Format string vulnerability in pic utility in groff 1.16.1 and other versions, and jgroff before 1.15, allows remote attackers to bypass the -S option and execute arbitrary commands via format string specifiers in the plot command.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6918
http://www.securityfocus.com/archive/1/199706
http://www.redhat.com/support/errata/RHSA-2002-004.html
http://www.debian.org/security/2002/dsa-107
http://www.debian.org/security/2001/dsa-072
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000428