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controller: Handle UnicodeDecodeError from webob decoding invalid URLs
webob will try to utf-8 decode all %-encoded bytes in URL-parameters, but will
not handle Unicode erors ... and neither did Kallithea. Visiting a URL like
http://localhost:5000/?%AD would thus give an unhandled exception showing
"Internal Server Error" to the user, and logging the full traceback and:
WebApp Error: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xad in position 0: invalid start byte
This has been seen a lot recently from attackers probing for a php
vulnerability
https://devco.re/blog/2024/06/06/security-alert-cve-2024-4577-php-cgi-argument-injection-vulnerability-en/ .
Now handle these exceptions more nicely and reject with "400 Bad Request".
webob will try to utf-8 decode all %-encoded bytes in URL-parameters, but will
not handle Unicode erors ... and neither did Kallithea. Visiting a URL like
http://localhost:5000/?%AD would thus give an unhandled exception showing
"Internal Server Error" to the user, and logging the full traceback and:
WebApp Error: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xad in position 0: invalid start byte
This has been seen a lot recently from attackers probing for a php
vulnerability
https://devco.re/blog/2024/06/06/security-alert-cve-2024-4577-php-cgi-argument-injection-vulnerability-en/ .
Now handle these exceptions more nicely and reject with "400 Bad Request".
51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 abb83e4edfd9 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 abb83e4edfd9 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 51af7c12ffb1 | #!/usr/bin/env python3
"""
pyflakes with filter configuration for Kallithea.
Inspired by pyflakes/api.py and flake8/plugins/pyflakes.py .
"""
import sys
import pyflakes.api
import pyflakes.messages
class Reporter:
warned = False
def flake(self, warning):
# ignore known warnings
if isinstance(warning, pyflakes.messages.UnusedVariable):
return
if warning.filename == 'kallithea/bin/kallithea_cli_ishell.py':
if isinstance(warning, pyflakes.messages.ImportStarUsed) and warning.message_args == ('kallithea.model.db',):
return
if isinstance(warning, pyflakes.messages.UnusedImport) and warning.message_args == ('kallithea.model.db.*',):
return
print('%s:%s %s [%s %s]' % (warning.filename, warning.lineno, warning.message % warning.message_args, type(warning).__name__, warning.message_args))
self.warned = True
def unexpectedError(self, filename, msg):
print('Unexpected error for %s: %s' % (filename, msg))
reporter = Reporter()
for filename in sorted(set(sys.argv[1:])):
pyflakes.api.checkPath(filename, reporter=reporter)
if reporter.warned:
raise SystemExit(1)
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