[ GLSA 202003-09 ] OpenID library for Ruby

[GLSA]

Gentoo Linux Security Advisory

Title: OpenID library for Ruby: Server-Side Request Forgery (GLSA 202003-09)
Severity: high
Exploitable: remote
Date: 2020-03-14
Bug(s): #698464
ID: 202003-09

Synopsis

A vulnerability in OpenID library for Ruby at worst might allow an
attacker to bypass authentication.


Background

A Ruby library for verifying and serving OpenID identities.

Affected Packages

Package: dev-ruby/ruby-openid
Vulnerable: < 2.9.2
Unaffected: >= 2.9.2
Architectures: All supported architectures


Description

It was discovered that OpenID library for Ruby performed discovery
first, and then verification.


Impact

A remote attacker could possibly change the URL used for discovery and
trick the server into connecting to the URL. This server in turn could be
a private server not
publicly accessible.
In addition, if the client that uses this library discloses connection
errors, this in turn could disclose information from the private server
to the attacker.


Workaround

There is no known workaround at this time.

Resolution

All ruby-openid users should upgrade to the latest version: