Attacker Value
Moderate
(1 user assessed)
Exploitability
Moderate
(1 user assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
0

CVE-2018-12122

Disclosure Date: November 28, 2018
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0: Slowloris HTTP Denial of Service: An attacker can cause a Denial of Service (DoS) by sending headers very slowly keeping HTTP or HTTPS connections and associated resources alive for a long period of time.

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2
Ratings
  • Attacker Value
    Medium
  • Exploitability
    Medium
Technical Analysis

This is a Denial of Service CVE, but with a twist. Normally, denial of service attacks consist of flooding a server with enough traffic so that it ceases to operate. This CVE is different, as it is a Slowloris DoS. Slowloris DoS attacks hang a server by opening as many threads as possible before waiting the max amount of time that they can before sending data. When they finally send data, they send as small of an amount of data as the server will allow. This keeps all the threads open for as long as possible, meaning no new connections can be opened, thus causing a denial of service. For a more detailed explanation of a Slowloris attack, please see the following video: https://www.youtube.com/watch?v=XiFkyR35v2Y .

This particular CVE affects all versions of Node.JS prior to 6.15.0, 8.14.0, 10.14.0 and 11.3.0. Node patched this by applying a 40 second timeout to servers receiving HTTP headers, and can be customized. As a patch has been released, please patch accordingly.

CVSS V3 Severity and Metrics
Base Score:
7.5 High
Impact Score:
3.6
Exploitability Score:
3.9
Vector:
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High

General Information

Vendors

  • The Node.js Project

Products

  • Node.js

Additional Info

Technical Analysis