etc-update in Portage before 2.1.3.11 on Gentoo Linux relies on the umask to set permissions for the merge file, often resulting in permissions weaker than those of the original files, which might allow local users to obtain sensitive information by reading the merge file.
bugs.gentoo.org/show_bug.cgi?id=193589
osvdb.org/42636
secunia.com/advisories/28094
sources.gentoo.org/viewcvs.py/portage?rev=7799&view=rev
www.gentoo.org/security/en/glsa/glsa-200712-11.xml
www.securityfocus.com/bid/26864
www.securitytracker.com/id?1019097
exchange.xforce.ibmcloud.com/vulnerabilities/39035