The web interface in chumby one before 1.0.4 and chumby classic before 1.7.2 allows remote attackers to execute arbitrary commands via shell metacharacters in a request.
Improper Neutralization of Special Elements used in an OS Command The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component.