high
8.6
CWE
362
Advisory Published
Advisory Published
Updated

CVE-2023-40217: Race Condition

First published: Fri Aug 25 2023(Updated: )

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.)

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Python Python<3.8.18
Python Python>=3.9.0<3.9.18
Python Python>=3.10.0<3.10.13
Python Python>=3.11.0<3.11.5
F5 BIG-IP>=17.1.0<=17.1.1
F5 BIG-IP>=16.1.0<=16.1.4
F5 BIG-IP>=15.1.0<=15.1.10
F5 Traffix SDC=5.1.0
5.2.0
redhat/Python<3.11.5
3.11.5
redhat/Python<3.10.13
3.10.13
redhat/Python<3.9.18
3.9.18
redhat/Python<3.8.18
3.8.18
debian/pypy3<=7.3.5+dfsg-2+deb11u2
7.3.5+dfsg-2+deb11u4
7.3.11+dfsg-2+deb12u2
7.3.17+dfsg-3
debian/python2.7
2.7.18-8+deb11u1
debian/python3.11
3.11.2-6+deb12u4
3.11.2-6+deb12u3
debian/python3.12
3.12.8-3
debian/python3.9<=3.9.2-1
3.9.2-1+deb11u2
IBM Cognos Analytics<=12.0.0-12.0.3
IBM Cognos Analytics<=11.2.0-11.2.4 FP4

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-40217?

    CVE-2023-40217 is a vulnerability discovered in Python versions 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.

  • Who is affected by CVE-2023-40217?

    Servers (such as HTTP servers) that use TLS client authentication are primarily affected by CVE-2023-40217.

  • What is the severity of CVE-2023-40217?

    CVE-2023-40217 has a severity level of 5.3 (medium).

  • How can I fix CVE-2023-40217?

    To fix CVE-2023-40217, it is recommended to update Python to versions 3.8.18, 3.9.18, 3.10.13, or 3.11.5.

  • Where can I find more information about CVE-2023-40217?

    You can find more information about CVE-2023-40217 on the following references: [Link 1](https://lists.debian.org/debian-lts-announce/2023/09/msg00022.html), [Link 2](https://mail.python.org/archives/list/security-announce@python.org/thread/PEPLII27KYHLF4AK3ZQGKYNCRERG4YXY/), [Link 3](https://www.python.org/dev/security/).

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