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Omniauth allows POST parameters to be stored in session

High severity GitHub Reviewed Published Jan 29, 2018 to the GitHub Advisory Database • Updated Aug 28, 2023

Package

bundler omniauth (RubyGems)

Affected versions

< 1.3.2

Patched versions

1.3.2

Description

In strategy.rb in OmniAuth before 1.3.2, the authenticity_token value is improperly protected because POST (in addition to GET) parameters are stored in the session and become available in the environment of the callback phase.

References

Published to the GitHub Advisory Database Jan 29, 2018
Reviewed Jun 16, 2020
Last updated Aug 28, 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
High
Integrity
None
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:H/I:N/A:N

EPSS score

0.185%
(56th percentile)

Weaknesses

No CWEs

CVE ID

CVE-2017-18076

GHSA ID

GHSA-9pr6-grf4-x2fr

Source code

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