The Common UNIX Printing System (CUPS) provides a portable printing layer for UNIX(R) operating systems.
When processing a request, the CUPS scheduler would use case-sensitive matching on the queue name to decide which authorization policy should be used. However, queue names are not case-sensitive. An unauthorized user could print to a password-protected queue without needing a password. The Common Vulnerabilities and Exposures project has assigned the name CAN-2005-2154 to this issue.
Please note that the version of CUPS included in Red Hat Enterprise Linux 4 is not vulnerable to this issue.
All users of CUPS should upgrade to these erratum packages which contain a backported patch to correct this issue.