PT-2018-9560 · Bw · Bw-Calendar-Engine

Prodigysml · Published 2018-12-20 · Updated 2019-02-07 · CVE-2018-1000836

Positive Technologies (AI Summary)

CVSS v3.1

9.0

Critical

Base vector

AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions bw-calendar-engine versions prior to 3.12.0

Description The issue concerns a XML External Entity (XXE) vulnerability in the IscheduleClient XML Parser. This can lead to disclosure of confidential data, denial of service, Server-Side Request Forgery (SSRF), and port scanning. The attack is exploitable via a Man in the Middle or a malicious server.

Recommendations For versions prior to 3.12.0, update to version 3.12.0 or later to resolve the issue. As a temporary workaround, consider restricting access to the IscheduleClient XML Parser to minimize the risk of exploitation.

Fix

XXE

Weakness Enumeration

CWE-611

Related Identifiers

CVE-2018-1000836

GHSA-XMVG-W4F9-99R7

Affected Products

Bw-Calendar-Engine

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2018-1000836 · Security Note
• https://osv.dev/vulnerability/GHSA-xmvg-w4f9-99r7 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2018-1000836 · Vendor Advisory
• https://github.com/Bedework/bw-calendar-engine · Note
• https://github.com/Bedework/bw-calendar-engine/issues/3 · Note
• https://github.com/advisories/GHSA-xmvg-w4f9-99r7 · Note
• https://0dd.zone/2018/10/28/bw-calendar-engine-XXE-MitM · Note