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XML External Entity (XXE) vulnerability in bw-calendar-engine

Critical severity GitHub Reviewed Published Dec 20, 2018 to the GitHub Advisory Database • Updated Jan 9, 2023

Package

maven org.bedework.caleng:bw-calendar-engine (Maven)

Affected versions

<= 3.12.2

Patched versions

None

Description

bw-calendar-engine version <= bw-calendar-engine-3.12.0 contains a XML External Entity (XXE) vulnerability in IscheduleClient XML Parser that can result in Disclosure of confidential data, denial of service, SSRF, port scanning. This attack appear to be exploitable via Man in the Middle or malicious server.

References

Published to the GitHub Advisory Database Dec 20, 2018
Reviewed Jun 16, 2020
Last updated Jan 9, 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
High
Privileges required
None
User interaction
None
Scope
Changed
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:H/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS score

0.159%
(53rd percentile)

Weaknesses

CVE ID

CVE-2018-1000836

GHSA ID

GHSA-xmvg-w4f9-99r7

Source code

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