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Sanitize NTLM hostname to prevent path traversal and injection #1243

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Sanitize NTLM hostname to prevent path traversal and injection #1243

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68abd12
Sanitize NTLM hostname to prevent path traversal and DoS
TristanInSec May 16, 2026
9c293a8
Warn when NTLM hostname is sanitized
TristanInSec May 18, 2026
ccf36b4
Use display() for sanitization notice so it shows at default verbosity
TristanInSec May 23, 2026
d21ee2d
Merge remote-tracking branch 'upstream/main' into fix/sanitize-ntlm-h…
TristanInSec May 23, 2026
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5 changes: 5 additions & 0 deletions nxc/connection.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
from datetime import datetime
import os
import re
import random
import sys
import contextlib
Expand Down Expand Up @@ -245,6 +246,10 @@ def proto_flow(self):
else:
self.logger.debug("Created connection object")
self.enum_host_info()
sanitized = re.sub(r'[^\w\-.]', '_', self.hostname)
if sanitized != self.hostname:
self.logger.display(f"Hostname contains invalid characters (received: {self.hostname!r}), sanitized to: {sanitized!r}")
self.hostname = sanitized

# Construct the output file template using os.path.join for OS compatibility
base_log_dir = os.path.join(NXC_PATH, "logs")
Expand Down