CVE-2020-28493 — MEDIUM (5.3)

Q: How severe is CVE-2020-28493?

CVE-2020-28493 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2020-28493?

Check the references section above for vendor advisories and patch information. Affected products include: Palletsprojects Jinja, Fedoraproject Fedora.

Vulnerability 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.

CVSS Score

5.3

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

LOW

Affected Products

Vendor	Product	Versions
Palletsprojects	Jinja	< 2.11.3
Fedoraproject	Fedora	33

Related Weaknesses (CWE)

CWE-400

References

https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/sBroken Link
https://github.com/pallets/jinja/pull/1343PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
https://security.gentoo.org/glsa/202107-19Third Party Advisory
https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994ExploitThird Party Advisory
https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/sBroken Link
https://github.com/pallets/jinja/pull/1343PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
https://security.gentoo.org/glsa/202107-19Third Party Advisory
https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994ExploitThird Party Advisory

FAQ

What is CVE-2020-28493?

CVE-2020-28493 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 ...

How severe is CVE-2020-28493?

CVE-2020-28493 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2020-28493?

Check the references section above for vendor advisories and patch information. Affected products include: Palletsprojects Jinja, Fedoraproject Fedora.