RHSA-2021:3254MediumCVSS 9.1

Red Hat Security Advisory: rh-python38 security, bug fix, and enhancement update

Published
August 24, 2021
Last Modified
October 14, 2026

🔗 CVE IDs covered (17)

CVE-2020-25659 →CVE-2020-28493 →CVE-2021-4189 →CVE-2020-27619 →CVE-2021-20095 →CVE-2020-27783 →CVE-2021-3426 →CVE-2021-3733 →CVE-2021-23336 →CVE-2021-33503 →CVE-2020-36242 →CVE-2021-3177 →CVE-2021-3572 →CVE-2021-28957 →CVE-2021-29921 →CVE-2021-42771 →CVE-2022-0391 →

📋 Description

CVE-2020-25659 — python-cryptography: Bleichenbacher timing oracle attack against RSA decryption CVE-2020-27619 — python: Unsafe use of eval() on data retrieved via HTTP in the test suite CVE-2020-27783 — python-lxml: mXSS due to the use of improper parser CVE-2020-28493 — python-jinja2: ReDoS vulnerability in the urlize filter CVE-2020-36242 — python-cryptography: Large inputs for symmetric encryption can trigger integer overflow leading to buffer overflow CVE-2021-3177 — python: Stack-based buffer overflow in PyCArg_repr in _ctypes/callproc.c CVE-2021-3426 — python: Information disclosure via pydoc CVE-2021-3572 — python-pip: Incorrect handling of unicode separators in git references CVE-2021-3733 — python: urllib: Regular expression DoS in AbstractBasicAuthHandler CVE-2021-4189 — python: ftplib should not use the host from the PASV response CVE-2021-20095 — python-babel: Relative path traversal allows attacker to load arbitrary locale files and execute arbitrary code CVE-2021-23336 — python: Web cache poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a semicolon in query parameters CVE-2021-28957 — python-lxml: Missing input sanitization for formaction HTML5 attributes may lead to XSS CVE-2021-29921 — python-ipaddress: Improper input validation of octal strings CVE-2021-33503 — python-urllib3: ReDoS in the parsing of authority part of URL CVE-2021-42771 — python-babel: Relative path traversal allows attacker to load arbitrary locale files and execute arbitrary code CVE-2022-0391 — python: urllib.parse does not sanitize URLs containing ASCII newline and tabs

🎯 Affected products129

  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-python38-babel-0:2.7.0-12.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-python38-babel-0:2.7.0-12.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-python38-babel-0:2.7.0-12.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-python38-python-0:3.8.11-2.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-python38-python-0:3.8.11-2.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-python38-python-0:3.8.11-2.el7.s390x as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-python38-python-0:3.8.11-2.el7.s390x as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-python38-python-0:3.8.11-2.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-python38-python-0:3.8.11-2.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-python38-python-0:3.8.11-2.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-python38-python-0:3.8.11-2.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-python38-python-0:3.8.11-2.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-python38-python-0:3.8.11-2.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-python38-python-babel-0:2.7.0-12.el7.noarch as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-python38-python-babel-0:2.7.0-12.el7.noarch as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-python38-python-babel-0:2.7.0-12.el7.noarch as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-python38-python-cryptography-0:2.8-5.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-python38-python-cryptography-0:2.8-5.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-python38-python-cryptography-0:2.8-5.el7.s390x as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-python38-python-cryptography-0:2.8-5.el7.s390x as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-python38-python-cryptography-0:2.8-5.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-python38-python-cryptography-0:2.8-5.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-python38-python-cryptography-0:2.8-5.el7.src as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-python38-python-cryptography-0:2.8-5.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • rh-python38-python-cryptography-0:2.8-5.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)
  • rh-python38-python-cryptography-0:2.8-5.el7.x86_64 as a component of Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)
  • rh-python38-python-cryptography-debuginfo-0:2.8-5.el7.ppc64le as a component of Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)
  • +99 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: In versions of Python shipped with Red Hat Enterprise Linux and Red Hat Software Collections, the flaw can be mitigated by not running the python tests with network resources enabled. By default, the tests are not run with network resources enabled. Ensure that `-u network` or `-uall` are not passed as options to `python -m test`. For more information on how these commands work, see [1]. 1. https://docs.python.org/3/library/test.html Workaround: If using the jinja2 library as a developer, this flaw can be mitigated by not using the vulnerable urlize() filter, and instead, using Markdown to format user content. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: Use the console (no argument needed) or HTML file (-w argument) output to generate docs rather than the HTTP server options. Put differently, do not use the -p or -n options of pydoc. Workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

🔗 References (19)