Detections
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Oracle Linux 8 : python27:2.7 (ELSA-2021-4151)

high Nessus Plugin ID 155987

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Synopsis

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

Description

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-4151 advisory.

 - In Python 3 through 3.9.0, the Lib/test/multibytecodec_support.py CJK codec tests call eval() on content retrieved via HTTP. (CVE-2020-27619)

 - The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter. (CVE-2021-23336)

 - Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution. (CVE-2021-42771)

 - An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the exception keyword. (CVE-2021-20270)

 - In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.
 (CVE-2021-27291)

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://linux.oracle.com/errata/ELSA-2021-4151.html

Plugin Details

Severity: High

ID: 155987

File Name: oraclelinux_ELSA-2021-4151.nasl

Version: 1.9

Type: local

Agent: unix

Published: 12/10/2021

Updated: 9/23/2025

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2020-27619

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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:P/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 7.4

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2021-42771

Vulnerability Information

CPE: p-cpe:/a:oracle:linux:python2-wheel-wheel, p-cpe:/a:oracle:linux:python2-docs-info, p-cpe:/a:oracle:linux:python2-docutils, p-cpe:/a:oracle:linux:python2-setuptools-wheel, p-cpe:/a:oracle:linux:python2-psycopg2-debug, p-cpe:/a:oracle:linux:python2-test, p-cpe:/a:oracle:linux:python2-libs, p-cpe:/a:oracle:linux:python2-chardet, p-cpe:/a:oracle:linux:python2-setuptools, p-cpe:/a:oracle:linux:python2-sqlalchemy, p-cpe:/a:oracle:linux:python2-pysocks, p-cpe:/a:oracle:linux:python-psycopg2-doc, p-cpe:/a:oracle:linux:python2-devel, p-cpe:/a:oracle:linux:python2-pytest, p-cpe:/a:oracle:linux:python2-requests, p-cpe:/a:oracle:linux:python2-urllib3, p-cpe:/a:oracle:linux:python2-docs, p-cpe:/a:oracle:linux:python2-funcsigs, p-cpe:/a:oracle:linux:python2-debug, p-cpe:/a:oracle:linux:python2-py, p-cpe:/a:oracle:linux:python2-coverage, p-cpe:/a:oracle:linux:python2-pygments, p-cpe:/a:oracle:linux:python2-numpy-f2py, p-cpe:/a:oracle:linux:python-nose-docs, p-cpe:/a:oracle:linux:python2-nose, p-cpe:/a:oracle:linux:python2-numpy-doc, p-cpe:/a:oracle:linux:python2-pytest-mock, p-cpe:/a:oracle:linux:python2-pip-wheel, p-cpe:/a:oracle:linux:python2-backports-ssl_match_hostname, p-cpe:/a:oracle:linux:python2-numpy, p-cpe:/a:oracle:linux:python2-ipaddress, p-cpe:/a:oracle:linux:python2-mock, p-cpe:/a:oracle:linux:babel, p-cpe:/a:oracle:linux:python2-virtualenv, p-cpe:/a:oracle:linux:python2-six, p-cpe:/a:oracle:linux:python2-pluggy, p-cpe:/a:oracle:linux:python2-jinja2, p-cpe:/a:oracle:linux:python2-tkinter, p-cpe:/a:oracle:linux:python2-pymysql, cpe:/o:oracle:linux:8, p-cpe:/a:oracle:linux:python2-lxml, p-cpe:/a:oracle:linux:python2-pytz, p-cpe:/a:oracle:linux:python2-setuptools_scm, p-cpe:/a:oracle:linux:python2-babel, p-cpe:/a:oracle:linux:python2-scipy, p-cpe:/a:oracle:linux:python2-backports, p-cpe:/a:oracle:linux:python2-psycopg2, p-cpe:/a:oracle:linux:python2-tools, p-cpe:/a:oracle:linux:python2-wheel, p-cpe:/a:oracle:linux:python2-pymongo-gridfs, p-cpe:/a:oracle:linux:python2-pymongo, p-cpe:/a:oracle:linux:python2-rpm-macros, p-cpe:/a:oracle:linux:python2-dns, p-cpe:/a:oracle:linux:python-sqlalchemy-doc, p-cpe:/a:oracle:linux:python2-pip, p-cpe:/a:oracle:linux:python2-idna, p-cpe:/a:oracle:linux:python2-attrs, p-cpe:/a:oracle:linux:python2-markupsafe, p-cpe:/a:oracle:linux:python2-pyyaml, p-cpe:/a:oracle:linux:python2, p-cpe:/a:oracle:linux:python2-bson, p-cpe:/a:oracle:linux:python2-psycopg2-tests, p-cpe:/a:oracle:linux:python2-cython

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: 10/22/2020

Reference Information

CVE: CVE-2020-27619, CVE-2020-28493, CVE-2021-20270, CVE-2021-23336, CVE-2021-27291, CVE-2021-28957, CVE-2021-42771

IAVA: 2021-A-0052-S, 2021-A-0263-S