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CVE-2020-28493

Regular Expression Denial of Service (ReDoS)

Published: Feb 1, 2021Updated: Nov 21, 2024 Sources: CVE List NVD GHSA BDUCWE-400
5.3MEDIUM
NVD MITRE
EPSS Score
3.5%
Top 12.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-400

Affected Products

palletsprojects
oss-project·US
jinjaLibrary
OSS Libraries / pypi
fedoraproject
oss-project·USaka fedora project
fedoraOn-premOS
Operating Systems / linux-distro
PyPI
package-ecosystem
Jinja2
OSS Libraries
ООО «РусБИТех-Астра»
commercial·RUaka rusbitech-astra
Astra Linux Special EditionOn-premOS
Operating Systems / linux-distro
Fedora Project
oss-project·USaka fedora
FedoraOn-premOS
Operating Systems / linux-distro
IBM Corp.
commercial·USaka ibm, ibm corporation
IBM Qradar AdvisorOn-premWeb App
Security Products / vuln-mgmt-scanner
and 3 more affected products View all →

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994
snyk.io
https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20
github.com
https://github.com/pallets/jinja/pull/1343
github.com
and 17 more references View all →
News mentions
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