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.)
History

Wed, 02 Oct 2024 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2023-08-25T00:00:00

Updated: 2024-10-02T16:32:08.930Z

Reserved: 2023-08-10T00:00:00

Link: CVE-2023-40217

cve-icon Vulnrichment

Updated: 2024-08-02T18:24:55.789Z

cve-icon NVD

Status : Modified

Published: 2023-08-25T01:15:09.017

Modified: 2023-11-07T04:20:09.013

Link: CVE-2023-40217

cve-icon Redhat

Severity : Important

Publid Date: 2023-08-25T00:00:00Z

Links: CVE-2023-40217 - Bugzilla