange-sha256 (2048-bit) -- [info] available since OpenSSH 4.4
(kex) diffie-hellman-group-exchange-sha256 (2048-bit) -- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 4.4
(kex) diffie-hellman-group16-sha512 -- [info] available since OpenSSH 7.3, Dropbear SSH 2016.73
(kex) diffie-hellman-group18-sha512 -- [info] available since OpenSSH 7.3
(kex) diffie-hellman-group14-sha256 -- [info] available since OpenSSH 7.3, Dropbear SSH 2016.73
(kex) diffie-hellman-group14-sha256 -- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 7.3, Dropbear SSH 2016.73
(kex) diffie-hellman-group14-sha1 -- [warn] using weak hashing algorithm
 `- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 3.9, Dropbear SSH 0.53
# host-key algorithms
@ -72,12 +75,14 @@
(fin) ssh-rsa: SHA256:nsWtdJ9Z67Vrf7OsUzQov7esXhsWAfVppArGh25u244
# algorithm recommendations (for OpenSSH 8.0)
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 3072 bits or larger) 
(rec) -ecdh-sha2-nistp256 -- kex algorithm to remove 
(rec) -ecdh-sha2-nistp384 -- kex algorithm to remove 
(rec) -ecdh-sha2-nistp521 -- kex algorithm to remove 
(rec) -ecdsa-sha2-nistp256 -- key algorithm to remove 
(rec) -ssh-rsa -- key algorithm to remove 
(rec) -diffie-hellman-group14-sha1 -- kex algorithm to remove 
(rec) -diffie-hellman-group14-sha256 -- kex algorithm to remove 
(rec) -hmac-sha1 -- mac algorithm to remove 
(rec) -hmac-sha1-etm@openssh.com -- mac algorithm to remove 
(rec) -hmac-sha2-256 -- mac algorithm to remove 

9
test/docker/expected_results/openssh_8.0p1_test2.txt
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@ -19,11 +19,14 @@
`- [info] available since OpenSSH 5.7, Dropbear SSH 2013.62
(kex) ecdh-sha2-nistp521 -- [fail] using weak elliptic curves
`- [info] available since OpenSSH 5.7, Dropbear SSH 2013.62
(kex) diffie-hellman-group-exchange-sha256 (2048-bit) -- [info] available since OpenSSH 4.4
(kex) diffie-hellman-group-exchange-sha256 (2048-bit) -- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 4.4
(kex) diffie-hellman-group16-sha512 -- [info] available since OpenSSH 7.3, Dropbear SSH 2016.73
(kex) diffie-hellman-group18-sha512 -- [info] available since OpenSSH 7.3
(kex) diffie-hellman-group14-sha256 -- [info] available since OpenSSH 7.3, Dropbear SSH 2016.73
(kex) diffie-hellman-group14-sha256 -- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 7.3, Dropbear SSH 2016.73
(kex) diffie-hellman-group14-sha1 -- [warn] using weak hashing algorithm
 `- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 3.9, Dropbear SSH 0.53
# host-key algorithms
@ -64,12 +67,14 @@
(fin) ssh-ed25519: SHA256:UrnXIVH+7dlw8UqYocl48yUEcKrthGDQG2CPCgp7MxU
# algorithm recommendations (for OpenSSH 8.0)
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 3072 bits or larger) 
(rec) -ecdh-sha2-nistp256 -- kex algorithm to remove 
(rec) -ecdh-sha2-nistp384 -- kex algorithm to remove 
(rec) -ecdh-sha2-nistp521 -- kex algorithm to remove 
(rec) +rsa-sha2-256 -- key algorithm to append 
(rec) +rsa-sha2-512 -- key algorithm to append 
(rec) -diffie-hellman-group14-sha1 -- kex algorithm to remove 
(rec) -diffie-hellman-group14-sha256 -- kex algorithm to remove 
(rec) -hmac-sha1 -- mac algorithm to remove 
(rec) -hmac-sha1-etm@openssh.com -- mac algorithm to remove 
(rec) -hmac-sha2-256 -- mac algorithm to remove 

8
test/docker/expected_results/openssh_8.0p1_test3.txt
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@ -13,7 +13,8 @@
# key exchange algorithms
(kex) curve25519-sha256 -- [info] available since OpenSSH 7.4, Dropbear SSH 2018.76
(kex) curve25519-sha256@libssh.org -- [info] available since OpenSSH 6.5, Dropbear SSH 2013.62
(kex) diffie-hellman-group-exchange-sha256 (2048-bit) -- [info] available since OpenSSH 4.4
(kex) diffie-hellman-group-exchange-sha256 (2048-bit) -- [warn] 2048-bit modulus only provides 112-bits of symmetric strength
`- [info] available since OpenSSH 4.4
# host-key algorithms
(key) ssh-ed25519 -- [info] available since OpenSSH 6.5
@ -36,9 +37,12 @@
(fin) ssh-ed25519: SHA256:UrnXIVH+7dlw8UqYocl48yUEcKrthGDQG2CPCgp7MxU
# algorithm recommendations (for OpenSSH 8.0)
(rec) +diffie-hellman-group14-sha256 -- kex algorithm to append 
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 3072 bits or larger) 
(rec) +diffie-hellman-group16-sha512 -- kex algorithm to append 
(rec) +diffie-hellman-group18-sha512 -- kex algorithm to append 
(rec) +rsa-sha2-256 -- key algorithm to append 
(rec) +rsa-sha2-512 -- key algorithm to append 
# additional info
(nfo) For hardening guides on common OSes, please see: <https://www.ssh-audit.com/hardening_guides.html>