cpio on FreeBSD 2.1.0, Debian GNU/Linux 3.0, and possibly other operating systems, uses a 0 umask when creating files using the -O (archive) or -F options, which creates the files with mode 0666 and allows local users to read or overwrite those files.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10888
https://exchange.xforce.ibmcloud.com/vulnerabilities/19167
http://www.trustix.org/errata/2005/0003/
http://www.redhat.com/support/errata/RHSA-2005-806.html
http://www.redhat.com/support/errata/RHSA-2005-080.html
http://www.redhat.com/support/errata/RHSA-2005-073.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:032
http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/1391
http://www.debian.org/security/2005/dsa-664
http://support.avaya.com/elmodocs2/security/ASA-2005-212.pdf
http://secunia.com/advisories/17532
http://secunia.com/advisories/17063