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.
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.