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HTTP Smuggling via Transfer-Encoding Header in Puma

High severity GitHub Reviewed Published May 21, 2020 in puma/puma • Updated May 16, 2023

Package

bundler puma (RubyGems)

Affected versions

< 3.12.5
>= 4.0.0, < 4.3.4

Patched versions

3.12.5
4.3.4

Description

Impact

By using an invalid transfer-encoding header, an attacker could smuggle an HTTP response.

Originally reported by @ZeddYu, who has our thanks for the detailed report.

Patches

The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.

For more information

If you have any questions or comments about this advisory:

References

@nateberkopec nateberkopec published to puma/puma May 21, 2020
Reviewed May 22, 2020
Published to the GitHub Advisory Database May 22, 2020
Published by the National Vulnerability Database May 22, 2020
Last updated May 16, 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
High
Availability
None

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

EPSS score

0.379%
(73rd percentile)

Weaknesses

CVE ID

CVE-2020-11076

GHSA ID

GHSA-x7jg-6pwg-fx5h

Source code

Credits

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