Python TLS Handshake Bypass (CVE-2023-40217)

medium Nessus Plugin ID 180273

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Synopsis

The remote host has an application installed that is affected by a vulnerability.

Description

The version of Python installed on the remote Windows host is potentially affected by a vulnerability that 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.)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Python 3.11.5, 3.10.13, 3.9.18, 3.8.18 or later, apply a patch, or see workarounds.

Plugin Details

Severity: Medium

ID: 180273

File Name: python_3_12_0rc2.nasl

Version: 1.4

Type: local

Agent: windows

Family: Windows

Published: 8/30/2023

Updated: 11/15/2024

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2023-40217

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:python:python

Required KB Items: SMB/Registry/Enumerated, installed_sw/Python Software Foundation Python

Exploit Ease: No known exploits are available

Patch Publication Date: 8/24/2023

Vulnerability Publication Date: 8/24/2023

Reference Information

CVE: CVE-2023-40217

IAVA: 2023-A-0442-S

Detections

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