PT-2021-12005 · Vaadin · Com.Vaadin:Flow-Server

Published 2021-04-19 · Updated 2021-05-05 · CVE-2020-36321

Positive Technologies (AI Summary)

CVSS v3.1

5.9

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: com.vaadin:flow-server versions 2.0.0 through 2.4.1 com.vaadin:flow-server versions 3.0 prior to 5.0

Description: The issue is related to improper URL validation in the development mode handler, allowing an attacker to request arbitrary files stored outside of the intended frontend resources folder.

Recommendations: For com.vaadin:flow-server versions 2.0.0 through 2.4.1, update to version 2.4.2 or later to resolve the issue. For com.vaadin:flow-server versions 3.0 prior to 5.0, update to version 5.0 or later to resolve the issue. As a temporary workaround, consider disabling the development mode handler until a patch is available.

Fix

RCE

Path traversal

Weakness Enumeration

CWE-20

CWE-22

Related Identifiers

CVE-2020-36321

GHSA-49R2-73M6-PP8F

GHSA-82MF-MMH7-HXP5

Affected Products

Com.Vaadin:Flow-Server

References · 9

• https://github.com/vaadin/flow/pull/9392 · Patch
• https://osv.dev/vulnerability/GHSA-82mf-mmh7-hxp5 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-49r2-73m6-pp8f · Vendor Advisory
• https://vaadin.com/security/cve-2020-36321 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-36321 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-36321 · Security Note
• https://github.com/vaadin/flow/security/advisories/GHSA-49r2-73m6-pp8f · Note
• https://github.com/vaadin/platform · Note
• https://github.com/vaadin/platform/security/advisories/GHSA-82mf-mmh7-hxp5 · Note