A simple truss command reveals that xscreensaver opens your DISPLAY with
an euid of 0:
15560: execve("/usr/openwin/bin/xscreensaver", 0xFFBFEF3C, 0xFFBFEF44) argc =
1
15560: *** SUID: ruid/euid/suid = 21782 / 0 / 0 ***
15560: access("/home/casper/.Xauthority", R_OK) = 0
15560: open("/home/casper/.Xauthority", O_RDONLY) = 4
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: getuid() = 21782 [0]
15560: seteuid(21782) = 0
Casper
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