A flaw was found in Sinatra when serving static files from the public directory. The requested path is not validated if it is in the public directory, allowing files outside of the public directory to be served.

Jenkins Chef Sinatra Plugin 1.20 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

A missing permission check in Jenkins Chef Sinatra Plugin 1.20 and earlier allows attackers with Overall/Read permission to have Jenkins send an HTTP request to an attacker-controlled URL and have it parse an XML response.

A cross-site request forgery (CSRF) vulnerability in Jenkins Chef Sinatra Plugin 1.20 and earlier allows attackers to have Jenkins send an HTTP request to an attacker-controlled URL and have it parse an XML response.

A missing permission check in Jenkins Chef Sinatra Plugin in the ChefBuilderConfiguration.DescriptorImpl#doTestConnection form validation method allows attackers with Overall/Read permission to initiate a connection to an attacker-specified server.

A cross-site request forgery vulnerability in Jenkins Chef Sinatra Plugin in the ChefBuilderConfiguration.DescriptorImpl#doTestConnection form validation method allows attackers to initiate a connection to an attacker-specified server.

It was found that Sinatra is vulnerable to an XSS via the 400 Bad Request page that occurs upon a params parser exception.

Upstream issue:

https://github.com/sinatra/sinatra/issues/1428

Introduced by:

https://github.com/sinatra/sinatra/commit/8f8df53ff29938ace79b31097c27d9cdac803b44

Upstream patch:

https://github.com/sinatra/sinatra/commit/12786867d6faaceaec62c7c2cb5b0e2dc074d71a