Oracle Linux: CVE-2023-40217: ELSA-2023-6823: python3 security update (IMPORTANT) (Multiple Advisories)

Description

An issue was discovered in Python before 3.8.18, 3.9.x before 3.9.18, 3.10.x before 3.10.13, and 3.11.x before 3.11.5. It primarily affects servers (such as HTTP servers) that use TLS client authentication. If a TLS server-side socket is created, receives data into the socket buffer, and then is closed quickly, there is a brief window where the SSLSocket instance will detect the socket as "not connected" and won't initiate a handshake, but buffered data will still be readable from the socket buffer. This data will not be authenticated if the server-side TLS peer is expecting client certificate authentication, and is indistinguishable from valid TLS stream data. Data is limited in size to the amount that will fit in the buffer. (The TLS connection cannot directly be used for data exfiltration because the vulnerable code path requires that the connection be closed on initialization of the SSLSocket.) Python ssl.SSLSocket is vulnerable to a bypass of the TLS handshake in certain instances for HTTPS servers and other server-side protocols that use TLS client authentication such as mTLS. This issue may result in a breach of integrity as its possible to modify or delete resources that are authenticated only by a TLS certificate. No breach of confidentiality is possible.