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Oracle Linux: CVE-2021-27291: ELSA-2021-4151: python27:2.7 security update (MODERATE) (Multiple Advisories)

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Oracle Linux: CVE-2021-27291: ELSA-2021-4151: python27:2.7 security update (MODERATE) (Multiple Advisories)

Severity
8
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:C)
Published
01/11/2021
Created
11/23/2021
Added
11/19/2021
Modified
01/07/2025

Description

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. A denial of service attack was discovered against pygments. Some of the regular expressions used to tokenise source code for highlighting have exponential complexity. A specially crafted input file could cause pygments to take effectively infinite time to parse, consuming CPU resources and denying access to the service.

Solution(s)

  • oracle-linux-upgrade-python36
  • oracle-linux-upgrade-python36-debug
  • oracle-linux-upgrade-python36-devel
  • oracle-linux-upgrade-python36-rpm-macros
  • oracle-linux-upgrade-python3-bson
  • oracle-linux-upgrade-python3-distro
  • oracle-linux-upgrade-python3-docs
  • oracle-linux-upgrade-python3-docutils
  • oracle-linux-upgrade-python3-nose
  • oracle-linux-upgrade-python3-pygments
  • oracle-linux-upgrade-python3-pymongo
  • oracle-linux-upgrade-python3-pymongo-gridfs
  • oracle-linux-upgrade-python3-pymysql
  • oracle-linux-upgrade-python3-scipy
  • oracle-linux-upgrade-python3-sqlalchemy
  • oracle-linux-upgrade-python3-virtualenv
  • oracle-linux-upgrade-python3-wheel
  • oracle-linux-upgrade-python3-wheel-wheel
  • oracle-linux-upgrade-python-nose-docs
  • oracle-linux-upgrade-python-pymongo-doc
  • oracle-linux-upgrade-python-sqlalchemy-doc
  • oracle-linux-upgrade-python-virtualenv-doc
  • oracle-linux-upgrade-resource-agents

References

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