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Fixed crash when receiving unexpected response during host key test.

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This commit is contained in:
Joe Testa 2020-11-05 20:29:39 -05:00
parent 52d1e8f27b
commit 338ffc5adb
2 changed files with 7 additions and 3 deletions
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1
README.md
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@ -159,6 +159,7 @@ For convenience, a web front-end on top of the command-line tool is available at
## ChangeLog
### v2.4.0-dev (???)
- Added version check for OpenSSH user enumeration (CVE-2018-15473).
- Fixed crash when receiving unexpected response during host key test.
### v2.3.1 (2020-10-28)
- Now parses public key sizes for `rsa-sha2-256-cert-v01@openssh.com` and `rsa-sha2-512-cert-v01@openssh.com` host key types.

9
src/ssh_audit/hostkeytest.py
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@ -135,9 +135,12 @@ class HostKeyTest:
# Do the initial DH exchange. The server responds back
# with the host key and its length. Bingo. We also get back the host key fingerprint.
kex_group.send_init(s)
host_key = kex_group.recv_reply(s, variable_key_len)
if host_key is not None:
server_kex.set_host_key(host_key_type, host_key)
try:
host_key = kex_group.recv_reply(s, variable_key_len)
if host_key is not None:
server_kex.set_host_key(host_key_type, host_key)
except Exception:
pass
hostkey_modulus_size = kex_group.get_hostkey_size()
ca_modulus_size = kex_group.get_ca_size()