CVE-2019-9837

Publication date 21 March 2019

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Doorkeeper::OpenidConnect (aka the OpenID Connect extension for Doorkeeper) 1.4.x and 1.5.x before 1.5.4 has an open redirect via the redirect_uri field in an OAuth authorization request (that results in an error response) with the 'openid' scope and a prompt=none value. This allows phishing attacks against the authorization flow.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ruby-doorkeeper-openid-connect	19.04 disco	Fixed 1.5.5-1
	18.10 cosmic	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Notes

ebarretto

It looks like version < 1.4.x are not affected as they don't redirect to another uri.

Severity score breakdown

Parameter	Value
Base score	6.1 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Changed
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N