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Removed CBC ciphers to address CVE-2013-0169 (LUCKY13) #1051

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Removed CBC ciphers to address CVE-2013-0169 (LUCKY13) #1051

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16 changes: 16 additions & 0 deletions prometheus_client/exposition.py
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Original file line number Diff line number Diff line change
Expand Up @@ -170,6 +170,22 @@ def _get_ssl_ctx(
"""Load context supports SSL."""
ssl_cxt = ssl.SSLContext(protocol=protocol)

# The following chipers will be removed if the default cipher set contains
# them. The reason for each cipher is stated in the comment.
remove_cipher_names = [
"ECDHE-ECDSA-AES256-SHA384", # is a CBC cipher (CVE-2013-0169)
"ECDHE-RSA-AES256-SHA384", # is a CBC cipher (CVE-2013-0169)
"ECDHE-ECDSA-AES128-SHA256", # is a CBC cipher (CVE-2013-0169)
"ECDHE-RSA-AES128-SHA256", # is a CBC cipher (CVE-2013-0169)
]
cipher_names = [c['name'] for c in ssl_cxt.get_ciphers()]
for cipher_name in remove_cipher_names:
try:
cipher_names.remove(cipher_name)
except ValueError:
pass
ssl_cxt.set_ciphers(':'.join(cipher_names))

if cafile is not None or capath is not None:
try:
ssl_cxt.load_verify_locations(cafile, capath)
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