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Rack vulnerable to Denial of Service

High severity GitHub Reviewed Published Nov 15, 2018 to the GitHub Advisory Database • Updated Nov 4, 2023

Package

bundler rack (RubyGems)

Affected versions

>= 2.0.4, < 2.0.6

Patched versions

2.0.6

Description

There is a possible DoS vulnerability in the multipart parser in Rack before 2.0.6. Specially crafted requests can cause the multipart parser to enter a pathological state, causing the parser to use CPU resources disproportionate to the request size.

References

Published by the National Vulnerability Database Nov 13, 2018
Published to the GitHub Advisory Database Nov 15, 2018
Reviewed Jun 16, 2020
Last updated Nov 4, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.081%
(36th percentile)

Weaknesses

CVE ID

CVE-2018-16470

GHSA ID

GHSA-hg78-4f6x-99wq

Source code

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