The buf.pl script before 2.20 in Irssi before 0.8.20 uses weak permissions for the scrollbuffer dump file created between upgrades, which might allow local users to obtain sensitive information from private chat conversations by reading the file.
www.openwall.com/lists/oss-security/2016/09/24/1
www.openwall.com/lists/oss-security/2016/09/26/4
www.securityfocus.com/bid/93155
github.com/irssi/scripts.irssi.org/commit/f1b1eb154baa684fad5d65bf4dff79c8ded8b65a
irssi.org/security/buf_pl_sa_2016.txt
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7OM3WHWQ7RIAOZSOZZUM4CUYGKSIAGJJ/