lppasswd in CUPS 1.1.22 ignores write errors when modifying the CUPS passwd file, which allows local users to corrupt the file by filling the associated file system and triggering the write errors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10398
https://exchange.xforce.ibmcloud.com/vulnerabilities/18606
http://www.redhat.com/support/errata/RHSA-2005-053.html
http://www.redhat.com/support/errata/RHSA-2005-013.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:008