Multiple format string vulnerabilities in the parse_error_msg function in parsehelp.c in dpkg before 1.17.22 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via format string specifiers in the (1) package or (2) architecture name.
https://exchange.xforce.ibmcloud.com/vulnerabilities/98551
http://seclists.org/oss-sec/2014/q4/622
http://seclists.org/oss-sec/2014/q4/551
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157387.html