RubySec

Providing security resources for the Ruby community

CVE-2021-23435 (clearance): Open Redirect in clearance

ADVISORIES

GEM

clearance

SEVERITY

CVSS v3: 7.6 (High)

PATCHED VERSIONS

  • >= 2.5.0

DESCRIPTION

This affects the package clearance before 2.5.0. The vulnerability can be possible when users are able to set the value of session[:return_to]. If the value used for return_to contains multiple leading slashes (/////example.com) the user ends up being redirected to the external domain that comes after the slashes (http://example.com).