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cve[email protected]CVE-2023-40217
HistoryAug 25, 2023 - 1:15 a.m.

CVE-2023-40217

2023-08-2501:15:09
web.nvd.nist.gov
517
cve-2023-40217
python
tls
buffer data
security vulnerability
nvd

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

5.8 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

18.4%

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.)

Affected configurations

NVD
Node
pythonpythonRange<3.8.18
OR
pythonpythonRange3.9.03.9.18
OR
pythonpythonRange3.10.03.10.13
OR
pythonpythonRange3.11.03.11.5

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

5.8 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

18.4%