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RedHat: RHSA-2021-4151 Moderate: Python 2.7 DoS And Other Threats

red hat
Calendar Grey November 9, 2021
Dist Redhat Esm H88
Python 2.7 package enhancement released in Red Hat addressing moderate security concerns. Resolves DoS threats and additional vulnerabilities.
An update for the python27:2.7 module is now available for Red Hat Enterprise Linux 8

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Summary

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.
Security Fix(es):
* python: Unsafe use of eval() on data retrieved via HTTP in the test suite (CVE-2020-27619)
* python-jinja2: ReDoS vulnerability in the urlize filter (CVE-2020-28493)
* python-babel: Relative path traversal allows attacker to load arbitrary locale files and execute arbitrary code (CVE-2021-20095, CVE-2021-42771)
* python-pygments: Infinite loop in SML lexer may lead to DoS (CVE-2021-20270)
* python: Web cache poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a semicolon in query parameters(CVE-2021-23336)
* python-pygments: ReDoS in multiple lexers (CVE-2021-27291)
* python-lxml: Missing input sanitization for formaction HTML5 attributes may lead to XSS (CVE-2021-28957)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory Red Hat Enterprise Linux DoS threat python update Moderate impact Web cache poisoning Relative path traversal

References

https://access.redhat.com/security/cve/CVE-2020-27619 https://access.redhat.com/security/cve/CVE-2020-28493 https://access.redhat.com/security/cve/CVE-2021-20095 https://access.redhat.com/security/cve/CVE-2021-20270 https://access.redhat.com/security/cve/CVE-2021-23336 https://access.redhat.com/security/cve/CVE-2021-27291 https://access.redhat.com/security/cve/CVE-2021-28957 https://access.redhat.com/security/cve/CVE-2021-42771 https://access.redhat.com/security/updates/classification#moderate https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/8.5_release_notes/index

Package List

Red Hat Enterprise Linux AppStream (v. 8):
Source: Cython-0.28.1-7.module+el8.1.0+3111+de3f2d8e.src.rpm PyYAML-3.12-16.module+el8.1.0+3111+de3f2d8e.src.rpm babel-2.5.1-10.module+el8.5.0+11014+88fc0d0b.src.rpm numpy-1.14.2-16.module+el8.4.0+9406+221a4565.src.rpm pytest-3.4.2-13.module+el8.1.0+3111+de3f2d8e.src.rpm python-PyMySQL-0.8.0-10.module+el8.1.0+3111+de3f2d8e.src.rpm python-attrs-17.4.0-10.module+el8.1.0+3111+de3f2d8e.src.rpm python-backports-1.0-16.module+el8.4.0+9193+f3daf6ef.src.rpm python-backports-ssl_match_hostname-3.5.0.1-12.module+el8.4.0+9193+f3daf6ef.src.rpm python-chardet-3.0.4-10.module+el8.1.0+3111+de3f2d8e.src.rpm python-coverage-4.5.1-4.module+el8.1.0+3111+de3f2d8e.src.rpm python-dns-1.15.0-10.module+el8.1.0+3111+de3f2d8e.src.rpm python-docs-2.7.16-2.module+el8.1.0+3111+de3f2d8e.src.rpm python-docutils-0.14-12.module+el8.1.0+3111+de3f2d8e.src.rpm python-funcsigs-1.0.2-13.module+el8.1.0+3111+de3f2d8e.src.rpm python-idna-2.5-7.module+el8.1.0+3111+de3f2d8e.src.rpm python-ipaddress-1.0.18-6.module+el8.1.0+3111+de3f2d8e.src.rpm python-jinja2-2.10-9.module+el8.5.0+10541+706bb066.src.rpm python-lxml-4.2.3-5.module+el8.5.0+10534+22332931.src.rpm python-markupsafe-0.23-19.module+el8.1.0+3111+de3f2d8e.src.rpm

Read the Full Advisory


Advisory ID: RHSA-2021:4151-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4151
Issue date: 2021-11-09

Topic

An update for the python27:2.7 module is now available for Red HatEnterprise Linux 8.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat Enterprise Linux DoS threat python update Moderate impact Web cache poisoning Relative path traversal

Relevant Releases Architectures

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, noarch, ppc64le, s390x, x86_64

Bugs Fixed

1889886 - CVE-2020-27619 python: Unsafe use of eval() on data retrieved via HTTP in the test suite

1922136 - CVE-2021-20270 python-pygments: Infinite loop in SML lexer may lead to DoS

1928707 - CVE-2020-28493 python-jinja2: ReDoS vulnerability in the urlize filter

1928904 - CVE-2021-23336 python: Web cache poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a semicolon in query parameters1940603 - CVE-2021-27291 python-pygments: ReDoS in multiple lexers1941534 - CVE-2021-28957 python-lxml: Missing input sanitization for formaction HTML5 attributes may lead to XSS

1945483 - python27:2.7: RFE: virtualenv to prefer wheels from /usr/share/pythonXY-wheels when creating environment for Python X.Y

1955615 - CVE-2021-20095 CVE-2021-42771 python-babel: Relative path traversal allows attacker to load arbitrary locale files and execute arbitrary code

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