Simple Single Sign On <= 4.1.0 - Authentication Bypass

2022-08-0900:00:00

Lana Codes

133

single sign on

authentication bypass

oauth server

client secret code

exploit script

0.002 Low

EPSS

Percentile

59.8%

JSON

The plugin leaks its OAuth client_secret, which could be used by attackers to gain unauthorized access to the site.

When we click the "Single Sign On" button, the plugin redirects us to the OAuth server to authenticate ourselves if we are not logged in.

The button invokes the following URL:
https://lana.solutions/vdb/oauth-client/?auth=sso

The client plugin redirects us to the following URL:
https://lana.solutions/vdb/oauth-server/?oauth=authorize&response_type=code&client_id=A7h8AfabvPH462WLGbcD6Ljb8IOE2tR9uDJva2TW&client_secret=ufMq5A63dGKOxW335SXyQKCNcumxZ2ZILnFk1Mil&redirect_uri=https%3A%2F%2Flana.solutions%2Fvdb%2Foauth-client%2F%3Fauth%3Dsso&state=https%3A%2F%2Flana.solutions%2Fvdb%2Foauth-client

The URL contains the "client_secret" code that can be used to request an access token with client credentials grant type authentication.

Exploit script: https://gist.github.com/lana-codes/7659650c13b38b66b43748809b0c3269