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Ubuntu 18.04 LTS : Python vulnerabilities (USN-5200-1)

high Nessus Plugin ID 156171

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Synopsis

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

Description

The remote Ubuntu 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5200-1 advisory.

 It was discovered that the urllib.request.AbstractBasicAuthHandler class

 in Python contains regex allowing for catastrophic backtracking. Specially

 crafted traffic from a malicious HTTP server could cause a regular expression

 denial of service (ReDoS) condition for a client. (CVE-2020-8492)

 It was discovered that the urllib.request.AbstractBasicAuthHandler class

 in Python contains regex with a quadratic worst-case time complexity.

 Specially crafted traffic from a malicious HTTP server could cause a regular

 expression denial of service (ReDoS) condition for a client. (CVE-2021-3733)

 It was discovered that the Python urllib http client could enter into an infinite

 loop when incorrectly handling certain server responses (100 Continue response).

 Specially crafted traffic from a malicious HTTP server could cause a denial of

 service (DoS) condition for a client. (CVE-2021-3737)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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 packages.

See Also

https://ubuntu.com/security/notices/USN-5200-1

Plugin Details

Severity: High

ID: 156171

File Name: ubuntu_USN-5200-1.nasl

Version: 1.8

Type: local

Agent: unix

Published: 12/18/2021

Updated: 8/27/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.6

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

CVSS Score Source: CVE-2021-3737

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:libpython3.7-testsuite, p-cpe:/a:canonical:ubuntu_linux:idle-python3.8, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:python3.7-minimal, p-cpe:/a:canonical:ubuntu_linux:idle-python3.7, p-cpe:/a:canonical:ubuntu_linux:libpython3.7-minimal, p-cpe:/a:canonical:ubuntu_linux:libpython3.8-dev, p-cpe:/a:canonical:ubuntu_linux:libpython3.7-stdlib, p-cpe:/a:canonical:ubuntu_linux:libpython3.8-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.7-venv, p-cpe:/a:canonical:ubuntu_linux:python3.7-dev, p-cpe:/a:canonical:ubuntu_linux:libpython3.8, p-cpe:/a:canonical:ubuntu_linux:python3.8-minimal, p-cpe:/a:canonical:ubuntu_linux:python3.8-examples, p-cpe:/a:canonical:ubuntu_linux:libpython3.7-dev, p-cpe:/a:canonical:ubuntu_linux:python3.8, p-cpe:/a:canonical:ubuntu_linux:python3.8-venv, p-cpe:/a:canonical:ubuntu_linux:python3.7-examples, p-cpe:/a:canonical:ubuntu_linux:libpython3.7, p-cpe:/a:canonical:ubuntu_linux:python3.7, p-cpe:/a:canonical:ubuntu_linux:libpython3.8-testsuite, p-cpe:/a:canonical:ubuntu_linux:libpython3.8-stdlib, p-cpe:/a:canonical:ubuntu_linux:python3.8-dev

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 12/17/2021

Vulnerability Publication Date: 1/30/2020

Reference Information

CVE: CVE-2020-8492, CVE-2021-3733, CVE-2021-3737

IAVA: 2020-A-0103-S, 2021-A-0497-S

USN: 5200-1