PT-2021-20529 · Eclipse · Eclipse Theia

Paul Maréchal · Published 2021-09-01 · Updated 2022-10-27 · CVE-2021-34435

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Eclipse Theia versions 0.3.9 through 1.8.1

Description: The issue allows a previewed HTML file to trigger a remote code execution (RCE) in the Eclipse Theia IDE, specifically through the "mini-browser" extension. This exploit occurs when a user previews a malicious HTML file within the IDE's iframe.

Recommendations: For Eclipse Theia versions 0.3.9 through 1.8.1, consider disabling the "mini-browser" extension as a temporary workaround to prevent the exploitation of this issue until a patch is available. Restrict access to previewing HTML files within the IDE to minimize the risk of RCE.

Exploit

Fix

Exposure of Resource to Wrong Sphere

Origin Validation Error

Weakness Enumeration

CWE-942

CWE-668

CWE-346

Related Identifiers

CVE-2021-34435

GHSA-V9W2-V7J9-RJPR

Affected Products

Eclipse Theia

References · 8

• 🔥 https://bugs.eclipse.org/bugs/show_bug.cgi?id=568018 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-34435 · Security Note
• https://osv.dev/vulnerability/GHSA-v9w2-v7j9-rjpr · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-34435 · Vendor Advisory
• https://github.com/eclipse-theia/theia/pull/8759 · Note
• https://github.com/eclipse-theia/theia/commit/0761dcf5fe3c14c27432683d42d2c526ad0cfbd5 · Note
• https://github.com/eclipse-theia/theia · Note
• https://t.me/cvenotify/20525 · Telegram Post