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Improper Restriction of XML External Entity Reference in Jelly

Critical severity GitHub Reviewed Published May 17, 2022 to the GitHub Advisory Database • Updated Feb 15, 2023

Package

maven commons-jelly:commons-jelly (Maven)

Affected versions

<= 1.0

Patched versions

1.0.1

Description

During Jelly (xml) file parsing with Apache Xerces, if a custom doctype entity is declared with a "SYSTEM" entity with a URL and that entity is used in the body of the Jelly file, during parser instantiation the parser will attempt to connect to said URL. This could lead to XML External Entity (XXE) attacks in Apache Commons Jelly before 1.0.1.

References

Published by the National Vulnerability Database Sep 28, 2017
Published to the GitHub Advisory Database May 17, 2022
Reviewed Jul 1, 2022
Last updated Feb 15, 2023

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.583%
(79th percentile)

Weaknesses

CVE ID

CVE-2017-12621

GHSA ID

GHSA-6g33-82gc-3pw5

Source code

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