Cross-site Scripting (XSS) Affecting python27:2.7/python2-pyyaml package, versions <0:3.12-16.module_el8.6.0+2781+fed64c13


Severity

Recommended
0.0
medium
0
10

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.16% (54th percentile)

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  • Snyk IDSNYK-ALMALINUX8-PYTHON27-5635748
  • published28 May 2023
  • disclosed9 Nov 2021

Introduced: 9 Nov 2021

CVE-2021-28957  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 python27:2.7/python2-pyyaml to version 0:3.12-16.module_el8.6.0+2781+fed64c13 or higher.
This issue was patched in ALSA-2021:4151.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python27:2.7/python2-pyyaml package and not the python27:2.7/python2-pyyaml package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1