medium
6.5
CWE
754
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2023-23931: Cipher.update_into can corrupt memory in pyca cryptography

First published: Tue Feb 07 2023(Updated: )

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.

Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
pip/cryptography>=1.8<39.0.1
39.0.1
Cryptography Project Cryptography>=1.8<39.0.1
debian/python-cryptography<=2.6.1-3+deb10u2<=3.3.2-1<=38.0.4-3~deb12u1
2.6.1-3+deb10u4
38.0.4-3
41.0.7-4
42.0.5-2
ubuntu/python-cryptography<2.8-3ubuntu0.2
2.8-3ubuntu0.2
ubuntu/python-cryptography<3.4.8-1ubuntu2.1
3.4.8-1ubuntu2.1
ubuntu/python-cryptography<38.0.4-2ubuntu0.1
38.0.4-2ubuntu0.1
ubuntu/python-cryptography<39.0.1
39.0.1
redhat/python-cryptography<39.0.1
39.0.1
redhat/cryptography<39.0.1
39.0.1
Cryptography.io Cryptography Python>=1.8<39.0.1
>=1.8<39.0.1

Remedy

https://github.com/pyca/cryptography/pull/8230/commits/94a50a9731f35405f0357fa5f3b177d46a726ab3

Remedy

https://github.com/pyca/cryptography/commit/9fbf84efc861668755ab645530ec7be9cf3c6696

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-23931?

    CVE-2023-23931 is a vulnerability in the cryptography package for Python that allows the use of objects implementing the buffer protocol to update immutable buffers.

  • What is the severity of CVE-2023-23931?

    CVE-2023-23931 has a severity rating of medium with a CVSS score of 6.5.

  • Which software is affected by CVE-2023-23931?

    The cryptography package for Python versions 1.8 up to and including 39.0.1 is affected by CVE-2023-23931.

  • How can I fix CVE-2023-23931?

    To fix CVE-2023-23931, update the cryptography package to version 39.0.1 or higher.

  • Where can I find more information about CVE-2023-23931?

    You can find more information about CVE-2023-23931 in the following references: [GitHub Advisory](https://github.com/pyca/cryptography/security/advisories/GHSA-w7pp-m8wf-vj6r), [GitHub Pull Request](https://github.com/pyca/cryptography/pull/8230/commits/94a50a9731f35405f0357fa5f3b177d46a726ab3), [NVD](https://nvd.nist.gov/vuln/detail/CVE-2023-23931).

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