sys/sys_unix.c in the ioQuake3 engine on Unix and Linux, as used in World of Padman 1.5.x before 1.5.1.1 and OpenArena 0.8.x-15 and 0.8.x-16, allows remote game servers to execute arbitrary commands via shell metacharacters in a long fs_game variable.
https://security.gentoo.org/glsa/201706-23
https://exchange.xforce.ibmcloud.com/vulnerabilities/68869
http://www.securityfocus.com/bid/48915
http://www.securityfocus.com/archive/1/519051/100/0/threaded
http://worldofpadman.com/website/news/en/article/266/wop-1-5-1-1-hotfix-released-for-linux.html
http://thilo.tjps.eu/download/patches/ioq3-svn-r2097.diff
http://svn.icculus.org/quake3?view=rev&revision=2097
http://securityreason.com/securityalert/8324
http://secunia.com/advisories/45468
http://secunia.com/advisories/45417
http://lists.fedoraproject.org/pipermail/package-announce/2011-August/063460.html