PT-2021-11909 · Engine.Io · Engine.Io

Bcaller · Published 2021-01-07 · Updated 2022-02-09 · CVE-2020-36048

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Engine.IO versions prior to 4.0.0

Description: The issue allows attackers to cause a denial of service via a POST request to the long polling transport, resulting in resource consumption. This can be achieved by sending a POST request to the "/longpolling" endpoint, although the exact endpoint is not explicitly mentioned in the provided descriptions.

Recommendations: For versions prior to 4.0.0, update to version 4.0.0 or later to resolve the issue. As a temporary workaround, consider restricting access to the long polling transport to minimize the risk of exploitation.

Exploit

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

AZL-44673

CVE-2020-36048

GHSA-J4F2-536G-R55M

Affected Products

Engine.Io

References · 11

• 🔥 https://blog.caller.xyz/socketio-engineio-dos · Exploit
• https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b · Patch
• https://osv.dev/vulnerability/CVE-2020-36048 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-36048 · Security Note
• https://osv.dev/vulnerability/AZL-44673 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-j4f2-536g-r55m · Vendor Advisory
• https://github.com/socketio/engine.io · Note
• https://github.com/socketio/engine.io/commit/58e274c437e9cbcf69fd913c813aad8fbd253703 · Note
• https://github.com/bcaller/kill-engine-io · Note
• https://t.me/cibsecurity/21800 · Telegram Post
• https://t.me/cvenotify/8308 · Telegram Post