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Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 23.10 : python-cryptography vulnerabilities (USN-6673-1)

high Nessus Plugin ID 191499

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 23.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6673-1 advisory.

 - A flaw was found in the python-cryptography package. This issue may allow a remote attacker to decrypt captured messages in TLS servers that use RSA key exchanges, which may lead to exposure of confidential or sensitive data. (CVE-2023-50782)

 - cryptography is a package designed to expose cryptographic primitives and recipes to Python developers.
 Starting in version 38.0.0 and prior to version 42.0.4, if `pkcs12.serialize_key_and_certificates` is called with both a certificate whose public key did not match the provided private key and an `encryption_algorithm` with `hmac_hash` set (via `PrivateFormat.PKCS12.encryption_builder().hmac_hash(...)`, then a NULL pointer dereference would occur, crashing the Python process. This has been resolved in version 42.0.4, the first version in which a `ValueError` is properly raised. (CVE-2024-26130)

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

Solution

Update the affected python-cryptography and / or python3-cryptography packages.

See Also

https://ubuntu.com/security/notices/USN-6673-1

Plugin Details

Severity: High

ID: 191499

File Name: ubuntu_USN-6673-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 3/5/2024

Updated: 3/6/2024

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2023-50782

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:23.10, p-cpe:/a:canonical:ubuntu_linux:python-cryptography, p-cpe:/a:canonical:ubuntu_linux:python3-cryptography

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 3/4/2024

Vulnerability Publication Date: 3/4/2024

Reference Information

CVE: CVE-2023-50782, CVE-2024-26130

USN: 6673-1