Matthias Hopf reports:
By crafting hostnames with shell escape characters, arbitrary commands can be executed in a root environment when a display manager reads in the resource database via xrdb.
These specially crafted hostnames can occur in two environments:
Systems are affected are: systems set their hostname via DHCP, and the used DHCP client allows setting of hostnames with illegal characters. And systems that allow remote logins via xdmcp.
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