[Full-disclosure] Cosign SSO Authentication Bypass

2007-04-11T00:00:00
ID SECURITYVULNS:DOC:16656
Type securityvulns
Reporter Securityvulns
Modified 2007-04-11T00:00:00

Description

Author: Jon Oberheide <jon@oberheide.org> Date: Wed, April 11th, 2007

Summary

Application: Cosign Single Sign-On Affected Versions: 2.0.1 and previous Vendor Website: http://weblogin.org Type of Vulnerability: Authentication Bypass - Remote

Background

cosign is a web single-sign-on system. Written at the University of Michigan, cosign is an open source software project and a part of the National Science Foundation Middleware Initiative (NMI) EDIT software release. cosign is deployed extensively at the University of Michigan and at educational institutions and other organizations around the world.

Description

Two critical remote vulnerabilities exist within the CGI component of cosign allowing authentication bypass and impersonation of an arbitrary user. The full details of each vulnerability can be found at the following links:

http://www.umich.edu/~umweb/software/cosign/cosign-vuln-2007-001.txt http://www.umich.edu/~umweb/software/cosign/cosign-vuln-2007-002.txt

Resolution

Organizations utilizing cosign should upgrade to versions 1.9.4b or 2.0.2a available at http://weblogin.org.

-- Jon Oberheide <jon@oberheide.org> GnuPG Key: 1024D/F47C17FE Fingerprint: B716 DA66 8173 6EDD 28F6 F184 5842 1C89 F47C 17FE