CVE-2020-28493

 

Published at: - 01-02-2021 09:15

Last modified: - 08-04-2022 04:05

Total changes: - 9

Description

This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDoS vulnerability is mainly due to the `_punctuation_re regex` operator and its use of multiple wildcards. The last wildcard is the most exploitable as it searches for trailing punctuation. This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

 

Verification logic

 

Reference

• https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20
• https://github.com/pallets/jinja/pull/1343
• https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994
• FEDORA-2021-2ab8ebcabc-Mailing List, Third Party Advisory
• GLSA-202107-19-Third Party Advisory

 

Keywords

NVD

 

CVE-2020-28493

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures