Oracle Linux 8 : python39:3.9 / and / python39-devel:3.9 (ELSA-2021-4160)

critical Nessus Plugin ID 155967


The remote Oracle Linux host is missing one or more security updates.


The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-4160 advisory.

- python: urllib: Regular expression DoS in AbstractBasicAuthHandler (CVE-2021-3733)

- A flaw was found in python-pip in the way it handled Unicode separators in git references. A remote attacker could possibly use this issue to install a different revision on a repository. The highest threat from this vulnerability is to data integrity. This is fixed in python-pip version 21.1. (CVE-2021-3572)

- There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9, Python versions before 3.9.3 and Python versions before 3.10.0a7. (CVE-2021-3426)

- An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.

- An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.

- python: urllib: HTTP client possible infinite loop on a 100 Continue response (CVE-2021-3737)

- In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string. This (in some situations) allows attackers to bypass access control that is based on IP addresses. (CVE-2021-29921)

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


Update the affected packages.

See Also

Plugin Details

Severity: Critical

ID: 155967

File Name: oraclelinux_ELSA-2021-4160.nasl

Version: 1.5

Type: local

Agent: unix

Published: 12/10/2021

Updated: 11/22/2023

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information


Risk Factor: Medium

Score: 6.7


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.2

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

CVSS Score Source: CVE-2021-29921


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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

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

Vulnerability Information

CPE: p-cpe:/a:oracle:linux:python39-test, p-cpe:/a:oracle:linux:python39-tkinter, p-cpe:/a:oracle:linux:python39-toml, p-cpe:/a:oracle:linux:python39-urllib3, p-cpe:/a:oracle:linux:python39-wcwidth, p-cpe:/a:oracle:linux:python39-wheel, p-cpe:/a:oracle:linux:python39-wheel-wheel, cpe:/o:oracle:linux:8, p-cpe:/a:oracle:linux:python39, p-cpe:/a:oracle:linux:python39-cython, p-cpe:/a:oracle:linux:python39-pymysql, p-cpe:/a:oracle:linux:python39-attrs, p-cpe:/a:oracle:linux:python39-cffi, p-cpe:/a:oracle:linux:python39-chardet, p-cpe:/a:oracle:linux:python39-cryptography, p-cpe:/a:oracle:linux:python39-debug, p-cpe:/a:oracle:linux:python39-devel, p-cpe:/a:oracle:linux:python39-idle, p-cpe:/a:oracle:linux:python39-idna, p-cpe:/a:oracle:linux:python39-iniconfig, p-cpe:/a:oracle:linux:python39-libs, p-cpe:/a:oracle:linux:python39-lxml, p-cpe:/a:oracle:linux:python39-mod_wsgi, p-cpe:/a:oracle:linux:python39-more-itertools, p-cpe:/a:oracle:linux:python39-numpy, p-cpe:/a:oracle:linux:python39-numpy-doc, p-cpe:/a:oracle:linux:python39-numpy-f2py, p-cpe:/a:oracle:linux:python39-packaging, p-cpe:/a:oracle:linux:python39-pip, p-cpe:/a:oracle:linux:python39-pip-wheel, p-cpe:/a:oracle:linux:python39-pluggy, p-cpe:/a:oracle:linux:python39-ply, p-cpe:/a:oracle:linux:python39-psutil, p-cpe:/a:oracle:linux:python39-psycopg2, p-cpe:/a:oracle:linux:python39-psycopg2-doc, p-cpe:/a:oracle:linux:python39-psycopg2-tests, p-cpe:/a:oracle:linux:python39-py, p-cpe:/a:oracle:linux:python39-pybind11, p-cpe:/a:oracle:linux:python39-pybind11-devel, p-cpe:/a:oracle:linux:python39-pycparser, p-cpe:/a:oracle:linux:python39-pyparsing, p-cpe:/a:oracle:linux:python39-pysocks, p-cpe:/a:oracle:linux:python39-pytest, p-cpe:/a:oracle:linux:python39-pyyaml, p-cpe:/a:oracle:linux:python39-requests, p-cpe:/a:oracle:linux:python39-rpm-macros, p-cpe:/a:oracle:linux:python39-scipy, p-cpe:/a:oracle:linux:python39-setuptools, p-cpe:/a:oracle:linux:python39-setuptools-wheel, p-cpe:/a:oracle:linux:python39-six

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/OracleLinux

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/16/2021

Vulnerability Publication Date: 3/21/2021

Reference Information

CVE: CVE-2021-28957, CVE-2021-29921, CVE-2021-33503, CVE-2021-3426, CVE-2021-3572, CVE-2021-3733, CVE-2021-3737

IAVA: 2021-A-0263-S, 2021-A-0497-S