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Upgraded SHA-1 key signatures from warnings to failures. Added deprecation warning to ssh-rsa-cert-v00@openssh.com, ssh-rsa-cert-v01@openssh.com, x509v3-sign-rsa, and x509v3-ssh-rsa host key types.

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This commit is contained in:
Joe Testa 2021-02-01 19:19:46 -05:00
parent dbe14a075e
commit c49a0fb22f
12 changed files with 40 additions and 17 deletions
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2
README.md
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@ -161,6 +161,8 @@ For convenience, a web front-end on top of the command-line tool is available at
### v2.4.0-dev (???)
- Added multi-threaded scanning support.
- Added version check for OpenSSH user enumeration (CVE-2018-15473).
- Added deprecation note to host key types based on SHA-1.
- Upgraded warnings to failures for host key types based on SHA-1.
- Fixed crash when receiving unexpected response during host key test.
- Fixed hang against older Cisco devices during host key test & gex test.
- Fixed improper termination while scanning multiple targets when one target returns an error.

12
src/ssh_audit/hostkeytest.py
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@ -155,12 +155,20 @@ class HostKeyTest:
if (cert is False) and (hostkey_modulus_size < 2048):
for rsa_type in HostKeyTest.RSA_FAMILY:
alg_list = SSH2_KexDB.ALGORITHMS['key'][rsa_type]
alg_list.append(['using small %d-bit modulus' % hostkey_modulus_size])
# If no failure list exists, add an empty failure list.
if len(alg_list) < 2:
alg_list.append([])
alg_list[1].append('using small %d-bit modulus' % hostkey_modulus_size)
elif (cert is True) and ((hostkey_modulus_size < 2048) or (ca_modulus_size > 0 and ca_modulus_size < 2048)): # pylint: disable=chained-comparison
alg_list = SSH2_KexDB.ALGORITHMS['key'][host_key_type]
min_modulus = min(hostkey_modulus_size, ca_modulus_size)
min_modulus = min_modulus if min_modulus > 0 else max(hostkey_modulus_size, ca_modulus_size)
alg_list.append(['using small %d-bit modulus' % min_modulus])
# If no failure list exists, add an empty failure list.
if len(alg_list) < 2:
alg_list.append([])
alg_list[1].append('using small %d-bit modulus' % min_modulus)
# If this host key type is in the RSA family, then mark them all as parsed (since results in one are valid for them all).
if host_key_type in HostKeyTest.RSA_FAMILY:

13
src/ssh_audit/ssh2_kexdb.py
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@ -37,7 +37,7 @@ class SSH2_KexDB: # pylint: disable=too-few-public-methods
FAIL_OPENSSH67_UNSAFE = 'removed (in server) since OpenSSH 6.7, unsafe algorithm'
FAIL_OPENSSH61_REMOVE = 'removed since OpenSSH 6.1, removed from specification'
FAIL_OPENSSH31_REMOVE = 'removed since OpenSSH 3.1'
INFO_OPENSSH82_FUTURE_DEPRECATION = 'A future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2'
INFO_OPENSSH82_FUTURE_DEPRECATION = 'a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2'
FAIL_DBEAR67_DISABLED = 'disabled since Dropbear SSH 2015.67'
FAIL_DBEAR53_DISABLED = 'disabled since Dropbear SSH 0.53'
FAIL_DEPRECATED_CIPHER = 'deprecated cipher'
@ -47,6 +47,7 @@ class SSH2_KexDB: # pylint: disable=too-few-public-methods
FAIL_DEPRECATED_MAC = 'deprecated MAC'
FAIL_1024BIT_MODULUS = 'using small 1024-bit modulus'
FAIL_UNPROVEN = 'using unproven algorithm'
FAIL_HASH_WEAK = 'using weak hashing algorithm'
WARN_CURVES_WEAK = 'using weak elliptic curves'
WARN_RNDSIG_KEY = 'using weak random number generator could reveal the key'
WARN_HASH_WEAK = 'using weak hashing algorithm'
@ -128,20 +129,20 @@ class SSH2_KexDB: # pylint: disable=too-few-public-methods
'rsa-sha2-512': [['7.2']],
'ssh-ed25519': [['6.5,l10.7.0']],
'ssh-ed25519-cert-v01@openssh.com': [['6.5']],
'ssh-rsa': [['2.5.0,d0.28,l10.2'], [WARN_HASH_WEAK], [], [INFO_OPENSSH82_FUTURE_DEPRECATION]],
'ssh-rsa': [['2.5.0,d0.28,l10.2'], [FAIL_HASH_WEAK], [], [INFO_OPENSSH82_FUTURE_DEPRECATION]],
'ssh-dss': [['2.1.0,d0.28,l10.2', '6.9'], [FAIL_1024BIT_MODULUS, FAIL_OPENSSH70_WEAK], [WARN_RNDSIG_KEY]],
'ecdsa-sha2-nistp256': [['5.7,d2013.62,l10.6.4'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]],
'ecdsa-sha2-nistp384': [['5.7,d2013.62,l10.6.4'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]],
'ecdsa-sha2-nistp521': [['5.7,d2013.62,l10.6.4'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]],
'ecdsa-sha2-1.3.132.0.10': [[], [], [WARN_RNDSIG_KEY]], # ECDSA over secp256k1 (i.e.: the Bitcoin curve)
'x509v3-sign-dss': [[], [FAIL_1024BIT_MODULUS, FAIL_OPENSSH70_WEAK], [WARN_RNDSIG_KEY]],
'x509v3-sign-rsa': [[], [], [WARN_HASH_WEAK]],
'x509v3-sign-rsa': [[], [FAIL_HASH_WEAK], [], [INFO_OPENSSH82_FUTURE_DEPRECATION]],
'x509v3-sign-rsa-sha256@ssh.com': [[]],
'x509v3-ssh-dss': [[], [FAIL_1024BIT_MODULUS, FAIL_OPENSSH70_WEAK], [WARN_RNDSIG_KEY]],
'x509v3-ssh-rsa': [[], [], [WARN_HASH_WEAK]],
'ssh-rsa-cert-v00@openssh.com': [['5.4', '6.9'], [FAIL_OPENSSH70_LEGACY], []],
'x509v3-ssh-rsa': [[], [FAIL_HASH_WEAK], [], [INFO_OPENSSH82_FUTURE_DEPRECATION]],
'ssh-rsa-cert-v00@openssh.com': [['5.4', '6.9'], [FAIL_OPENSSH70_LEGACY, FAIL_HASH_WEAK], [], [INFO_OPENSSH82_FUTURE_DEPRECATION]],
'ssh-dss-cert-v00@openssh.com': [['5.4', '6.9'], [FAIL_1024BIT_MODULUS, FAIL_OPENSSH70_LEGACY], [WARN_RNDSIG_KEY]],
'ssh-rsa-cert-v01@openssh.com': [['5.6'], [WARN_HASH_WEAK]],
'ssh-rsa-cert-v01@openssh.com': [['5.6'], [FAIL_HASH_WEAK], [], [INFO_OPENSSH82_FUTURE_DEPRECATION]],
'ssh-dss-cert-v01@openssh.com': [['5.6', '6.9'], [FAIL_1024BIT_MODULUS, FAIL_OPENSSH70_WEAK], [WARN_RNDSIG_KEY]],
'ecdsa-sha2-nistp256-cert-v01@openssh.com': [['5.7'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]],
'ecdsa-sha2-nistp384-cert-v01@openssh.com': [['5.7'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]],

3
test/docker/expected_results/dropbear_2019.78_test1.txt
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@ -23,8 +23,9 @@
 `- [warn] using weak random number generator could reveal the key
`- [info] available since OpenSSH 5.7, Dropbear SSH 2013.62
(key) ssh-rsa (1024-bit) -- [fail] using weak hashing algorithm
 `- [warn] using small 1024-bit modulus
 `- [fail] using small 1024-bit modulus
`- [info] available since OpenSSH 2.5.0, Dropbear SSH 0.28
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
(key) ssh-dss -- [fail] using small 1024-bit modulus
 `- [fail] removed (in server) and disabled (in client) since OpenSSH 7.0, weak algorithm
 `- [warn] using weak random number generator could reveal the key

3
test/docker/expected_results/openssh_4.0p1_test1.txt
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@ -40,8 +40,9 @@
# host-key algorithms
(key) ssh-rsa (1024-bit) -- [fail] using weak hashing algorithm
 `- [warn] using small 1024-bit modulus
 `- [fail] using small 1024-bit modulus
`- [info] available since OpenSSH 2.5.0, Dropbear SSH 0.28
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
(key) ssh-dss -- [fail] using small 1024-bit modulus
 `- [fail] removed (in server) and disabled (in client) since OpenSSH 7.0, weak algorithm
 `- [warn] using weak random number generator could reveal the key

3
test/docker/expected_results/openssh_5.6p1_test1.txt
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@ -34,8 +34,9 @@
# host-key algorithms
(key) ssh-rsa (1024-bit) -- [fail] using weak hashing algorithm
 `- [warn] using small 1024-bit modulus
 `- [fail] using small 1024-bit modulus
`- [info] available since OpenSSH 2.5.0, Dropbear SSH 0.28
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
(key) ssh-dss -- [fail] using small 1024-bit modulus
 `- [fail] removed (in server) and disabled (in client) since OpenSSH 7.0, weak algorithm
 `- [warn] using weak random number generator could reveal the key

6
test/docker/expected_results/openssh_5.6p1_test2.txt
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@ -34,11 +34,13 @@
# host-key algorithms
(key) ssh-rsa (1024-bit) -- [fail] using weak hashing algorithm
 `- [warn] using small 1024-bit modulus
 `- [fail] using small 1024-bit modulus
`- [info] available since OpenSSH 2.5.0, Dropbear SSH 0.28
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
(key) ssh-rsa-cert-v01@openssh.com (1024-bit cert/1024-bit CA) -- [fail] using weak hashing algorithm
 `- [warn] using small 1024-bit modulus
 `- [fail] using small 1024-bit modulus
`- [info] available since OpenSSH 5.6
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
# encryption algorithms (ciphers)
(enc) aes128-ctr -- [info] available since OpenSSH 3.7, Dropbear SSH 0.52

6
test/docker/expected_results/openssh_5.6p1_test3.txt
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@ -34,11 +34,13 @@
# host-key algorithms
(key) ssh-rsa (1024-bit) -- [fail] using weak hashing algorithm
 `- [warn] using small 1024-bit modulus
 `- [fail] using small 1024-bit modulus
`- [info] available since OpenSSH 2.5.0, Dropbear SSH 0.28
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
(key) ssh-rsa-cert-v01@openssh.com (1024-bit cert/3072-bit CA) -- [fail] using weak hashing algorithm
 `- [warn] using small 1024-bit modulus
 `- [fail] using small 1024-bit modulus
`- [info] available since OpenSSH 5.6
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
# encryption algorithms (ciphers)
(enc) aes128-ctr -- [info] available since OpenSSH 3.7, Dropbear SSH 0.52

4
test/docker/expected_results/openssh_5.6p1_test4.txt
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@ -35,9 +35,11 @@
# host-key algorithms
(key) ssh-rsa (3072-bit) -- [fail] using weak hashing algorithm
`- [info] available since OpenSSH 2.5.0, Dropbear SSH 0.28
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
(key) ssh-rsa-cert-v01@openssh.com (3072-bit cert/1024-bit CA) -- [fail] using weak hashing algorithm
 `- [warn] using small 1024-bit modulus
 `- [fail] using small 1024-bit modulus
`- [info] available since OpenSSH 5.6
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
# encryption algorithms (ciphers)
(enc) aes128-ctr -- [info] available since OpenSSH 3.7, Dropbear SSH 0.52

2
test/docker/expected_results/openssh_5.6p1_test5.txt
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@ -35,8 +35,10 @@
# host-key algorithms
(key) ssh-rsa (3072-bit) -- [fail] using weak hashing algorithm
`- [info] available since OpenSSH 2.5.0, Dropbear SSH 0.28
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
(key) ssh-rsa-cert-v01@openssh.com (3072-bit cert/3072-bit CA) -- [fail] using weak hashing algorithm
`- [info] available since OpenSSH 5.6
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
# encryption algorithms (ciphers)
(enc) aes128-ctr -- [info] available since OpenSSH 3.7, Dropbear SSH 0.52

1
test/docker/expected_results/openssh_8.0p1_test1.txt
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@ -25,6 +25,7 @@
(key) rsa-sha2-256 (3072-bit) -- [info] available since OpenSSH 7.2
(key) ssh-rsa (3072-bit) -- [fail] using weak hashing algorithm
`- [info] available since OpenSSH 2.5.0, Dropbear SSH 0.28
`- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2
(key) ecdsa-sha2-nistp256 -- [fail] using weak elliptic curves
 `- [warn] using weak random number generator could reveal the key
`- [info] available since OpenSSH 5.7, Dropbear SSH 2013.62

2
test/test_ssh2.py
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@ -147,7 +147,7 @@ class TestSSH2:
self.audit(out, self._conf())
out.write()
lines = output_spy.flush()
assert len(lines) == 69
assert len(lines) == 70
def test_ssh2_server_invalid_first_packet(self, output_spy, virtual_socket):
vsocket = virtual_socket