Python http.client HTTP Tunnel Injection Vulnerability Fix Analysis

Vulnerability Overview This vulnerability involves the rejection of CR/LF characters in HTTP tunnel request headers. Specifically, when an attempt is made to include control characters (such as CR/LF) in HTTP tunnel request headers, the system throws a exception with the message "Tunnel host can't contain control characters". Impact Scope This vulnerability affects Python applications that use the module for HTTP tunnel connections. Any code attempting to insert control characters into tunnel request headers will trigger this exception, potentially leading to connection failures or security vulnerabilities. Remediation The fix involves adding checks for control characters in the tunnel host and request headers within the file. The specific modifications are as follows: 1. Check Tunnel Host: 2. Check Request Headers: Proof of Concept (POC) Code Below is POC code for testing invalid tunnel request headers: ```python def test_invalid_headers(self): with self.assertRaisesRegex(ValueError, 'Invalid header'): conn.putheader(name, value) def test_invalid_tunnel_headers(self): cases = { ('invalid\rName', 'ValidValue'), ('invalid\rName', 'ValidValue\r'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidValue\r\n'), ('invalid\rName', 'ValidVal

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Python http.client HTTP Tunnel Injection Vulnerability Fix Analysis

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