Arch Linux Security Advisory ASA-202102-19

Severity: Low
Date : 2021-02-07
CVE-ID : CVE-2020-28493
Package : python-jinja
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-1523

Summary

The package python-jinja before version 2.11.3-1 is vulnerable to
denial of service.

Resolution

Upgrade to 2.11.3-1.

pacman -Syu “python-jinja>=2.11.3-1”

The problem has been fixed upstream in version 2.11.3.

Workaround

None.

Description

A security issue was found in python-jinja before version 2.11.3. The
regular expression denial of service vulnerability is mainly due to the
sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ 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.

Impact

A remote user might cause a huge CPU utilization via specially crafted
input.

References

https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994
https://github.com/pallets/jinja/pull/1343
https://github.com/pallets/jinja/commit/ef658dc3b6389b091d608e710a810ce8b87995b3
https://security.archlinux.org/CVE-2020-28493