Vulnerability identifier: #VU72036

Vulnerability risk: Low

CVSSv3.1: 2 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-23931

CWE-ID: CWE-388

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
python-cryptography
Universal components / Libraries / Programming Languages & Components

Vendor: Python Cryptographic Authority

Description

The vulnerability allows an attacker to misuse Python API.

The vulnerability exists due to a soundness bug within the Cipher.update_into function, which can allow immutable objects (such as bytes) to be mutated. A malicious programmer can misuse Python API to introduce unexpected behavior into the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

python-cryptography: 0.8 - 39.0.0

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External links
http://github.com/pyca/cryptography/security/advisories/GHSA-w7pp-m8wf-vj6r
http://github.com/pyca/cryptography/pull/8230/commits/94a50a9731f35405f0357fa5f3b177d46a726ab3

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.